Locking of the knee caused by localized pigmented villonodular synovitis: a case report

Abstract

Pigmented villonodular synovitis (PVS) occurs in two forms: diffuse PVS and localized pigmented villonodular synovitis. In this report, a 40-year-old woman presented with a history of recurrent episodes of knee locking and pain. Arthroscopy revealed a nodular pedunculated mass occupying the area anterior to the intercondylar notch of the femur. Histological examination of the tissue confirmed the diagnosis of PVS. After surgery, the patient's symptoms of pain and recurrent locking promptly resolved.

Localised pigmented villonodular synovitis of Hoffa’s fat pad- treatment using 70 degree arthroscope and superolateral portal: a case report

“…Clinically localized PVNS presents with signs and symptoms that reflect internal derangement of the knee and include chronic insidious pain that is of several months' duration, years at times, swelling, locking of the knee, a palpable mass, and sometimes restriction of movement. [8][9][10][11] Radiologically the findings are nil, however MRI is the radiological investigation of choice. MRI shows the lesion on T1 and T2 weighted images as focal lobulated mass, though MRI is not entirely specific.…”

Locked knee from superior dislocation of the patella-diagnosis and management of a rare injury

“…Knee locking is a fairly common symptom often caused by a torn meniscus or loose body. Unusual causes of a locked knee include gouty tophi [3, 4], intra‐articular lipoma [22], pigmented villonodular synovitis [9, 25], and osteochondral fracture of the patella [6]. An unusual case of a locked knee from interlocking osteophytes between the inferior pole of the patella and the distal medial femoral condyle without any history of trauma is presented and discussed.…”