Background. There are several case reports of chondrolysis following joint arthroscopy. Continuous post-operative infusion of local anaesthetic solutions, especially 0.5% Bupivacaine, has been implicated as the causative factor in many of these cases. Recent in vitro studies have shown that even a single exposure of articular cartilage to different local anaesthetic solutions can cause apoptosis and mitochondrial dysfunction in chondrocytes leading to cell death. There is currently no study looking at methods to prevent this toxicity of local anaesthetic solutions to articular cartilage. Glucosamine has a protective and reparative effect on articular cartilage and a Cochrane review in 2007 found that it provides mild benefit in pain and function in patients with arthritis. Aims. Oncologic: To compare the effect of a single exposure, in vitro, of different local anaesthetic solutions on human articular cartilage. To investigate the protective and reparative effects of Glucosamine on articular cartilage exposed to 0.5% Bupivacaine. Methods. Chondral explants (n = 354) were obtained from femoral heads of 14 fracture neck of patients undergoing hemiarthroplasty. To compare the effect of local anaesthetics, each specimen was exposed to one of 8 test solutions for one hour. After this exposure, the specimens were washed and incubated in culture medium containing radio-labelled 35-sulphur for 16 hours. The unbound radioactivity was then washed off and the chondral specimens were digested with proteinase for 24 hours. The uptake of 35-S by each specimen was measured and this gave an estimate of proteoglycan metabolism. Test solutions: 1. 1% Lidocaine; 2. 2% Lidocaine; 3. 0.25% Bupivacaine; 4. 0.5% Bupivacaine,. 5. 0.5% Levo-Bupivacaine; 6. Control solution of M199 culture medium. 7. To investigate its protective effect, 100 micrograms of Glucosamine was added along with 0.5% Bupivacaine; 8. To investigate the reparative effect of Glucosamine, the specimen was exposed to 0.5% Bupivacaine for one hour. After washing, 100 mcg of Glucosamine was added to the culture medium in which the chondral specimen was incubated. Results. Compared to the control culture medium, the inhibition of proteoglycan metabolism was 54% with 1% Lidocaine (p<0.001), 75% with 2% Lidocaine (p<0.01), 50% with 0.25% Bupivacaine (p = 0.04), 78% with 0.5% Bupivacaine (p<0.001) and 73% with 0.5% Levo-Bupivacaine (p<0.001). Adding Glucosamine for protection reduced the toxicity of 0.5% Bupivacaine to 43%, compared to 78% without. However, Glucosamine was not able to repair the damage caused by 0.5% Bupivacaine, with inhibition of proteoglycan metabolism at 70% even after 16 hours of incubation. Conclusion. All local anaesthetic solutions tested were toxic to articular cartilage, 0.5% Bupivacaine being the worst offender. Higher concentrations were more harmful. The addition of Glucosamine to 0.5% Bupivacaine protected against its toxicity to articular cartilage but was not able to repair the damage caused

Our unpublished data has indicated that the perivascular stem cells (PSCs) have increased chondrogenic potential compared to mesenchymal stem cells (MSCs) derived in culture. There has been a recent change in the theory that stem cells work by a paracrine effect rather than differentiation. There are minimal data demonstrating the persistence of implanted stem cells when used for engraftment. This study aimed to develop an autologous large animal model for perivascular stem cells as well as to determine if cells were retained in the articular cartilage defects. The reactivity of anti-human and anti-ovine antibodies was ascertained using immunohistochemistry and fluorescence-activated cell sorting (FACS). A panel of antibodies were combined and used to identify and purify pericytes (CD34-CD45-CD146+) and adventitial cells (CD34+CD45-CD146-) using FACS. The purified cells were cultured and their identity checked using FACS. These cultured cells demonstrated osteogenic, adipogenic and chondrogenic potential. Autologous ovine PSCs (oPSCs) were isolated, cultured and transfected using a GFP virus. The transfection rate was 88%. The cells were implanted into an articular cartilage defect on the medial femoral condyle using a hydrogel, four weeks following implantation the condyle was explanted and confocal laser scanning microscopy demonstrated the presence of oPSCs in the defect. Histology did not demonstrate any repair tissue at this early time point. These data have confirmed the viability our large animal model and that the implanted stem cells were retained in the defect four weeks following implantation

