Abstract. Background. Dislocation of a hip hemiarthroplasty is a devastating complication with a high mortality rate in elderly patients. Previous studies have suggested a higher dislocation rate in patients with neuromuscular conditions. In this study, we have reviewed our larger cohort of patients to identify whether there is any association between neuromuscular disorders and prosthetic dislocation in patients treated with hip hemiarthroplasty for femoral neck fractures. Patients and Methods. Our study is a retrospective analysis of data collected over 34 years for patients with intracapsular neck of femur fracture who underwent hip hemiarthroplasty. The study population is composed of four groups: patients with no neuromuscular disorders, patients with Parkinson's disease, patients with previous stroke, and patients with dementia. Results. A total of 3827 patients were treated with hip hemiarthroplasty. For the 3371 patients with no neuromuscular condition (Group I) the dislocation rate was 1.1%. 219 patients had Parkinsonism (Group II) with a dislocation rate of 3.2%, 104 patients had a previous stroke with weakness on the fracture side with a dislocation rate of 1.0% (Group III), and 984 patients had severe dementia with a dislocation rate of 1.8% (Group IV). The increased dislocation rate for those with Parkinson's disease was statistically significant (p=0.02) while none of the other neuromuscular conditions were statistically significant. Conclusion. Our study demonstrates an increased risk of dislocation after hemiarthroplasty for patients with Parkinson's disease in comparison to other groups. No increase was apparent for those with dementia or weakness from a previous stroke

Background. Hip Hemiarthroplasty is one of the commonest orthopaedic operation done in UK with recent NHFD data from 2017 report showing that 43% of the 77000 patients who presented to hospital had hemiarthroplasty. Literature suggests dislocation rate of 0.8% – 6.1% for Hip Hemiarthroplasty. Dislocation of hemiarthroplasty may lead to significant morbidity and mortality. Aim. To investigate if acetabular dysplasia has a significant association with hemiarthroplasty dislocation. Methodology. Retrospective multicentre review. Review of radiographs of patients receiving a hip hemiarthroplasty for a hip fracture measuring Acetabular index (sharp angle) and Lateral Centre edge angle(CEA). A large acetabular index and lower value for the center-edge angle suggest acetabular dysplasia. Measurements were made for 20 patients with dislocation and 20 patients without dislocation. Statistical assessment of the results with unpaired t test was performed. Results. Mean acetabular angle for those with dislocation was 42.65 degrees versus 37.8 for those without dislocation giving a p value of 0.000861. Mean Center-edge angle of those with dislocation was 26.1 degrees versus 37 for those without dislocation giving a p value of 0.000019. Conclusion. This study showed that the hemiarthroplasty dislocation group had higher acetabular index and Lower Center-edge angle compared to the hemiarthroplasty group without dislocation clearly demonstrating that acetabular dysplasia is implicated in the aetiology of hip hemiarthroplasty dislocation. Hence careful review of the pre-op X-rays for dysplastic features would benefit in making a sound management plan

Gram-negative prosthetic joint infections (GN-PJI) present unique challenges in management due to their distinct pathogenesis of biofilm formation on implant surfaces. To date, there are no animal models that can fully recapitulate how a biofilm is challenged in vivo in the setting of GN-PJI. The purpose of this study is to establish a clinically representative GN-PJI in vivo model that can reliably depict biofilm formation on titanium implant surface. We hypothesized that the biofilm formation on the implant surface would affect the ability of the implant to be osseointegrated. The model was developed using a 3D-printed, medical-grade titanium (Ti-6Al-4V), monoblock, cementless hemiarthroplasty hip implant. This implant was used to replace the femoral head of a Sprague-Dawley rat using a posterior surgical approach. To induce PJI, two bioluminescent Pseudomonas aeruginosa (PA) strains were utilized: a reference strain (PA14-lux) and a mutant strain that is defective in biofilm formation (DflgK-lux). PJI development and biofilm formation was quantitatively assessed in vivo using the in vivo imaging system (IVIS), and in vitro using the viable colony count of the bacterial load on implant surface. Magnetic Resonance Imaging (MRI) was acquired to assess the involvement of periprosthetic tissue in vivo, and the field emission scanning electron microscopy (FE-SEM) of the explanted implants was used to visualize the biofilm formation at the bone-implant interface. The implant stability, as an outcome, was directly assessed by quantifying the osseointegration using microCT scans of the extracted femurs with retained implants in vitro, and indirectly assessed by identifying the gait pattern changes using DigiGaitTM system in vivo. A localized prosthetic infection was reliably established within the hip joint and was followed by IVIS in real-time. There was a quantitative and qualitative difference in the bacterial load and biofilm formation between PA14 and DflgK. This difference in the ability to persist in the model between the two strains was reflected on the gait pattern and implant osseointegration. We developed a novel uncemented hip hemiarthroplasty GN-PJI rat model. This model is clinically representative since animals can bear weight on the implant. PJI was detected by various modalities. In addition, biofilm formation correlated with implant function and stability. In conclusion, the proposed in vivo GN-PJI model will allow for more reliable testing of novel biofilm-targeting therapetics

