金属大头髋(ASRTM XL)的临床应用特点

目的 探讨金属大头髋(ASRTMXL)的临床应用特点.方法 对14例患者采用ASRTMXL金属大头髋进行全髋关节置换术(total hip arthroplasty,THA),其中强直性脊柱炎合并髋关节融合2髋,股骨头坏死3髋,继发性骨关节炎2髋,股骨颈骨折7髋.根据随访结果对金属大头髋的设计特点、临床特点进行分析.结果 本组患者术后1周开始扶拐行走,6周去拐行走,髋关节前屈、后伸、内旋、外旋、内收、外展显著改善,Harris评分术后平均90分(75～100分)、比术前平均30分(13～50分)显著提高.术后X线片示假体位置正确,外翻角、前倾角正常.无早期并发症发生.结论 金属大头髋早期随访效果好,假体设计具有磨损率低、活动范围大、脱位发生率低、臼杯变形小等特点.

Clinical application of metal-on-metal hip joint prosthesis with large heads(ASRTM XL)

Objective To explore clinical characteristic of metal-on-metal hip joint prosthesis with large heads(ASRTMXL).Methods Total hip arthroplasty(THA)with ASRTMXL was performed in 14 patients including two with ankylosing spondylitis combined with hip amalgamation,three with avascular necrosis,two with secondary osteoarthritis and seven with femoral neck fractures.Based on shortterm follow-up results,we analyzed its design characteristic and clinical properties.Results All patients walked with crotches one week after operation and began weight bearing without support six weeks later.An improvement was seen on the average range of motion of the hip including anteflexion,retroextension,internal rotation,external rotation,adduction and abduction.The mean Harris score was increased from precperative 30 points(13-50 points)to postoperative 90 points(75-100 points),with statistical difference.Postoperative X-ray showed right positions of the prostheses,normal abduction angle and anteversion angle,without complications cccurred.Condusion Short-term follow-up results show that metal-on-metal hip joint prosthesis with large heads has advantages of lower wearing,large range of motion,few dislocation and small deformation of acetabular cup.