As arthroplasty demand grows worldwide, the need for a novel cost-effective treatment option for articular cartilage (AC) defects tailored to individual patients has never been greater. 3D bioprinting can deposit patient cells and other biomaterials in user-defined patterns to build tissue constructs from the “bottom-up,” potentially offering a new treatment for AC defects. Novel composite bioinks were created by mixing different ratios of methacrylated alginate (AlgMA) with methacrylated gelatin (GelMA) and collagen. Chondrocytes and mesenchymal stem cells (MSCs) were then encapsulated in the bioinks and 3D bioprinted using a custom-built extrusion bioprinter. UV and double-ionic (BaCl2 and CaCl2) crosslinking was deployed following bioprinting to strengthen bioink stability in culture. Chondrocyte and MSC spheroids were also bioprinted to accelerate cell growth and development of ECM in bioprinted constructs. Excellent viability of chondrocytes and MSCs was seen following bioprinting (>95%) and maintained in culture, with accelerated cell growth seen with inclusion of cell spheroids in bioinks (p<0.05). Bioprinted 10mm diameter constructs maintained shape in culture over 28 days, whilst construct degradation rates and mechanical properties were improved with addition of AlgMA (p<0.05). Composite bioinks were also injected into in vitro osteochondral defects and crosslinked in situ, with maintained cell viability and repair of osteochondral defects seen over a 14-day period. In conclusion, we developed novel composite bioinks that can be triple-crosslinked, facilitating successful chondrocyte and MSC growth in 3D bioprinted scaffolds and in vitro repair of an osteochondral defect model. This offers hope for a new approach to treating AC defects

Articular cartilage has very poor repair potential, however it has an extraordinary capacity to withstand physiological mechanical loads in an intact joint. The nature and extent of chondrocyte death in articular cartilage following many forms of injury (trephine, scalpel, osteotome, sutures and drilling) has been characterised, but the ability to bear mechanical injury from iatrogenic surgical interventions is still unknown. A standard arthroscopic probe was moved at varying physiological pressures along the articular cartilage of joint before staining with fluorescent dyes to allow live/dead cell imaging using laser confocal scanning microscopy and imaging software, Image J. Bovine metatarsal phalangeal joints and fresh human cadaveric femoral condyles were used. The probe caused statistically significant chondrocyte death in bovine cartilage (p=0.02). Mild pressure 5% cell death, moderate (standard arthroscopic technique pressure) 22% and severe pressure 38%. A similar result was seen in human tissue with 24% cell death at moderate pressure compared to a control (p=0.0699). The widely assumed benign arthroscopic probe produces significant cell death in articular cartilage when used at standard operating pressures

Aims

Occult (clinical) injuries represent 15% of all scaphoid fractures, posing significant challenges to the clinician. MRI has been suggested as the gold standard for diagnosis, but remains expensive, time-consuming, and is in high demand. Conventional management with immobilization and serial radiography typically results in multiple follow-up attendances to clinic, radiation exposure, and delays return to work. Suboptimal management can result in significant disability and, frequently, litigation.

Aims

The purpose of this study was to develop a convolutional neural network (CNN) for fracture detection, classification, and identification of greater tuberosity displacement ≥ 1 cm, neck-shaft angle (NSA) ≤ 100°, shaft translation, and articular fracture involvement, on plain radiographs.

Introduction. Anterior knee pain is a common presentation of patello-femoral dysfunction and patients with this disorder represent a significant proportion attending a specialist knee clinic. There is an on-going debate as to the cause and best treatment for such patients. Previous studies on patella-femoral morphology have suggested patella maltracking plays an important part in the aetiology but there had been no studies correlating maltracking with articular cartilage change. Methods. We studied 147 consecutive patients (294 knees) aged between 10 and 63 presenting with anterior knee pain. All underwent MRI tracking scan of their knees as part of the routine investigations. We analysed the prevalence of maltracking with respect to gender, laterality and age groups, as well as patello-femoral articular cartilage changes. Results. 52% of patients were found to have maltracking, of which 75% were bilateral. Furthermore, 66% of patients with maltracking had radiological evidence of patellar articular cartilage changes, corresponding to 61% of 294 knees examined. While majority of these occur at lateral facet, a proportion of medial facet changes (16%) is also seen. More significantly, while 25% of knees from patients with maltracking under the age of 20 are found to have changes on the patella cartilage, this increases to 93% by the age of 50 or above, with step-wise increment per decade of age (p<0.01). Conclusion. Our results demonstrate a strong correlation between anterior knee pain symptoms, patella maltracking and changes in patello-femoral joint cartilages of varying severity. This has implications on the management of these patients and would suggest early correction of maltracking is indicated to prevent deterioration in the patello-femoral joint