Introduction. Gram-negative prosthetic joint infections (GN-PJI) present unique challenges in management due to their distinct pathogenesis of biofilm formation on implant surfaces. The purpose of this study is to establish a clinically representative GN-PJI model that can reliably recapitulate biofilm formation on titanium implant surface in vivo. We hypothesized that biofilm formation on an implant surface will affect its ability to osseointegrate. Methods. The model was developed using 3D-printed titanium hip implants, to replace the femoral head of male Sprague-Dawley rats. GN-PJI was induced using two bioluminescent Pseudomonas aeruginosa strains: a reference strain (PA14-lux) and a mutant biofilm-defective strain (ΔflgK-lux). Infection was monitored in real-time using the in vivo imaging system (IVIS) and Magnetic Resonance Imaging (MRI). Bacterial loads on implant surface and in periprosthetic tissues were quantified utilizing viable-colony-count. Field-emission scanning-electron-microscopy of the explanted implants was used to visualize the biofilm formation at the bone-implant-interface. The implant stability, as an outcome, was directly assessed by quantifying the osseointegration in vitro using microCT scan, and indirectly assessed by identifying the gait pattern changes using DigiGait. TM. system in vivo. Results. Localized infection was established within the hip joint and was followed by IVIS in real-time. There was a quantitative and qualitative difference in the bacterial load and biofilm formation between PA14-lux and ΔflgK-lux. This difference in the ability to persist in the model between the two strains was reflected in the gait pattern and implant osseointegration. Conclusions. We developed a novel uncemented hip hemiarthroplasty, GN-PJI rat model. To date, the proposed in vivo biofilm-based model is the most clinically representative for GN-PJI since animals can bear weight on the implant and poor osseointegration correlates with biofilm formation. In addition, localized PJI was detected by various modalities. Clinical Relevance. The proposed in vivo GN-PJI model will allow for more reliable testing of novel biofilm-targeting therapeutics

Introduction. The hip hemiarthroplasty in posterior approach is a common surgical procedure at the femoral neck fractures in the elderly patients. However, the postoperative hip precautions to avoid the risk of dislocations are impeditive for early recovery after surgery. We used MIS posterior approach lately known as conjoined tendon preserving posterior (CPP) approach, considering its enhancement of joint stability, and examined the intraoperative and postoperative complications, retrospectively. Methods. We performed hip hemiarthroplasty using CPP approach in 30 patients, and hip hemiarthroplasty using conventional posterior approach in 30 patients, and both group using lateral position with the conventional posterior skin incision. The conjoined tendon (periformis, obturator internus, and superior/inferior gemellus tendon) was preserved and the obturator externus tendon was incised in CPP approach without any hip precautions postoperatively. The conjoined tendon was incised in conventional approach using hip abduction pillow postoperatively. Results. There was no difference between CPP approach group and conventional approach group in the mean age of patients (81.8 years, and 80.3 years, respectively), and in the mean operative time (68.8 minutes, and 64.9 minutes, respectively). In 4 cases of CPP approach, the avulsion fracture at femoral attachment of the conjoined tendon occured during hip reduction manoeuvres. No dislocations occured in both groups in the follow-up period (2 years). Discussion. Lately, the number of hip surgery in muscle sparing approach is increasing. However, in general, MIS approach induces the intraoperative complications, and requires the skillful procedure. The hip reduction manoeuvres would be more difficult in the CPP approach, than in conventional posterior approach, because the preserved conjoined tendon would inhibit hip reduction, considering those avulsion fractures of the femoral attachment. Nevertheless, CPP approach did not require no extended time compared to conventional approach, and no postoperative hip precautions. Due to these results, CPP approach could be a good MIS procedure including early recovery after surgery based on the enhancement of joint stability, excluding the difficulties in hip reduction manoeuvres. We could not show the difference in dislocation rate between two groups, because of small numbers. We are planning to increase the number of patients in the future study

