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Type: Journal article
Title: The Unispacer knee implant
Author: Bailie, A.
Lewis, P.
Brumby, S.
Roy, S.
Paterson, R.
Campbell, D.
Citation: Journal of Bone and Joint Surgery: British Volume, 2008; 90-B(4):446-450
Publisher: British Editorial Soc Bone Joint Surgery
Issue Date: 2008
ISSN: 0301-620X
Statement of
A. G. Bailie, P. L. Lewis, S. A. Brumby, S. Roy, R. S. Paterson and D. G. Campbell
Abstract: The Unispacer knee system is a cobalt-chrome self-centring tibial hemiarthroplasty device for use in the treatment of isolated medial compartment osteoarthritis of the knee. The indications for use are similar to those for high tibial osteotomy, but insertion does not require bone cuts or component fixation, and does not compromise future knee replacement surgery. A prospective study of a consecutive series of 18 patients treated with the Unispacer between June 2003 and August 2004 was carried out to determine the early clinical results of this device. The mean age of the patients was 49 years (40 to 57). A total of eight patients (44%) required revision within two years. In two patients revision to a larger spacer was required, and in six conversion to either a unicompartmental or total knee replacement was needed. At the most recent review 12 patients (66.7%) had a Unispacer remaining in situ. The mean modified visual analogue score for these patients at a mean follow-up of 19 months (12 to 26) was 3.0 (0 to 11.5). The mean pain level was 30% that of the mean pre-operative level of 10. The early clinical results using this device have been disappointing. This study demonstrates that use of the Unispacer in isolated medial compartment osteoarthritis is associated with a high rate of revision surgery and provides unpredictable relief of pain.
Keywords: Knee Joint
Osteoarthritis, Knee
Postoperative Complications
Range of Motion, Articular
Treatment Outcome
Arthroplasty, Replacement, Knee
Follow-Up Studies
Prospective Studies
Prosthesis Design
Knee Prosthesis
Middle Aged
Rights: Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
DOI: 10.1302/0301-620X.90B4.20319
Appears in Collections:Aurora harvest 5
Orthopaedics and Trauma publications

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