Dual mobility is a French concept that appeared in the 1970s and was initially intended to reduce dislocation rates. In recent years, this concept has evolved with new HA titanium spray coatings, new external macrostructures, and better-quality polyethylene. This has allowed to extend the indications to younger and therefore active populations. The objective of our work is to analyze at least 10 years a homogeneous and continuous series of 170 primary total hip replacements associating a latest generation Novae Sunfit. ®. dual mobility cup with a straight femoral stem. Only primary arthroplasties for osteoarthritis or necrosis were included. Total hip arthroplasty was always performed through a posterolateral approach. All patients had regular clinical and radiological follow-up. The average follow-up in our series was 11.5 years. The average age of the population is 71 years. At the last follow-up, there were 17 deaths, 6 losses to follow up and 9 adverse events, including 1 cup change for psoas impingement and 1 dislocation. The low rate of dislocation at 11 years confirms the high stability of the dual mobility, which should be recommended for primary procedure for patients at high risk of postoperative instability. The lack of intraprosthetic dislocation due to wear at 11 years of follow-up highlights the good quality of the latest generation of polyethylene, and the need to combine high-polished surfaces and a refined femoral neck with a dual mobility cup. Finally, the lack of aseptic loosening confirms the quality of the secondary fixation of these implants and justifies their wider use in all patients

Introduction. Prosthetic replacement remains the treatment of choice for displaced femoral neck fractures in the elderly population, with recent literature demonstrating significant functional benefits of total hip arthroplasty (THA) over hemiarthroplasty. Yet the fracture population also has historically high rates of early postoperative instability when treated with THA. The direct anterior approach (DAA) may offer the potential to decrease the risk of postoperative instability in this high-risk population by maintaining posterior anatomic structures. The addition of intraoperative fluoroscopy can improve precision in component placement and overcome limitations on preoperative planning due to poor preoperative radiographs performed in the emergency setting. Methods. We retrospectively reviewed clinical and radiographic outcomes of 113 consecutive patients with displaced femoral neck fractures treated by two surgeons over a five-year period. All underwent surgery via the DAA using fluoroscopic guidance, and were allowed immediate postoperative weight bearing without any hip precautions or restrictions. Charts were reviewed for relevant complications, while radiographs were reviewed for component positioning, sizing, and leg length discrepancy. Mean follow-up was 8.9 months. Results. Mean age was 79.3 years (range, 42 to 101), 73% of patients were women, and mean BMI was 22.6 kg/m. 2. Ninety patients (80%) received THA while 23 (20%) received unipolar or bipolar hemiarthroplasty. Mean acetabular anteversion was 15.0 degrees (range, 4 to 24) and mean abduction was 39.2 degrees (range, 27 to 51) with 95% of acetabular components in the combined safe zone as described by Lewinnek. Mean radiographic leg-length difference was +2.2 mm (range, −4.9 to +8.8mm). There was no femoral stem subsidence of more than 2mm. Only one patient (0.9%) dislocated postoperatively, who was eventually constrained for recurrent posterior instability 3 months following surgery. Delayed wound healing (6.1%) was the most common postoperative complication. Conclusions. The direct anterior approach allows a safe, effective, and reproducible approach for treatment of displaced femoral neck fractures, with very low rate of early postoperative instability compared to historical controls. The use of intraoperative fluoroscopy allows excellent component positioning, sizing, and restoration of leg length in spite of inconsistent preoperative radiographs

High failure rates have been associated with large diameter metal-on-metal total hip replacements (MoM THR). However there is limited literature describing the outcomes following the revision of MoM THR for adverse local tissue reaction (ALTR). A total of 98 large diameter MoM THRs underwent revision for ALTR at our institution. The data was obtained from the clinical records and included the demographics, intra-operative findings of ALTR and post-operative complications. Any subsequent procedures and re-revision for any reason was analysed in detail. The clinical outcome was measured using functional outcome scores using the Oxford hip score (OHS), Western Ontario and McMaster Universities osteo-arthritis index (WOMAC) score and Short Form (SF12). The mean age of the patients at the time of revision was 58.2 yrs. At a mean follow-up of 3.9 years (1.0 to 8.6) from revision for ALTR, there were 15 hips (15.3 %) with post-operative complications and 8 hips (8 %) requiring re-revision. The Kaplan–Meier five-year survival rate for ALTR revision was 91 % (95% confidence interval 78.9 to 98.0). There were no statistically significant predictors of re-revision. The rate of postoperative dislocation following revision was 9.2% (9 hips). The post-operative functional outcome depends on the intra-operative findings of tissue destruction secondary to ALTR. The short term results following revision of large diameter MoM THR for ALTR are comparable with other reports in the literature. The use of constrained liners reduces the incidence of post-operative dislocation. There is an increased risk of postoperative instability following revision THR for ALTR. Early identification and intervention seems to be the logical approach in the management of patients with ALTR

