Knee Surg Relat Res 2019 Mar; 31(1): 67-71  https://doi.org/10.5792/ksrr.18.015
Osteochondral Lesion in Diffuse Pigmented Villonodular Synovitis of the Knee
Anshu Shekhar, MS1, Savneet Singh, MS1, Shantanu Sudhakar Patil, MS2, and Sachin Ramchandra Tapasvi, MS, FRCS1
1Department of Orthopaedic Surgery, The Orthopaedic Speciality Clinic, Pune; 2Department of Orthopaedic Surgery, SRM Medical College Hospital and Research Centre, Tamil Nadu, India
Correspondence to: Anshu Shekhar, MS Department of Orthopaedic Surgery, The Orthopaedic Speciality Clinic, 16 Status Chambers, 1221/A Wrangler Paranjpe Road, Pune 411004, India Tel: +91-91-4605-0657 E-mail: dr.anshushekhar@gmail.com
Received: February 5, 2018; Revised: September 4, 2018; Accepted: October 2, 2018; Published online: March 1, 2019.
© Korean Knee Society. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Pigmented villonodular synovitis (PVNS) is a rare benign condition that is locally aggressive and may destructively invade the surrounding soft tissues and bone causing functional loss of the joint and the limb. The knee is the most affected joint (range, 28% to 70%) but involvement of the bone is not a common feature seen at this site. We present a rare case of diffuse PVNS of the knee associated with subchondral cyst of the lateral femoral condyle. This posed a diagnostic dilemma because of bone invasion. The radiological image of synovitis was pathognomonic of PVNS but etiology of the osteolytic lesion was confirmed only on histopathology. The large osteochondral defect was eventually managed in a staged manner with bone grafting and osteochondral autograft transfer.
Keywords: Knee, Cartilage, Synovitis, Pigmented villonodular


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