Periprosthetic osteolysis depends on the biological activity of wear particles, but there is little known about the distribution of polyethylene wear particles (PE) in the surrounding joint tissue. The purpose of this study was to examine the localisation of wear particles of six different PEs, including four crosslinked polyethylenes (XPE), as well as their biological activity in the murine knee. Material and Methods. Wear particles of 4 XPE- and 2 UHMWPE-inserts were isolated (knee joint simulator). For all groups the particles were similar in size and shape (mean diameter 0.3–05μm; 20nm-nucleopore-filter; ISO; n = 100.000).56 female Balb/c mice were randomly assigned to six treatment groups and one control group: control (PBS), XPE1 (3×30 kGy Gamma, annealed/sequential irradiated), XPE2 (95 kGy E-beam, remelted), XPE3 (65 kGy E-beam, remelted), XPE 4 (50 kGy Gamma, remelted), UHMWPE 1, UHMWPE 2. 50 μl of each particle suspension [(0.1% vol/vol (particle volume/PBS volume) after removal of endotoxin] were injected into the left knee joint. After 1 week the mice were killed and a histological and immunhistochemical analysis of the knee joints was done (IL-1, TNF-, ICAM-1). For the immunhistochemistry the articular cartilage, the bone marrow and the synovial membrane were evaluated semiquantitatively (Kruskal-Wallis test; all pairwise multiple comparison procedure; Bonferoni correction; significance level: p<0.05). Results. All groups showed a thickened synovial layer with an increased cellular infiltration. The particles of XPE 1 and 2 were localised in the bone marrow as well as in the joint space. In contrast, the particles of XPE 3 and 4 were distributed in the synovial layer and in the bone marrow as well, but not in the joint space. The UHMWPE1 particles were mainly located in the bone marrow and joint space while the UHMWPE2 particles were mainly found in the bone marrow and the synovial layer. For all PE groups there was a higher cytokine expression compaired to control (p<0.0024) without any differences between the groups (bone marrow/synovial layer). The chondrocytes in the groups with XPE 1- and XPE 2-particles expressed more TNF- than in the control group and the other treatment groups (p = 0.000). Conclusion. XPEs lead to a similar inflammatory reaction in vivo compared to conventional polyethylenes. The high TNF- expression in the articular cartilage (groups XPE 1 and 2) might be explained by the localisation of the wear particles in the joint space in direct contact with the chondrocytes. Long-term studies are necessary to analyse the effects of different wear particle distributions in the joint surrounding tissue after knee and hip replacement. Furthermore it has to be investigated, whether their distribution in the joint space or their transport into the bone marrow is responsible for the level of the chronic inflammatory reaction

After a severe ankle sprain the incidence of residual complaints, particularly on the medial side of the joint, is high. We studied a consecutive series of 30 patients who had operative repair of acute ruptures of lateral ligaments. During operation, arthroscopy revealed a fresh injury to the articular cartilage in 20 ankles, in 19 at the tip and/or anterior distal part of the medial malleolus as well as on the opposite medial facet of the talus. In six patients, a loose piece of articular cartilage was found. We conclude that in patients with a rupture of one or more of the lateral ankle ligaments after an inversion injury, an impingement occurs between the medial malleolus and the medial facet of the talus. Patients with a lesion of the lateral ankle ligament caused by a high-velocity injury (a faulty landing during jumping or running) had a higher incidence of macroscopic cartilage damage (p < 0.01), medially-located pressure pain (p = 0.06) and medially-located complaints at one-year follow-up (p = 0.02) than those with a low-velocity injury (a stumble)