Prosthetic joint infections (PJI) are devastating complications. Our knowledge on hip fractureassociated hemiarthroplasty PJI (HHA-PJI) is limited compared to elective arthroplasty. The goal of this study was to describe the epidemiology, risk factors, management, and outcomes for HHA-PJI. A population-based (465,000) multicentre retrospective analysis of HHAs between 2006-2018 was conducted. PJI was defined by international consensus and treatment success as no return to theatre and survival to 90 days after the initial surgical management of the infection. Univariate, survival and competing risk regression analyses were performed. 1852 HHAs were identified (74% female; age:84±7yrs;90-day-mortality:16.7%). Forty-three (2.3%) patients developed PJI [77±10yrs; 56% female; 90-day-mortality: 20.9%, Hazard-Ratio 1.6 95%CI 1.1-2.3,p=0.023]. The incidence of HHA-PJI was 0.77/100,000/year and 193/100,000/year for HHA. The median time to PJI was 26 (IQR 20-97) days with 53% polymicrobial growth and 41% multi-drug resistant organisms (MDRO). Competing risk regression identified younger age [Sub-Hazard-Ratio(SHR) 0.86, 95%CI 0.8-0.92,p<0.001], chronic kidney disease (SHR 3.41 95%CI 1.36-8.56, p=0.01), body mass index>35 (SHR 6.81, 95%CI 2.25-20.65, p<0.001), urinary tract infection (SHR 1.89, 95%CI 1.02-3.5, p=0.04) and dementia (SHR 9.4, 95%CI 2.89-30.58,p<0.001) as significant risk factors for developing HHA-PJI. When infection treatment was successful (n=15, 38%), median survival was 1632 days (IQR 829-2084), as opposed to 215 days (IQR 20-1245) in those who failed, with a 90-day mortality of 30%(n=12). There was no significant difference in success among debridement, excision arthroplasty or revision arthroplasty. HHA PJI is uncommon but highly lethal. All currently identified predictors are non-modifiable. Due to the common polymicrobial and MDRO infections our standard antibiotic prophylaxis may not be adequate HHA-PJI is a different disease compared to elective PJI with distinct epidemiology, pathogens, risk factors and outcomes, which require targeted research specific to this unique population

Introduction. Premature cessation of clopidogrel in certain patients with cardiac conditions is associated with an increased risk of recurrent coronary events. Such patients often present with proximal femoral fractures requiring surgical intervention. Our aim was to ascertain whether it is necessary to stop clopidogrel preoperatively to avoid postoperative complications following hip hemiarthroplasty surgery. Methods. A retrospective review of 102 patients with ongoing clopidogrel therapy and patients not on clopidogrel who underwent hip hemiarthroplasty for an intracapsular proximal femoral fracture was undertaken. Statistical comparison on pre- and postoperative haemoglobin (Hb), ASA grades, comorbidities, operative times, transfusion requirements, hospital length of stay (LOS), wound infection, haematoma and reoperation rates between the two groups was undertaken. Results. There were 50 patients in the clopidogrel group (CG) and 52 in the non-clopidogrel group (NCG). The mean age was 83 years. There was no difference with respect to ASA grade, comorbidities (except cardiac comorbidities), age, gender and operation times between the two groups. The mean preoperative Hb was 12.5 g/dl and 12.6 g/dl respectively in the CG and NCG (p=0.72). The mean postoperative Hb was 10.8 g/dl and 11.1 g/dl respectively in the CG and NCG (p= 0.37). 4 and 2 patients respectively required transfusions postoperatively in the CG and NCG (p= 0.37). A total of 8 and 5 units were utilised in the CG and NCG groups respectively (p= 0.54). There was no difference with respect to LOS, wound infection, haematoma and reoperation rates between the two groups postoperatively. Conclusion. Maintaining clopidogrel therapy throughout the perioperative period in high risk patients with intracapsular proximal femoral fractures is not associated with an increased risk of bleeding or complications following hip hemiarthroplasty surgery

Aim. To review the outcome of deep prosthetic infection in patients following hip hemiarthroplasty surgery. Method. A retrospective case-note analysis was performed of deep infection coded hip hemiarthroplasty patients between 2004–2009. Patients were selected when there was proven microbiology from deep wound swabs or tissue specimens. Results. Deep infection developed in 14 of 1428 hemiarthroplasties. The mean age at time of fracture was 83 (71–93). There was a 12:2 female to male ratio. Eleven of the 14 cases had an American Society of Anaesthesiologists (ASA) score of three or four. Eight infections were due to Staphylococcus aureus, of which 6 were due to MRSA, which accounted for 43% of infections overall. There was no significant correlation between pathogen and success of treatment. Eight of the 14 hips were treated with open debridement and washout with implant retention. This was successful in 4 hips (50%). Infection recurred in 4 hips, one of which was revised to total hip replacement. The remaining 3 hips with recurrent infection were treated with excision arthroplasty. Three of the 14 hips were treated initially with excision arthroplasty. One required a further debridement and another required 3 debridements to control infection following implant removal. In 2 hips, a single stage revision to total hip replacement was performed. One of these developed recurrent infection, which was treated successfully with open debridement and washout. In one hip, no further surgery was performed. The 90-day mortality for patients with infected hemiarthroplasty was 36%. Conclusion. Deep infection following hemiarthroplasty of the hip has serious consequences and high mortality at 90 days. In our study sample, recurrence of infection was common and at least half required multiple operations. This study highlights the importance of infection prevention to reduce the morbidity and mortality following hip fracture surgery

