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Joint Space Widening in Synovial Chondromatosis of the Hip
Pil Whan Yoon, MD1; Jeong Joon Yoo, MD1; Kyung-Hoi Koo, MD1; Kang Sup Yoon, MD1; Hee Joong Kim, MD1
1 Department of Orthopedic Surgery, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul, 110-744, Republic of Korea. E-mail address for H.J. Kim: oskim@snu.ac.kr
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Disclosure: In support of their research for or preparation of this work, one or more of the authors received, in any year, outside funding or grants of less than $10,000 from the Korean Human Technology Research Foundation (KOHTERF-2009-01). Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at the Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, South Korea

Copyright © 2011 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2011 Feb 02;93(3):303-310. doi: 10.2106/JBJS.J.00473
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One of the radiographic findings in synovial chondromatosis of the hip is widening of the joint space between the femoral head and the acetabulum, although the cause and sequelae of the widening are unclear.


Between May 1991 and June 2005, twenty-one patients with synovial chondromatosis of the hip were treated with open synovectomy and removal of osteochondral fragments. Joint space widening was assessed on radiographs made preoperatively, immediately after surgery, and at the time of follow-up. The changes of the radiographic joint space width were evaluated during the mean follow-up period of 5.9 years (range, 2.3 to 12.3 years).


Twelve patients had joint space widening on preoperative radiographs of the hip. Medial joint space widening was seen in three patients, and both medial and superior joint space widening was evident in nine patients. Compared with the medial and superior joint spaces in the unaffected, contralateral hip, those in the affected hip were wider by an average of 44.7% and 35.9%, respectively. The medial joint space widths of the affected hip decreased slightly during the early postoperative period; however, widened joint spaces were persistent at the final follow-up visit, without other important changes. The superior joint space widths did not show substantial changes throughout the postoperative follow-up period.


Joint space widening is a recognized radiographic finding in primary synovial chondromatosis of the hip. Although there was persistence of joint space widening after synovectomy in all patients, this joint space widening did not influence the clinical results at the time of follow-up.

Level of Evidence: 

Prognostic Level IV. See Instructions to Authors for a complete description of levels of evidence.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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