Insall, Laskin and others have taught us that the goal of successful total knee replacement (TKR) is to have well fixed and fitted components in a neutral mechanical axis (MA) with balanced soft tissues. Computer and robotic assisted (C-RAS) TKR with real time validation is an excellent tool to help you to attain these goals. Ritter and others have shown higher early failure rates with TKR's where the final alignment is outside a 3-degree window of the neutral MA. Dalury and Schroer have each shown higher early failure rates in TKR's with postoperative instability and or malalignment. C-RAS TKR helps prevent and significantly lowers the number of TKR outliers that may go on to early aseptic loosening and failure as compared with traditional methods. This featured video was created to show how surgeons can benefit from real-time validation and the kinematic data provided during C-RAS. The system helps in their intraoperative decision-making process and then guides them to make precise bone cuts and balance the soft tissue envelope in a very time efficient and highly repeatable fashion. Additionally, imageless C-RAS breaks away from the paradigm of pre-operative MRI or CT scan imaging studies by no longer requiring such costly procedures. This relatively easy, simple to learn, and cost-efficient procedure is a valuable asset in the operating room, for both the surgeon and patient. Furthermore, it is highly customizable and easily integrated into any surgeon's workflow, technique, and exposure. The viewer will learn the C-RAS TKR simple workflow of Tracking, Registration, Navigation, and Validation. The results of the previously published abstract “Influence of Pre-Operative Deformity on Surgical Accuracy and Time in Robotic-Assisted TKA” JA Koenig; C Plaskos; . BJJprocs.boneandjoint.org.uk. 95-B/SUPP28/62 2013, will also be presented at the end of the video. Finally many have argued that C-RAS TKR is an excellent method to teach the “ART of TKR” to young surgeons, residents and students as they can see with real time validation and data the immediate consequences and effects of their intra-operative actions and maneuvers

Objective. Computed tomography based three-dimensional surgical preoperative planning (3D-planning) has been expanded to achieve more precise placement of knee and hip arthroplasties. However, few reports have addressed the utility of 3D-planning for the total elbow arthroplasty (TEA). The purpose of this study was to assess the reliability and precision of 3D planning in unlinked TEA. Methods. Between April 2012 and April 2014, 17 joints in 17 patients (male 4, female 13) were included in this study. Sixteen patients were rheumatoid arthritis and one was osteoarthritis and the average age at the time of the procedure was 61 years (range 28–88). Unlinked K-NOW total elbow system (Teijin-Nakashima Medical. Co. Ltd.) was used in all cases and 3D planning was performed by Zed View (Lexi.Co.). After the appropriate size and position of the prosthesis were decided on the 3D images [Figure 1], the position of the bone tunnel made for the insertion of humeral and ulnar stem was recorded on axial, sagittal, and coronal plane (4 point measurements for humerus, and 6 points for ulna, See Figure 2). After the elbow was exposed via a posterior approach, bone resection and reaming was performed according to the 3D planning. The surgeon took an appropriate adjustment to align the prosthesis properly during the surgery. The final position of the stem insertion was recorded immediately prior to set the prostheses. We analyzed the accuracy of stem size prediction, the correlation between preoperative and final measurements, and postoperative complications. Results. The sizes of humeral stems and ulnar stems were estimated exactly in 70% (12/17) and 94 % (16/17) of all cases, respectively. All of the stem sizes were estimated accurately within one size. There was a strong correlation between the preoperative measurements around stem insertion and final position of the humerus with the correlation coefficient of 0.96–0.99, whereas the correlation was varied widely 0.48–0.97 for the ulna stem. The mean error in 3D orientation of the stem position was 0.56 mm for the humeral stem and 1.03 mm for the ulnar stem. There were no technical difficulties related to use of 3D-planning and the prostheses were properly placed in 16 cases, however posterior penetration of the ulnar stem occurred in 1 case. Conclusion. This study demonstrated the reliability and precision of preoperative 3D planning for unlinked TEA. Proper positioning of the prosthesis is extremely important to prevent maltracking and instability since postoperative instability has been a major complication of the unlinked TEA. This technique will potentially reduce the postoperative complications

