Mozella Alan de Paula, Borges Gonçalves Felipe, Osterno Vasconcelos Jansen, de Araújo Barros Cobra Hugo Alexandre
Knee Surgery Center, Instituto Nacional de Traumatologia e Ortopedia (Into), Rio de Janeiro, RJ, Brazil.
Rev Bras Ortop. 2014 Mar 31;49(2):154-9. doi: 10.1016/j.rboe.2014.03.018. eCollection 2014 Mar-Apr.
to determine the causes of unicondylar knee arthroplasty failures, as well as identify the implants used and the need of bone grafting in patients undergoing revision UKA in Center of Knee Surgery at the Instituto Nacional de Traumatologia e Ortopedia (INTO) in the period between January 1990 and January 2013.
a retrospective analysis of the medical documentation and imaging, determining the cause of failure of UKA and the time of its occurrence, as well as prosthetic components implanted during the review and the need for bone grafting.
in this study, 27 UKA failures in 26 patients were included. Collapse of one or more components was the main cause of failure, occurring in 33% of patients. Aseptic failure was identified in 30% of cases, progression of osteoarthrosis in 15%, infection and pain 7% each, and osteolysis and polyethylene failure in 4% each. Early failure occurred in 41% of all revisions of UKA and late failure in 59%. 23 patients have undergone revision of UK.
in 35% of revisions the use of bone grafting was needed in tibial area; in 3 cases we needed allograft from Tissue Bank. We did not use metal increase in any of the revision. In one patient we used implant constraint for instability.
确定单髁膝关节置换术失败的原因，识别1990年1月至2013年1月期间在国家创伤与矫形研究所（INTO）膝关节外科中心接受单髁膝关节置换术翻修的患者所使用的植入物以及骨移植的必要性。
对医疗记录和影像学资料进行回顾性分析，确定单髁膝关节置换术失败的原因及其发生时间，以及翻修期间植入的假体组件和骨移植的必要性。
本研究纳入了26例患者中的27例单髁膝关节置换术失败病例。一个或多个组件的塌陷是主要失败原因，发生在33%的患者中。无菌性失败在30%的病例中被识别，骨关节炎进展在15%，感染和疼痛各占7%，骨溶解和聚乙烯磨损各占4%。早期失败发生在所有单髁膝关节置换术翻修病例的41%，晚期失败占59%。23例患者接受了单髁膝关节置换术翻修。
在35%的翻修病例中，胫骨区域需要使用骨移植；3例患者需要使用组织库的同种异体骨。在任何翻修病例中我们均未使用金属增高物。1例患者因不稳定使用了限制性植入物。