Introduction. Geometric variations of the hip joint can give rise to abnormal joint loading causing increased stress on the articular cartilage, which may ultimately lead to degenerative joint disease. In-vitro simulations of total hip replacements (THRs) have been widely reported in the literature, however, investigations exploring the tribology of two contacting cartilage surfaces, and cartilage against metal surfaces using complete hip joint models are less well reported. The aim of this study was to develop an in-vitro simulation system for investigating and comparing the tribology of complete natural hip joints and hemiarthroplasties with THR tribology. The simulation system was used to assess natural porcine hip joints and porcine hemiarthroplasty hip joints. Mean friction factor was used as the primary outcome measure to make between-group comparisons, and comparisons with previously published tribological studies. Method. In-vitro simulations were conducted on harvested porcine tissue. A method was developed enabling natural acetabula to be orientated with varying angles of version and inclination, and natural femoral heads to be potted centrally with different orientations in all three planes. Acetabula were potted with 45° of inclination and in the complete joint studies, natural femoral heads were anatomically matched and aligned (n=5). Hemiarthroplasty studies (n=5) were conducted using cobalt chrome (CoCr) heads mounted on a spigot (Figure 1), size-matched to the natural head. Natural tissue was fixed using PMMA (polymethyl methacrylate) bone cement. A pendulum friction simulator (Simulator Solutions, UK), with a dynamic loading regime of 25–800N, ± 15° flexion-extension (FE) at 1 Hertz was used. The lubricant was a 25% (v/v) bovine serum. Axial loading and motion was applied through the femoral head and frictional torque was measured using a piezoelectric transducer, from which the friction factor was calculated. Results. The correct anatomical orientation and positioning was achieved enabling in-vitro simulation testing to be conducted on hemiarthroplasty and complete hip joint samples for two-hours. Mean friction increased rapidly followed by a continued gradual increase to ≈0.03 ± 0.00 in the complete joints, with the hemiarthroplasty group plateauing at ≈0.05 ± 0.01 (Figure 2). Mean friction factor was significantly lower (t-test; p < 0.05) in the complete natural joint group. Discussion. An in-vitro simulation system for the natural hip joint with controlled orientation of the femur and acetabulum was successfully developed and used to measure friction in complete porcine hip joints and porcine hip hemiarthroplasties. A non-linear increase in friction indicative of biphasic lubrication was observed in both groups with slower exudation of fluid from the complete joints compared to the hemiarthroplasties, inferring a quicker move towards solid-phase lubrication. Higher friction in the hemiarthroplasties, which was similar to that measured in-vitro in metal-on-polyethylene THRs, was most likely due to variable clearances between the non-conforming spherical metal head and aspherical acetabulum, causing poorer congruity and distribution of the load. This could in time lead to abrasive wear and cartilage degradation. This methodology could have an important role when investigating associations between hip geometric variations, interventions for hip disease/pathology, and risk factors for cartilage degeneration