Introduction. Selection of an optimum thickness of polyethylene insert in total knee arthroplasty (TKA) is important for the good stability and range of motion (ROM). The purpose of this study is to investigate the amount of change of ROM as the thickness of trial insert increase. Material and Method. The study included 86 patients with 115 knees undergoing TKA from October 2012 to February 2014. There were 17 men and 69 women with an average age of 75±8 (58–92) years. The implants posterior stabilized knee (Scorpio NRG, Stryker) was used and all prostheses were fixed with cement. The ROM was measured by the goniometer under the general anesthesia at the time of operation in increments of 1°. Preoperative flexion angle was measured by passively flexing the patient's hip 90 degrees and allowing the weight of the leg to flex the knee joint (Lee et al 1998). Extension angle was measured by holding the heel and raising the leg by another examiner. During TKA, flexion and extension angle was measured in a similar manner when each insert trial (8, 10, 12, and 15mm) was inserted. After the wound closure and removing the draping, ROM was measured again. Statistical analysis of range of motion was performed using a paired t-test to determine significance. Results. Preoperative extension angle was-11.8±7.5°and flexion angle was 125.4±14.9 °. postoperative extension angle after removing drapes was −5.0±3.4°and flexion angle was126.4±8.8°. Although extension angle was improved statistically (p<0.001), flexion angle was not improved. Intraoperative extension and flexion angle that were measured with the same thick insert trial as the polyethylene insert finally selected was −3.7±3.0°and 120.8±9.8°respectively. The thickness of polyethylene insert finally set was 8mm (28knees), 10mm (58knee), 12mm (24 knee), and 15mm (5knee). The amount of deficit in extension ROM by changing the trial inserts those were measured intraoperatively were 2.5±2.2° (n=112, 8 to 10mm, p<0.01), 3.2±2.8° (n=80, 10 to 12mm, p< 0.01), and 4.7±2.5° (n=15, 12 to 15mm, p<0.01). Flexion angle was 0.6±4.3° (8 to 10mm, n.s), 1.5±4.0° (10 to 12mm, p=0.002), 2.6±4.0° (12 to 15mm, p=0.025). Discussion. Although it is important to select a sufficient thick polyethylene insert to prevent postoperative instability, excessive thick polyethylene can decrease ROM especially extension. In many type of prosthesis, thickness of polyethylene insert differs every 2 mm is prepared. In the current study, if the thickness of polyethylene is increased 2mm (8 to10mm and 10 to 12mm) or 3mm (12 to15mm), extension and flexion angle was decreased 2.5–4.7°and 0.6–2.6°respectively

Background:. Dual mobility components in total hip arthroplasty have been successfully in use in Europe for greater than 25 years. However, these implants have only recently obtained FDA approval and acceptance among North American arthroplasty surgeons. Both decreased dislocation rate and decreased wear rates have been proposed benefits of dual mobility components. These components have been used for primary total hip arthroplasty in patients at high risk for dislocation, total hip arthroplasty in the setting of femoral neck fracture, revision for hip instability, and revision for large metal-on-metal (MoM) hip articulation. The literature for the North American experience is lacking. Purpose:. We report indications, short term outcomes, and complications of a series of subjects who received dual mobility outcomes at one institution. Study Design:. Consecutive subjects who received dual mobility total hip arthroplasty components from February 2010 and April 2013 were identified. Charts were retrospectively reviewed for surgical indications, comorbidities, component sizes, and perioperative complications including infection, dislocation, mechanical failure, and reoperation. Results:. 86 hips in 83 subjects underwent total hip arthroplasty or revision total hip arthroplasty using dual mobility components. There were 56 primary total hips and 30 revision total hips. Indications included small acetabular components in the setting of AVN (13 hips), DDH (12 hips) or severe inflammatory arthritis (5 hips), femoral neck fracture (5 hips), intraoperative instability (6 hips), recurrent postoperative instability (5 hips), and revision of large MoM articulations in the setting of failed hip resurfacing (10 hips) or failed MoM total hip arthroplasty (6 hips). Mean follow up was 1 year (3 months to 3.3 years). There were no complications in the primary total hip group. In the revision total hip group, only one hip dislocated and this was in a patient with familial dysautonomia and insensitivity to pain. One subject underwent reoperation for acute prosthetic joint infection. No other complications were encountered. Overall dislocation rate was 1.1% and overall complication rate was 2.2%. Conclusions:. These results closely mirror that of the European literature. Dual mobility articulations in total hip arthroplasty have a low short term complication rate in this cohort and provide a simple solution to difficult cases. Indications for these implants include primary and revision total hip arthroplasty in patients at high risk for instability and revision of large MoM implants including hip resurfacing

