BACKGROUND Recurrent dislocation of the patella in patients with below knee amputation is a known entity. Abnormally high-riding patella (patella alta) and medial patellofemoral ligament insufficiency in these patients predisposes them to patellar instability. The established treatment of this problem is surgical realignment. CASE PRESENTATION A 25 year old male patient with bilateral below k...

Valgus deformity can exist during knee flexion besides extension, which could lead to patellofemoral joint instability and soft tissue imbalance in the flexion gap, and thus complicate the surgical procedures. Valgus deformity during knee flexion can be measured by radiographic analysis using long‐film radiograph and computed tomography (CT) scans.[4] It usually results from a bone defect in th...

Patellar dislocation is a well-recognized major complication after total knee arthroplasty (TKA). Treatment of this injury is determined according to the cause of the dislocation. In particular, proximal realignment, distal realignment, and lateral retinaculum release are options if patellar instability is not caused by prosthetic malposition. Here we report a case of patellar dislocation follo...

BACKGROUND We were not aware of a well-validated patellofemoral joint-specific scoring system. We performed this study to develop and validate a scoring system (Samsung Medical Center [SMC] patellofemoral scoring system) suitable for the evaluation of patellofemoral joint status. METHODS We recruited 179 individuals consisting of a study group of 123 patients with anterior knee pain but witho...

BackgroundTrochlear dysplasia is highly associated with patellofemoral instability. The goal of conservative and surgical treatment to stabilize the patella while minimizing adverse effects. However, there no literature investigating quantitative influence different options on stability in knees trochlear dysplasia. We created exploited a range finite element models address this gap knowledge.M...

Background: Rupture of anterior cruciate ligament (ACL) would cause instability and disability and if left untreated. Reconstruction is performed by different techniques including patellar bone graft, as the strongest device. Application of brace after ACL reconstructions has revealed doubtful results. Methods: One hundred ACL ruptured patients randomized into two groups were reconstructed with...

The primary aim of this study is to document whether patellofemoral arthroplasty is a good treatment option for patellofemoral osteoarthritis and to identify prognostic outcome factors. Secondary aim is to investigate the influence of preoperative tibiofemoral osteoarthritis on the clinical outcome. From 2004 to 2010, 37 Avon patellofemoral prostheses were implanted in 32 patients. Clinical out...

In total knee arthroplasty (TKA), patellofemoral groove design varies greatly and likely has a distinct influence on patellofemoral biomechanics. To analyse the selective influence, five patellofemoral design variations were developed based on Genesis II total knee endoprosthesis (original design, being completely flat, being laterally elevated, being medially elevated, and both sides elevated)...

INTRODUCTION Isolated patellofemoral osteoarthritis can be treated with patellofemoral arthroplasty. CASE PRESENTATION We present two cases of isolated patellofemoral osteoarthritis treated with Low Contact Stress patellofemoral arthroplasty; in both cases the polyethylene mobile-bearing of the patellar component dissociated from the metal backing. One patient had a revision to a Richards pat...