Aim. The incidence of fractured neck of femur (FNOF) is increasing yearly. Many of these patients undergo hip hemiarthroplasty. High dose dual-antibiotic cement (HDDAC) has been shown to reduce rates of deep surgical site infection (SSI) when compared to the current standard low dose single-antibiotic cement (LDSAC) in a quasi-randomised controlled trial. Some concerns exist regarding the use of HDDAC and the development of resistance. We reviewed cases of infection in LDSAC and HDDAC bone cement with regard to causative organism and resistance profile. Method. A retrospective analysis was undertaken of all hemiarthroplasties within our trust from April 2008 to December 2014. We identified all patients in this time period who acquired a deep SSI from the trust SSI surveillance database. The infecting organisms and susceptibility patterns were collated for each cement. Results. We identified 1941 hemiarthroplasties. There were 36 deep surgical site infections representing an infection rate of 3.1% in LDSAC patients and 1.2% in HDDAC patients. A wider variety of organisms were seen in the LDSAC compared to HDDAC. Staphylococcus epidermidis accounted for the majority of infections in both LDSAC and HDDAC patients. Infection with Corynebacterium species and Staphylococcus aureus was eliminated completely in HDDAC. There was minimal change in the proportion of Gram-negative and Gram-positive bacteria. A change in resistance was not demonstrated amongst infections caused by Gram-negative bacteria. In Gram-positive bacteria, resistance to a number of antibiotics increased using HDDAC compared to LDSAC, most notably to clindamycin and gentamicin within the coagulase negative staphylococci. However, levels of resistance remained low to teicoplanin, vancomycin, daptomycin, linezolid and rifampicin. Conclusions. A lower infection rate was seen in HDDAC. Direct comparison demonstrated changes in resistance profiles caused by Gram-positive organisms. 24,000 patients undergo hip hemiarthroplasty annually. Extrapolating our results to this cohort would demonstrate 744 infections in LDSAC and 288 infections in HDDAC. Of these, resistance to both clindamycin and gentamicin would be seen in 180 patients with LDSAC and 177 patients with HDDAC. Overall, this review supports the continued use of HDDAC in FNOF patients. High dose dual antibiotic cement = Copal G+C, Heraeus Medical, UK. Low dose single antibiotic cement = Palacos R+G, Heraeus Medical, UK

The objective of this study is to compare three dimensional (3D) postoperative motion between metal and ceramic bipolar hip hemiarthroplasty for femoral neck fracture. Materials and Methods. This study was conducted with forty cases (20 cases of metal bipolar hemiarthroplasty (4 males, 16 females), 20 cases of ceramic bipolar hemiarthroplasty (2 males, 18 females)) from November 2012 to November 2014. Average age was 80.8±7.5 years for the metal bipolar group and 79.3±10.5 years for the ceramic bipolar group. We obtained motion pictures from standing position to maximum abduction in flexion by fluoroscopy then analyzed by 2D–3D image matching method. The motion range of the “Shell angle”, “Stem neck angle” and the “Stem neck and shell angle” has been compared between the metal bipolar group and the ceramic bipolar group (Fig. 1). Results. Metal bipolar showed greater variability of the Stem neck angle and Shell angle than ceramic bipolar. Six of the twenty cases reached unilateral oscillation angle of 37 degrees in metal bipolar. In other words, 30% of metal bipolar group revealed neck-shell impingement. No case reached oscillation angle of 58 degrees in ceramic bipolar group. There was no significant difference between the metal bipolar group and the ceramic bipolar group with respect to the difference of minimum and maximum angle of Stem neck angle (movement range of the stem neck) and Shell angle (movement range of the bipolar cup). On the other hand, difference of minimum and maximum angle of the Stem neck and shell angle (movement range of the inner head) was significantly greater in the metal bipolar group than the ceramic bipolar group. Movement, range of bipolar shell was significantly greater than that of inner head in both groups (Table 1). Discussion. The present study is the first report using 2D–3D image matching method in bipolar impingement. From the result of our study, bipolar shell moves greatly against the acetabular cartilage for both metal bipolar and ceramic bipolar, and the range of movement of the outer shell was significantly greater than the range of movement of the inner head. It indicates that most of the movement actually occurs between outer shell and acetabular cartilage, despite bipolar prosthesis having a double bearing function intrinsic to the design. Impingement between the shell and the stem neck was found six of twenty cases with metal bipolar group and no impingement occurred with ceramic bipolar group. The present results showed that the ceramic bipolar has the possibility to avoid the characteristic complications of the bipolar caused by the wear debris produced by impingement. In conclusion, the metal bipolar group's inner head's range of movement was greater than the ceramic bipolar group. The impingement between stem neck and shell occurred in the 30% of metal group patients. On the other hand, there were no impingement cases for the ceramic bipolar group. We expect good long term clinical result and expansion of the indication as the ceramic bipolar may reduce the typical bipolar related complication

Acute postoperative periprosthetic joint infection (PJI) is a serious complication after any hemiarthroplasty (HHA) implanted due to a proximal hip fracture. The growing number of chronic institutionalized geriatric patients (CIGP) colonized with multi-drug resistant bacteria (e.g.: MRSA), not covered by usual antibiotic prophylaxis, has been identified as a risk factor for PJI after HHA. We therefore sought to compare the HHA infection characteristics between non-institutionalized patients (NIP) with proximal hip fractures and CIGP. We investigate (1) the rate of compliance with a new proposed protocol, (2) the acute infection rate, 3) the microbiologic characteristics of the infection, and 4) the success of the new protocol.

