Dorr L D, Lewonowski K, Lucero M, Harris M, Wan Z
USC Center for Arthritis and Joint Implant Surgery, Los Angeles, CA 90033, USA.
Clin Orthop Relat Res. 1997 Jan(334):157-67.
The APR-I Hip System was designed for metaphyseal bone attachment by proximal patch porous coating and the acetabular component was a hemisphere fixed with screws. The results of 100 consecutive primary total hip arthroplasties performed with the APR-I were studied in patients still alive after an average of 6.7 years. The selection of hips for implantation of this hip system was limited to those patients in whom a satisfactory intraoperative fit could be obtained. This resulted in a distribution of patients such that 75% were younger than age 65 years and only 15% had osteoporotic bone. The revision rate was 16% with a mechanical failure rate of 11%. Seventy percent of hips had progressive loss of fixation. loss of femoral component fixation was correlated with younger patient age, higher patient activity level, metaphyseal fill of less than 90%, and increased polyethylene wear and osteolysis. Eighty-nine percent of hips maintained femoral neck contact with the porous coated collar. The acetabular component was well fixed in 97% of hips. The failure rate of the APR-I stem is unacceptably high and this stem is no longer used by the authors.
APR-I髋关节系统设计为通过近端贴片多孔涂层实现干骺端骨附着，髋臼部件为用螺钉固定的半球形。对平均6.7年后仍存活的患者进行的连续100例使用APR-I进行的初次全髋关节置换术的结果进行了研究。该髋关节系统植入髋部的选择仅限于那些术中能获得满意贴合度的患者。这导致患者分布为75%年龄小于65岁，只有15%患有骨质疏松性骨病。翻修率为16%，机械故障率为11%。70%的髋关节出现进行性固定丧失。股骨部件固定丧失与患者年龄较轻、患者活动水平较高、干骺端填充小于90%、聚乙烯磨损增加和骨溶解有关。89%的髋关节保持股骨颈与多孔涂层柄环接触。髋臼部件在97%的髋关节中固定良好。APR-I柄的故障率高得令人无法接受，作者不再使用这种柄。