Background. The mechanical disadvantage and detrimental effect to articular cartilage following meniscectomy has been well documented in the literature. Meniscal repair in the avascular (white on white zone) is controversial and would be deemed inappropriate by many. Methods. Prospective data collection on all meniscal repairs between 1999 and 2008. 423 patients underwent meniscal repair at our unit during this time. We identified 88 patients who underwent a meniscal repair of a non peripheral tear (white on white zone) where there was no co-existent ACL injury or instability. There were 74 males and 14 females with a mean age of 26 years (13-54). There were 50 medial meniscal tears and 38 lateral tears, all in the non peripheral area of the meniscus. The criterion for failure was any reoperation on the same meniscus requiring excision or re fixation. Results. The mean follow up was 44 months (5–106). Twenty nine patients required further surgery on their repaired meniscus. There were nine re-repairs and twenty partial menisectomies. Of the nine re-repairs only one has gone on to have a further procedure with meniscectomy. This represents a success rate of 67% (59/88). The mean pre-operative Lysholm score was 61 (4-88) which rose to 75 (12-100) postoperatively, (p=0.002). The mean pre-operative Tegner score was 6 (3-10) and this did not change significantly post operatively, mean 6 (0-10) (p=0.4). Conclusions. Isolated white on white avascular meniscal tears can be successfully repaired in the majority of cases with a good clinical and functional result

Introduction. Femoroacetabular impingement (FAI) is a relatively recent recognised condition and a potential cause of anterior hip pain in the young military adult population. Both Cam and Pincer type FAI may lead to inflammation, labral tears, and or damage to the smooth articular cartilage of the acetabulum leading potentially to early osteoarthritis of the hip. Open Surgical hip dislocation using the Ganz Trochanteric Flip approach is an accepted technique allowing osteoplasty of the femoral neck and acetabular rim combined with labral repair if required. We present our results of this technique used in military personnel. Methods. All Military personnel who underwent FAI surgery in our unit since August 2006 were included in the study. Functional outcome was measured using the Oxford hip and McCarthy non-arthritic hip scores pre and post-operatively. Results: 13 hips in 11 patients with an average age of 36 years (21–45) underwent surgical hip dislocation for treatment of FAI. Average time of downgrading prior to surgery was 9.3(3-18) months. 6 out of the 11 patients have been upgraded to P2. Average time to upgrading was 6.8(3-17) months. There were no infections, dislocations, or neurovascular complications. Mean Oxford Hip Score improved from 22.8(range 8–38) to 39.5(11–48) and mean McCarthy hip score from 49.6(33.75–80) to 79.2(36.25–100) with an average follow up of 19.4 months (range 4– 42 months). Discussion. The early results of surgical hip dislocation in military personnel are encouraging. Long-term follow-up is required to see if this technique prevents the natural progression to osteoarthritis

Chondral injuries of the knee are extremely common and present a unique therapeutic challenge due to the poor intrinsic healing of articular cartilage. These injuries can lead to significant functional impairment. There are several treatment modalities for articular osteochondral defects, one of which is autologous chondrocyte implantation. Our study evaluates the mid to long term functional outcomes in a cohort of 828 patients who have undergone an autologous chondrocyte implantation procedure (either ACI or MACI), identifying retrospectively factors that may influence their outcome. The influence of factors including age, sex, presence of osteoarthritis and size and site of lesion have been assessed individually and with multivariate analysis. All patients were assessed using the Bentley Functional Score, Visual Analogue Score and the Cincinnati Functional Score. Assessment were performed pre-operatively and of their status in 2010. The majority of patients had several interim scores performed at varying intervals. The longest follow-up was 12 years (range 24 to 153 months) with a mean age of 34 years at time of procedure. The mean defect size was 486 mm2 (range 64 to 2075 mm2). The distribution of lesions was 51% Medial Femoral Condyle, 12.5% Lateral Femoral Condyle, 18% Patella (single facet), 5% Patella (Multifacet) and 6% Trochlea. 4% had cartilage transplant to multiple sites. 30% failed following this procedure at a mean time of 72 months. 52% patients stated a marked improvement in their functional outcomes within the first two years. 49% stated an excellent result following their procedure. High failure rate was noted in those with previous cartilage regenerative procedures, transplants occurring on the patella, particularly if involving multifacets. Multiple site cartilage transplantation was also associated with a high failure rate. Autologous chondrocyte implantation is an effective method of decreasing pain and increasing function, however patient selection plays clear role in the success of such procedure