We gathered clinical, operative and infection data on all patients who underwent HHA due to a proximal femoral fracture in our center, during a 3-year period. We focus in the cases of acute postoperative infection (Zimmerli´s criteria). The new proposed antibiotic prophylaxis is cefazolin except in CIGP in which co-trimoxazole is used.

During the study period a total of 385 HHA in 385 patients were performed. In all cases the HHA was performed after a proximal femoral fracture. Overall, 109 patients (28,2%) were CIGP. We found an acute postoperative PJI in 21 out 385 HHA procedures, that is, a global acute infection rate of 5.43%. Ten out 109 (9.17%) CIGP patients resulted infected compared to 11 out 278 (3.9%) non-institutionalized patients (p: 0.049). One or more causative microorganisms were identified in 20/21 (95%) of PJI. Globally the Gram-Negative bacilli group accounted for the majority of the infections (60%). Staphylococus aureus was isolated in 3 cases (8.6%) with only a single MRSA infection. The percentage of polymicrobial infections was 47% (10 out of 21). Co-trimoxazole was used in the prophylaxis in 80.1% of the CIGP. In the infected cases a non-effective drug against the microorganism was used in the prophylaxis in 17 (81%) of the acute infected HHA.

We confirm that institutionalized patients are more prone to acute infections after a HHA. Our current strategy of antibiotic prophylaxis has showed to be effective in preventing MRSA PJI in CIGP. However, we found an increased rate of infection due to gram-negative bacilli non-covered by the current antibiotic prophylaxis. According our data an extended antibiotic prophylaxis on gram-negative drug will be proposed to be implemented in CIGP scheduled to a HHA because a proximal femoral fracture.

Recent registry data from around the world has strongly suggested that using cemented hip hemiarthroplasty has lower revision rates compared to cementless hip hemiarthroplasty for acute femoral neck hip fractures. The adoption of using cemented hemiarthroplasty for hip fracture has been slow as many surgeons continue to use uncemented stems. One of the reasons is that surgeons feel more comfortable with uncemented hemiarthroplasty as they have used it routinely. The purpose of this study is to compare the difference in revision rates of cemented and cementless hemiarthroplasty and stratify the risk by surgeon experience. By using a surgeons annual volume of Total Hip Replacements performed as an indicator for surgeon experience. The Canadian Joint Replacement Registry Database was used to collect and compare the outcomes to report on the revision rates based on surgeon volume. This is a large Canadian Registry Study where 68447 patients were identified for having a hip hemiarthroplasty from 2012-2020. This is a retrospective cohort study, identifying patients that had cementless or cemented hip hemiarthroplasty. The surgeons who performed the procedures were linked to the procedure Total Hip Replacement. Individuals were categorized as experienced hip surgeons or not based on whether they performed 50 hip replacements a year. Identifying high volume surgeon (>50 cases/year) and low volume (<50 cases/year) surgeons. Hazard ratios adjusted for age and sex were performed for risk of revision over this 8-year span. A p-value <0.05 was deemed significant. For high volume surgeons, cementless fixation had a higher revision risk than cemented fixation, HR 1.29 (1.05-1.56), p=0.017. This pattern was similar for low volume surgeons, with cementless fixation having a higher revision risk than cemented fixation, HR 1.37 (1.11-1.70) p=0.004 We could not detect a difference in revision risk for cemented fixation between low volume and high volume surgeons; at 0-1.5 years the HR was 0.96 (0.72-1.28) p=0.786, and at 1.5+ years the HR was 1.61 (0.83-3.11) p=0.159. Similarly, we could not detect a difference in revision risk for cementless fixation between low volume and high volume surgeons, HR 1.11 (0.96-1.29) p=0.161. Using large registry data, cemented hip hemiarthroplasty has a significant lower revision rate than the use of cementless stems even when surgeons are stratified to high and low volume. Low volume surgeons who use uncemented prostheses have the highest rate of revision. The low volume hip surgeon who cements has a lower revision rate than the high volume cementless surgeon. The results of this study should help to guide surgeons that no matter the level of experience, using a cemented hip hemiarthroplasty for acute femoral neck fracture is the safest option. That high volume surgeons who perform cementless hemiarthroplasty are not immune to having revisions due to their technique. Increased training and education should be offered to surgeons to improve comfort when using this technique

