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Between 1973 and 1985, 18 knees in 17 patients were treated for rupture of the patellar tendon after total knee arthroplasty (TKA), accounting for 0.17% of the TKAs performed at the authors' institution during the same interval. Follow-up study was from two and one-half years to four years. Four ruptures occurred in patients who had had a distal patellar(More)
OBJECTIVE Investigation of the influence of weakness in the vastus medialis oblique muscle on patellar tracking. DESIGN In vitro biomechanical study. BACKGROUND Currently, the influence of weakness in the vastus medialis oblique muscle on patellar tracking has not been well understood. METHODS Seven human cadaveric knees were used. The direction of(More)
BACKGROUND Although general guidelines have been proposed for proximal tibial and supracondylar osteotomies, double level osteotomy provides the advantage of maintaining neutral joint-line obliquity in addition to correcting limb malalignment around the knee. The goal of this prospective study was to determine the outcome of double level osteotomy of the(More)
Fifteen patients sustained fractures of the tibia after geometric and polycentric total knee arthroplasty. The mean follow-up after arthroplasty was 45.1 months. The chief causes for the stress fractures were axial malalignment and improper component orientation. All fifteen patients experienced loosening of the prosthesis and required revision arthroplasty(More)
The prognosis for peroneal palsy after total knee arthroplasty (TKA) is poorly defined. Twenty-six postoperative peroneal palsies occurred after 8998 TKAs performed between 1972 and 1985. Eighteen patients had complete and eight had incomplete peroneal palsies. Twenty-three had both motor and sensory deficits, and three had only motor deficits. At an(More)
The patellofemoral joint is an important source of pain and complications following total knee arthroplasty. Anterior knee pain, patellar instability, fracture, rupture of the extensor mechanism, and a variety of miscellaneous problems affecting the patella can adversely affect the results of a total knee arthroplasty. Because patellofemoral complications(More)
An evaluation of 78 knees in 63 patients using the cruciate-sparing total condylar prosthesis was performed. At a mean of 10 years following the arthroplasty there were 86% good or excellent results in knees with an all-polyethylene tibial component compared to 95% with a metal-backed tibial component (NS). Survivorship at 10 years using an endpoint of(More)
Questionnaires are commonly used in orthopaedic outcome studies. This study sought to determine if responses to a simple standardized questionnaire correlated with responses obtained during a physician interview in evaluation of clinical outcome following hip and knee arthroplasty. One hundred sixty-two patients with 201 hip and knee arthroplasties were(More)
Twenty-five knees with symptomatic lateral patellar instability after total knee arthroplasty (TKA) were treated by operative realignment. Causes of instability include errors in surgical technique, quadriceps imbalance, and trauma. Fourteen knees had proximal realignment, nine had combined proximal and distal realignment, and two had component revision. At(More)