Bailie A G, Lewis P L, Brumby S A, Roy S, Paterson R S, Campbell D G
Musgrave Park Hospital, Stockman's Lane, Belfast, Northern Ireland BT9 7JB, UK.
J Bone Joint Surg Br. 2008 Apr;90(4):446-50. doi: 10.1302/0301-620X.90B4.20319.
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.
Unispacer膝关节系统是一种钴铬合金自定心胫骨半关节置换装置，用于治疗膝关节孤立性内侧间室骨关节炎。其使用指征与高位胫骨截骨术相似，但植入时不需要进行骨切割或部件固定，也不会影响未来的膝关节置换手术。对2003年6月至2004年8月期间连续接受Unispacer治疗的18例患者进行了一项前瞻性研究，以确定该装置的早期临床效果。患者的平均年龄为49岁（40至57岁）。共有8例患者（44%）在两年内需要翻修。其中2例需要更换更大的间隔器，6例需要转换为单髁或全膝关节置换。在最近一次复查时，12例患者（66.7%）的Unispacer仍在位。这些患者在平均随访19个月（12至26个月）时的平均改良视觉模拟评分为3.0（0至11.5）。平均疼痛程度为术前平均水平10的30%。使用该装置的早期临床结果令人失望。这项研究表明在膝关节孤立性内侧间室骨关节炎中使用Unispacer与高翻修手术率相关，且疼痛缓解效果不可预测。