Recent registry data from around the world has strongly suggested that using cemented hip hemiarthroplasty has lower revision rates compared to cementless hip hemiarthroplasty for acute femoral neck hip fractures. The adoption of using cemented hemiarthroplasty for hip fracture has been slow as many surgeons continue to use uncemented stems. One of the reasons is that surgeons feel more comfortable with uncemented hemiarthroplasty as they have used it routinely. The purpose of this study is to compare the difference in revision rates of cemented and cementless hemiarthroplasty and stratify the risk by surgeon experience. By using a surgeons annual volume of Total Hip Replacements performed as an indicator for surgeon experience. The Canadian Joint Replacement Registry Database was used to collect and compare the outcomes to report on the revision rates based on surgeon volume. This is a large Canadian Registry Study where 68447 patients were identified for having a hip hemiarthroplasty from 2012-2020. This is a retrospective cohort study, identifying patients that had cementless or cemented hip hemiarthroplasty. The surgeons who performed the procedures were linked to the procedure Total Hip Replacement. Individuals were categorized as experienced hip surgeons or not based on whether they performed 50 hip replacements a year. Identifying high volume surgeon (>50 cases/year) and low volume (<50 cases/year) surgeons. Hazard ratios adjusted for age and sex were performed for risk of revision over this 8-year span. A p-value <0.05 was deemed significant. For high volume surgeons, cementless fixation had a higher revision risk than cemented fixation, HR 1.29 (1.05-1.56), p=0.017. This pattern was similar for low volume surgeons, with cementless fixation having a higher revision risk than cemented fixation, HR 1.37 (1.11-1.70) p=0.004 We could not detect a difference in revision risk for cemented fixation between low volume and high volume surgeons; at 0-1.5 years the HR was 0.96 (0.72-1.28) p=0.786, and at 1.5+ years the HR was 1.61 (0.83-3.11) p=0.159. Similarly, we could not detect a difference in revision risk for cementless fixation between low volume and high volume surgeons, HR 1.11 (0.96-1.29) p=0.161. Using large registry data, cemented hip hemiarthroplasty has a significant lower revision rate than the use of cementless stems even when surgeons are stratified to high and low volume. Low volume surgeons who use uncemented prostheses have the highest rate of revision. The low volume hip surgeon who cements has a lower revision rate than the high volume cementless surgeon. The results of this study should help to guide surgeons that no matter the level of experience, using a cemented hip hemiarthroplasty for acute femoral neck fracture is the safest option. That high volume surgeons who perform cementless hemiarthroplasty are not immune to having revisions due to their technique. Increased training and education should be offered to surgeons to improve comfort when using this technique

Purpose

The optimal treatment of displaced femoral neck fractures in patients over 60 years is controversial. While much research has focused on the impact of total hip arthroplasty (THA) and hemiarthroplasty (HA) on surgical outcomes, little is known about patient preferences for either alternative. The purpose of this study was to elicit surgical preferences of patients at risk of sustaining hip fracture using a novel Decision board.

Routine postoperative radiographs following hip hemiarthroplasty are commonly undertaken despite it being suggested that they can cause delays to discharge, discomfort to patients and unnecessary radiation. Our study considered the necessity of these post-operative radiographs. A retrospective search was conducted of all hemiarthroplasty procedures on the Royal Cornwall Hospital database. These were reviewed for cases where re-operation was conducted within 6 weeks. Notes and post-operative check radiographs of those who underwent re-operation were reviewed to determine how essential radiographs were in diagnosing complications requiring re-operations. A total of 1557 hemiarthroplasty operations were identified. There were 37 incidences of re-operation within 6 weeks. 29 cases had normal check radiographs. 8 dislocations were picked up on post-operative radiographs. In all but one of these cases, clinical suspicion of complication had been raised prior to the radiograph. In the remaining case documentation was poor and no firm conclusion as to clinical suspicion could be drawn. Our review of over 1500 hemiarthroplasty cases, demonstrated one incident where the check radiograph solely diagnosed an abnormality needing intervention that might not have been apparent clinically. We thus suggest that check radiographs following hip hemiarthroplasty should not be routinely ordered for all patients

Introduction. Cemented hemiarthroplasty for neck of femur fractures has been advocated over uncemented hemiarthroplasty due to better post-operative recovery and patient satisfaction. However, studies have shown adverse effects of bone cement on the cardio-respiratory system which may lead to higher morbidity and mortality. Therefore, in some institutes, the use of an uncemented prosthesis has been adopted for patients with a high number of co-morbidities. The aim was to compare early mortality rates for cemented vs. uncemented hemiarthroplasties. Method. Cohort study of displaced intracapsular hip fractures treated with hemiarthroplasty between 1999–2009 at one institute. A total of 3094 hemiarthroplasties performed; out of which 1002(32.4%) were cemented and 2092(67.6%) were uncemented. 48hour and 30day mortality rates for the two groups were compared and a multivariate Cox regression model used to eliminate confounding factors. Significant confounding factor included age, sex, mini mental test score, medical co-morbidities, Nottingham Hip Fracture Score and delay to surgery. Results. The study showed that, after eliminating confounding factors, 48hour mortality in the cemented group was 0.3% compared to 0.5% in the uncemented group (p=0.388). However, the adjusted 30day mortality rate for the cemented group (4%) was shown to be significantly lower than for the uncemented group (10.8%) (p< 0.001). Conclusion. The use of cement in hip hemiarthroplasty is not associated with an increased rate of mortality at 48hours or at 30days. Along with emerging evidence of better post-op recovery and patient satisfaction with the use of a cemented prosthesis, we support the use of cement for all patients undergoing hip hemiarthroplasty

