STUDY DESIGN Controlled laboratory study using a cross-sectional design. OBJECTIVES To compare patellofemoral joint kinematics, femoral rotation, and patella rotation between females with patellofemoral pain (PFP) and pain-free controls using weight-bearing kinematic magnetic resonance imaging. BACKGROUND Recently, it has been recognized that patellofemoral malalignment may be the result of...

INTRODUCTION Nail-patella-syndrome (NPS) is a rare autosomal-dominant inherited disease with pathologies of nails, skeleton, kidneys, and eyes. Linkage to a mutated gene was found. It codes for the transcription-factor LMX1B. In most cases knees are symptomatic. Patients have hypoplastic patellae, which are laterally subluxated. In those individuals a sagittal trochlear fibrous septum was found...

In osteoarthritis the articular cartilage becomes roughened, fibrillar, softened, thinned, and finally eroded, with secondary changes occurring in the underlying bone. Histologically, early cartilage lesions in osteoarthritis are characterized by loss of metachromasia in the matrix, and it has been postulated that the initial disturbance involves the intercellular substance (1, 2). The decrease...

Lateral luxation of the patella has been described in horses and ponies. Medial luxation has been reported only twice. Upward fixation of the patella is not true luxation. This report concerns two cases of lateral luxation of the patella related to hypoplasia of the lateral ridge of the trochlea of the femur. Disciplines Large or Food Animal and Equine Medicine | Medicine and Health Sciences | ...

The incidence of osteomyelitis constantly declines. While the disease most commonly affects the long bones, involvement of the patella is rarely seen. Due to this rarity and the variable clinical presentation, diagnosis is often delayed. The present case report describes a 10-year-old female patient with a delayed diagnosis of patella osteomyelitis. The diagnostic procedures and the treatment r...

BACKGROUND At primary and revision knee arthroplasty, a defi cient patella with a contained or uncontained defect is often encountered,1,2 especially in the presence of longstanding maltracking. In these cases, reconstruction is diffi cult, leaving an unsupported implant. Following the good outcomes achieved using cement fi xation of large defects of the tibial plateau augmented with screws,3 w...

Figure 1. Lateral knee radiograph showing patella alta. A 68-year-old male presented to the emergency department with anterior right knee pain after falling at home and directly hitting his patella on the stepladder edge while he was going upstairs. Physical examination revealed infrapatellar region painful swelling and impaired knee extension. Knee radiographs showed no fracture; however, the ...

Knee injuries, acute or chronic are one of the most often injuries in sport, both adults and adolescents. They mostly occur contact sports due to torsional decelaration forces, causing around 80% painful knee conditions that disable performance.