David Backstein

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Distal femoral varus osteotomy (DFVO) of the knee may be indicated for young, active patients with unicompartmental arthritis and valgus deformity. We report on 40 DFVOs with a mean follow-up of 123 months. At the most recent follow-up, 24 knees had good or excellent results (60%), 3 had fair results (7.5%), and 3 had poor results (7.5%). Four in the(More)
BACKGROUND Mechanical failure of femoral stems at the modular junction of revision hip arthroplasty systems has been reported only infrequently. In the current study, the cause of six stem fractures, which occurred in vivo, was analyzed with use of clinical data and failure analysis. METHODS Six patients with a fracture at the mid-stem junction of a(More)
UNLABELLED Massive bone defects are challenging problems in revision knee surgery. When defects are large and uncontained (without a cortical rim), structural allografts may be used to provide support for femoral and tibial components. This study reviewed 68 structural allografts at a mean of 5.4 years for clinical and radiographic outcomes. Indications for(More)
Component malrotation is a recognized cause of post total knee arthroplasty (TKA) pain. We reviewed 24 patients who had TKA revision due to component malrotation as the only objective abnormality. Mean combined component rotation was 6.8° excessive internal rotation, as documented by computed tomography. Twenty-four matched control patients had TKA revision(More)
BACKGROUND While computer-assisted orthopaedic surgery technology may facilitate performance and learning in the expert, its effects on the trainee are unclear. Motor learning theory suggests that, while the real-time feedback provided by computer-assisted orthopaedic surgery should improve performance, it may be detrimental to learning. The purpose of this(More)
BACKGROUND Intraarticular injections of the hip have traditionally required sonographic or fluoroscopic guidance assistance. Previous studies report high failure rates with injections based solely on anatomic landmarks. OBJECTIVES To examine the accuracy of a lateral injection technique in osteoarthritic patients without using image assistance. METHODS(More)
Notching of the anterior femoral cortex during primary total knee arthroplasty can occur when making an anterior femoral bone cut. To examine the increased stress caused by a notch, we used a validated 3-dimensional finite element model of the femur under gait loads. Three factors that affected the stress concentration were identified: First, larger notches(More)
PURPOSE To compare the effectiveness of expert-assisted learning (EAL), peer-assisted learning (PAL), and computer-assisted learning (CAL) on participants' procedural skills acquisition in the simulated setting. METHOD Sixty medical and nursing students practiced urinary catheterization in an expert-, peer- or computer-assisted, simulation-based, learning(More)
BACKGROUND The purpose of our investigation was to compare a digital templating system to conventional templating techniques when preoperatively planning for total hip arthroplasty. METHODS We included 18 consecutive patients with primary osteoarthritis undergoing uncemented total hip arthroplasty in our study. At separate sittings, we independently(More)
Revision surgery for component malrotation in the painful TKA is a relatively novel indication. The purpose of this study was to assess the benefit of revision TKA for component malrotation with regard to the clinical and functional outcomes. Our retrospective case–control study included 51 patients who underwent revision surgery for malrotation with mean(More)