Background:. While reverse shoulder arthroplasty has shown successful outcomes for a variety of shoulder pathologies, postoperative instability continues to be one of the most common complications limiting outcomes. In the literature, reports of instability range from 2.4%–31%. Many authors recommend an initial attempt at closed reduction followed by a period of immobilization for management of the initial dislocation episode while others may seek to rule out infection or other secondary causes; however there is little data to support either practice. The purpose of this study was to evaluate the outcomes of patients with postoperative dislocation following reverse shoulder arthroplasty managed with closed reduction. Methods:. A retrospective review of all reverse shoulder arthroplasties performed by a single surgeon (MF) from 2002-present was performed to identify all patients treated for postoperative dislocation treated with closed reduction, either in the office setting or under anesthesia in the operating room. A total of 21 patients were identified. Preoperative patient characteristics, implant selection, and time to initial dislocation episode were recorded. Final outcomes including recurrent instability need for revision surgery, ASES outcome score, and range of motion were evaluated. Results:. There were 9 male and 12 female patients. Nearly 50% (10/21) cases had previous surgery, with the vast majority of these being previous arthroplasty (8/10). The average time to first dislocation was 200 days (range: 2 days–961 days), with 62% (13/21) occurring in the first 90 days. At average follow-up of 28 months following the dislocation episode, 62% of these shoulders remained stable (13/21). Six shoulders (29%) required revision surgery for recurrent instability. The revision procedure included a larger glenosphere and socket in all cases. All of these patients remained stable at final follow-up (Ave 25.5 months). In those cases successfully treated with closed reduction the average time to dislocation was 188 days, whereas the average time to initial dislocation in cases requiring revision surgery was 224 days (p = 0.82). All of these patients remained stable at final follow-up. Two shoulders (9%) remained unstable and either declined or were medically unfit to undergo revision surgery. The average ASES score in patients treated with closed reduction for instability was 68.0, and 62.7 for those treated with revision surgery (p = 0.64). Conclusion:. This study shows that an initial dislocation episode following reverse shoulder arthroplasty can be successfully managed with closed reduction and temporary immobilization in over half of cases. The time to dislocation is not related to the likelihood of a successful closed reduction. Given that outcomes following revision surgery are not different from closed treatment we would continue to recommend an initial attempt at closed reduction in all cases of postoperative reverse shoulder arthroplasty dislocation

Introduction. The prevalence of reversing of extension coronal deformity during flexion and how that may change the routine algorithm of soft tissue balancing in total knee arthroplasty (TKA) has not been published. We name this phenomenon, the reversing coronal deformity (RCD). We observed 12% (45 patients) of coronal deformities consistently reverse in flexion in the osteoarthritic knees before surgery. We conclude that RCD phenomena need to be addressed in every TKA and collateral ligament release need to be modified or avoided; otherwise postoperative flexion instability may be inevitable. Femoral rotation adjustment with posterior capsule release has to be attempted first in RCD patients. Method. We define RCD as the reversing of a coronal extension deformity of more than 2° while the knee reaches 90°of flexion. That is to say a 2° or more varus knee in extension becomes a 2° or more valgus at 90° of flexion or vice versa. We retrospectively analyzed, in a multicenter study the alignment patterns of 387 (US = 270, UK = 117) consecutive computer navigated TKA subjects (June 2004–May 2008). 364/387 (US = 252, UK = 112) subjects were eligible for analysis (23 subjects had incomplete data: US = 18, UK = 5). The coronal deformity kinematics was observed during the range of motion and the range of medial /lateral deflections were analyzed. Result:. 260/364 subjects had varus knees and 104/364 subjects had valgus knees. 18 subjects (7%) of the varus knees reversed to valgus and 27 subjects (26%) of valgus knees reversed to varus by 90°pre-operatively. Therefore, the total number of arthritic knees that reversed their coronal deformity from extension to 90° flexion was 45 (12.4%). Knee alignment in extension was 0° ± 2° in 99% of patients. 1% (4 subjects) had more than 2°of varus or valgus in extension. Collateral ligament was released in 4/45 RCD patients in which all had flexion instability of more than 10° (medial/lateral at 90°). The other 40 patients had posterior capsule release with or without femoral rotation adjustment to balance the flexion gap. None of them had flexion instability (medial /later gaping was 4° or less). The preoperative mean femoral rotation was 3.05° of external rotation (ER) in varus knees and 1.9° ER in valgus knee. While in RCD varus knees, the mean femoral rotation was 1.5 ° ER and RCD valgus knees 2.5°ER. Discussion and Conclusion. Our observation has shed the light on a new concept in the kinematics of the knee, namely the reversing of the coronal deformity (RCD) during flexion which occurs in 12% of patients undergoing TKA. Basically, a varus knee in extension behaves like a valgus knee in flexion and vice versa. It is crucial to be aware of this phenomenon when attempting to do soft tissue release to balance the gaps in TKA. Otherwise, widening one gap in extension to correct a fixed deformity may result in an unacceptable overcorrection of the same gap in flexion in those knees that manifest the reverse coronal deformity phenomena. Soft tissue balance algorithm was noted to be different in such cases in which early collateral ligament release resulted in flexion instability