The cement in cement technique for revision total hip arthroplasty (THA) has shown good results in selected cases. However, results of its use in the revision of hemiarthroplasty to THA has not been previously reported. Between May 1994 and May 2007 28 (20 Thompson's and 8 Exeter bipolar) hip hemiarthroplasties were revised to THA in 28 patients using the cement in cement technique. All had an Exeter stem inserted at the time of revision. Clinical and operative data were collected prospectively. Clinical evaluation was by the Charnley, Harris and Oxford. Hip scores and radiographs were analysed post-operatively and at latest follow up. The mean age at time of hemiarthroplasty revision was 80 (35 to 93) years. The reason for revision was acetabular erosion in 12 (43%), recurrent dislocation in eight (29%), aseptic stem loosening in four (14%), periprosthetic fracture in two (7%) and infection in a further two (7%) patients. No patient has been lost to follow up. Three patients died within three months of surgery. The mean follow up of the remainder was 50 (16 to 119) months. Survivorship with revision of the femoral stem for aseptic loosening as the endpoint was 100%. Three cases (11%) have since undergone further revision, one for recurrent dislocation, one for infection, and one for periprosthetic fracture. The cement in cement technique can be successfully applied to revision of hip hemiarthroplasty to THA. It has a number of advantages in this elderly population including minimising bone loss, blood loss and operative time

Arthroplasty is a successfulsurgical procedure which provides returning daily activities by relieving pain, correcting deformity, and regaining the loss of ROM which is caused by many diseases such as degenerative arthritis when conservative and other surgical techniques fail to achieve. Successful outcomes depend on many variables at arthroplasty. Proper indication, careful selection of patient, adequate surgical technique and postoperative rehabilitation plays a major role. Despite successful outcomes achieved at arthroplasty, undesired complications can be frustrating for the patient and the surgeon. These complications can be minimized by careful preoperative planning, meticulous surgical procedure and rigorius postoperative care. Infection is the most frequent and most effective complication on outcomes after arthroplasty. Because of that, risk factors for infection must be researched carefully and minimized preoperatively. Antibiotic prophylaxis is routinely suggested before the surgery. Using routine irrigation as well as the standard surgical technique is effective for decreasing postoperative infection rates. Antibiotic impregenated cement is used especially at revision arthroplasties and should be used at primary surgery at high risk groups. In this study we evaluated 19 patients which admitted to Gulhane Military Academy of Medicine, Department of Orthopedics and Traumatology betwen 2007 and 2012. 5 patients had total hip arthroplasty (26.32%), 11 patients had total knee arthroplasty (57.89%) and 3 patients had hip hemiarthroplasty after femoral neck fractures. 14 of the patiens were female (73.68%) and 5 were (26,32%). Mean age was 69.74 (53–83). Primary surgery was held at our institution at 14 of the patients and 5 patients were referred from other instutitions because of their complaints.6 of the knees were right-sided and 5 of them was left-sided. 3 of the totap hips were left-sided and 2 of them was right-sided. 1 of the hip hemiarthroplasties were left-sided and 2 of them was right-sided. 42.11%of the patients were treated medically and 47.37%were treated with two staged surgery. 42.11%of the surgically treated group were healed completely and 5.26%of the patients passed away due to other comorbidities. Wound debridement was applied 10.53%of the patients which were admitted at early phase and resection arthroplasty was applied 5.26%of these patients because of the lack of response to medical and surgical debridement. With these results, patients with infected prosthesis can present with many different symptoms and infection risk must always be considered. It must be remembered that the onset time of infection is very important during diagnosis and treatment. Follow ups and treatment protocols must be standardized by clinics as algorithms. During the treatment the surgeon must be in close contact with infectious diseases and microbiology departments. Especially by new developing techniques during the recent years, spesific agents of the infection can be determined and spesific antibiotics can be used for the treatment

Aims

This study aimed to investigate the risk of postoperative complications in COVID-19-positive patients undergoing common orthopaedic procedures.