Introduction. Numerous types of graft can be used for revision of anterior cruciate ligament (ACL) reconstruction. The goal of our studies was to analyze mid term outcomes of revision of anterior cruciate ligament reconstructions conducted by means of ipsilateral bone -patellar tendon -bone (B-PT-B) transplant. Materials and methods. We conducted a retrospective study on a consecutive series of 44 patients. All patients were operated on by the same senior surgeon in our institution between 2003 and 2009. All patients had undergone a first ACL reconstruction with B-PT-B transplant. They all had ACL revision under arthroscopic assistance and by means of ipsilateral B-PT-B transplant after a minimum of 18 months after primary surgery. At time of ACL revision, the mean patients age was 28 years (range, 17–49 years). The average postoperative follow up after revision was 55 months (range, 12–88 months). We had no patient lost to follow up. All patients were evaluated by an independent observer using IKDC scoring system and KT 2000. Results. The postoperative IKDC score averaged 78.2 (range, 41,4–97,7). 10 patients (22.7%) had their knee graded A, 25 patients (56.8%) grade B, 8 patients (18.2%) grade C and one patient (2.3%) grade D. The post operative maxi manual differential KT 2000 averaged 1,52 mm (range, −1mm/12mm). The identified aetiologies for poor clinical outcomes were menisectomy in the first ACL reconstruction (p<0.01) and articular cartilage lesions (ICRS grade III and IV) found during ACL revision. In most cases, return to sport activities was achieved but not at the same level. We had no specific complication after second harvesting of the patellar tendon. Discussion. The type of graft used in revision of ACL reconstructions is a controversy. In the literature, many studies reported the results of revision of ACL reconstructions but with poor methodology and few data for every type of graft. In our study, we found clinical results comparable to those classically reported in the literature. Clinical evaluation showed good control of the laxity and no specific patellar tendon complication. Conclusion. The clinical results of revision of ACL reconstructions is lower than in primary surgery. We did not noticed specific patellar tendon complication after second harvesting of BPTB transplant. The revision of ACL reconstruction with ipsilateral BPTB transplant showed good clinical results and good control of the anteroposterior laxity

Objective. To provide a best estimate of the average treatment effect when microfracture was chosen as the intervention of choice in patients with full-thickness cartilage defects of the knee. Design. We focussed on controlled studies which either referred to microfracture alone or in comparison with any other surgical treatment of articular cartilage of the knee. Papers including patients who had been treated by microfracture and concomitant adjuvant procedures like ACL reconstruction or meniscus repair were accepted too, whereas papers reporting on the microfracture technique combined with the implantation of a scaffold were excluded. To achieve a best estimate of the average, to be expected treatment effect we pooled pooled before–after data of study arms using microfracture. Because cartilage studies employ various scales to measure functional improvements, we standardized treatment effects using Hedges' g. To provide clinically meaningful estimates we converted the pooled summary effect back into the respective scales by multiplying the pooled effect with pooled standard deviations of each included clinical scale. Results. A systematic review of the literature revealed six papers including 200 patients with a mean age of 32 years, a mean defect size of 3 cm. 2. and a follow up period from 2 to 5 years. Four of the studies compared microfracture to autologous chondrocyte implantation and two of them to osteochondral autologous transplantation. All patients were treated by the microfracture technique as described by Steadman and by a similar rehabilitation protocol which only allowed crutch-assisted touchdown weight bearing initially. Referring to the individual studies, a comparison of the pooled estimates of Hedges' g revealed that the two papers which evaluated the youngest patients provided the highest treatment effect. On the contrary, those two papers which focussed on the largest lesions, reported the worst improvement. Finally, the remaining two papers whose patients were characterized by similar age and defect size presented comparable results. The individual standardized effect sizes were combined into an overall best estimate. Its value was 1.678, measured in units of standard deviation, with the 95% confidence interval of [1.016; 2.340] resulting in different values of the average, to be expected treatment effect when it is measured in Lysholm Score (22.1), IKDC Score (26.5) and KOOS (15.2) points. Conclusions. Our results offer a clinically intuitive estimation of the average treatment effects on common clinical scales. Compared to the preoperative situation, a significant clinical improvement can be expected for each patient. Nevertheless, the magnitudes of these treatment effects are an approximation and must be interpreted cautiously. Furthermore, we did not succeed to confirm that young age and small lesion size have a beneficial effect on the clinical outcome

Introduction. treatment of femoral neck fractures in the physically active elderly, is still an open question. The comparison of total replacement and partial hip replacement showed substantial superiority of the first approach than the latter. We can not disregard the problems that THR can lead in the elderly: more surgical time, greater blood loss, major sacrifice of bone in osteoporotic subjects. The Tribofit® acetabular system, has the objective to overcome these problems with the implantation of a single 3mm soft, pliable buffer made of polycarbonate-urethane between the large diameter metal femoral head and the subchondral bone, thus replacing the articular cartilage. The surgical technique includes the reaming of the cartilage layer, the creation of a circumferential groove and the snap-fit insertion of the buffer. The purpose of the prospective study was to evaluate the effectiveness of this approach in the treatment of femoral neck fractures in the elderly. Materials and Methods. from September 2008 to July 2010 we performed 45 implants with the Tribofit® Acetabular Buffer (Active Implants®, Memphis TN, USA). The inclusion criteria for the study were: femoral neck fracture patients over 75 years of age, physically independent before the injury, with good life expectancy, mild or absent arthritis, absence of morphological alterations of the acetabulum. The average age of these patients was 81,2 (75–89), the sex distribution was 36 females and 9 males, with 22 fractures of the left hip and 23 of the right. In all cases an uncemented straight femoral stem was implanted. We recorded per-operative blood loss and intra-per-operative problems encountered. Follow-up were performed at 1, 3, 6 and 12 months post-op with radiographic control and clinical examination. The clinical outcome was objectively measured by the Harris Hip Score, pain Visual Analogue Scale and SF-36 questionnaire. Results. Of the 45 patients, 4 died of unrelated causes and 3 were lost to follow-up (2 due to cognitive impairment and 1 due to peri-prosthetic fracture of the femur). Of the 38 available for follow-up, all were followed at the staged time. No intra-operative problems were registered. The mean HHS for these fractures patients was 74,2 at 6 months and 86 at 12 months (90–80 good; 80–70 fair). The mean pain VAS was 4,3 at 6 months and 2 at 12 months. The mean SF-36 Score was 52,3 at 6 months and 53,2 at 12 months. Of the 38 followed, we had 2 dislocations in the third week post-op while the two patients were in a rehabilitation centre. Open reduction was carried out and in both cases the buffer was not dislodged. Discussion and conclusions. we believe the results with this new type of prosthesis are encouraging and comparable to if not better than other prosthetic options in the literature for this difficult-to-treat patient population

INTRODUCTION. Studies have suggested that there is a reduction in head-neck-ratio (HNR) associated with MoMHRA. A reduction in HNR at operation would decrease range of movement and increase impingement risk. Impingement could lead to 20 edge loading, increasing wear. Serum ion levels of Chromium (Cr) and Cobalt (Co) are surrogate markers of wear. Although acetabular component orientation has been shown to contribute to wear and PT development, the role of a decrease in HNR has only been highlighted in PT development. This study aimed to measure changes in HNR that occur at resurfacing and determine any gender- and component size-specific differences. In addition it aimed to determine whether changes in HNR could be associated with increased wear. METHODS. 84 patients (56M: 28F) with unilateral MoMHRA were included. The mean age at surgery was 57 years. The mean femoral component was 49mm. Components were considered small if <45mm, average if between 45–50mm and large if >50mm. Three designs were implanted; BHR, C+ and Recap. The average follow up was 4 years. All patients had Cr/Co levels measured at follow up. Patients were considered to have high ions if Cr and Co levels were 5.1ppb and 4.4ppb respectively. Pre-operative HNR (HNRpre) and the post-operative HNR (HNRpost) were made from the respective pelvic radiographs. Assuming a 2mm thick cartilage layer, the HNR based on the diameter of the articular cartilage pre-operatively (HNRart) was calculated. The immediate changes in HNR as a result of the operation were expressed relative to articular HNR pre-op:. HNRartpost=HNRpost–HNRart. RESULTS. The changes in HNR at operation were significantly negatively correlated with HNRpre, (p<0.001), (rho=−0.77). Females had greater ion levels (p=0.013) and smaller components (p<0.001). Females had bigger pre-operative HNRart and were downsized more (p<0.001). Similarly, patients with small components had higher ions (p=0.032). They had greater HNRart and were downsized more (p<0.001) Twelve patients comprised the high ion group. These patients had smaller components (p=0.004), greater HNRart and were down-sized significantly more at resurfacing (p<0.001). DISCUSSION. This study highlights HNR changes that occur in resurfaced hips. Females, patients with small components and patients in the high ion group had higher pre-operative HNR and were downsized more at operation. Femoral downsize, would probably increase impingement risk, lead to secondary edge loading and contribute to greater incidence of wear related problems

INTRODUCTION. The purpose of this study is to report results from a prospective multicenter study of a bioresorbable type I collagen scaffold used to replace tissue loss following irreparable lateral meniscus injuries. METHODS. 49 non-consecutive patients (33M/16F; mean age 30.5 yrs, range 14.7–54.7 yrs) with irreparable lateral meniscus tears or loss requiring surgical treatment were prospectively enrolled at one of 7 EU centers. 11 patients (22%) had acute injuries of the lateral meniscus, while 38 (78%) had prior surgeries to the involved meniscus. Implantation of the LCMI (now Lateral Menaflex) was performed arthroscopically using an all-inside suturing technique (FASTFIX) combined with inside-out sutures in the more anterior meniscus aspect. Forty-three patients were evaluated with a 2 to 4-year follow-up (FU); mean FU duration was 45 months (range, 33–53 m). Patients were evaluated clinically and by self-assessment using Tegner activity and Lysholm function scores, as well as the Visual Analog Scales (VAS) for pain, and a satisfaction questionnaire. Evaluations were performed pre-operatively, 6 months, 1 year, 2 and 4 years after surgery. X-ray and/or MR-images were taken pre-operatively, and at 1 year and 2 years after surgery. RESULTS. At 3 months after surgery, all patients were able to return to activities of daily living without limitation. Post-op. mean values of all evaluated patients showed statistically significant improvement compared to the preoperative scores. Mean Tegner scores increased from 3.0 to 5.2 at 4 years (0.8 points less than the pre-injury “recall” value); mean Lysholm improved from 63 to 91; mean pain (VAS) decreased from 36 to 8. At the 4-year time point, 86% of the patients stated that they were satisfied with their results (compared to 78% at the one year FU time point). Function and pain scores improved continuously with the highest score at the latest FU evaluation. All data were statistically significant (p<0.001, except for Tegner with p=0.03). MRI examination revealed no changes to the articular cartilage and joint space; however, the newly formed tissue did not present a signal consistent with fully mature native meniscus tissue. Reoperations were necessary in 5 patients (10%) during the FU time period: 3 of the reoperations were for persistent swelling and pain, which were classified as related to the device (6%) and were treated by synovectomy and debridement. Patients recovered without sequelae. The re-op. rate in this series is comparable to re-op. rates reported after lateral meniscal repair. DISCUSSION. Based on available results with a minimum 2 year FU, 90% of the patients benefited from the Lateral Menaflex as evidenced by improved clinical outcomes associated with gains in activity and function. Longer-term FU continues to determine the extent and duration of the benefits observed

Aims

The aim of this study was to compare the incidence of anterior knee pain after antegrade tibial nailing using suprapatellar and infrapatellar surgical approaches

Aims

The aims of this study were to determine the cumulative ten-year survivorship of hips treated for acetabular fractures using surgical hip dislocation and to identify factors predictive of an unfavourable outcome.

Aims

The treatment of late presenting fractures of the lateral humeral condyle in children remains controversial.