Davey J R, Harris W H
Orthopaedic Research Laboratory, Massachusetts General Hospital, Boston 02114.
Clin Orthop Relat Res. 1988 Jun(231):97-102.
Seventy consecutive total hip arthroplasties were performed using a porous-coated acetabular component consisting of a cobalt chrome substrate to which cobalt chrome beads were sintered. Fifty-six were primary arthroplasties and 14 were revisions. The authors analyzed the immediate postoperative roentgenographs of all 70 hips and the follow-up roentgenographs of the 66 hips that were followed for a minimum of two years, the average follow-up period being 30 months. Loose cobalt chrome beads were diagnosed in ten of the 70 hips (14.3%), five (8.9%) in the primary arthroplasties, and five (35.7%) in the revision arthroplasties. In two of the primary arthroplasties and three of the revision arthroplasties, the loose beads were observed on the immediate postoperative roentgenographs. None of the acetabular components appeared loose by other roentgenographic criteria. The sintering technique used in the manufacture of these implants did not prevent loosening of cobalt chrome beads from porous-coated cobalt chrome acetabular components. A longer follow-up period is required to assess fully the clinical significance.
连续进行了70例全髋关节置换术，使用的髋臼部件为多孔涂层，由烧结有钴铬珠的钴铬基底组成。其中56例为初次置换，14例为翻修手术。作者分析了所有70例髋关节术后即刻的X线片，以及66例随访至少两年的髋关节的随访X线片，平均随访期为30个月。在70例髋关节中有10例（14.3%）诊断出钴铬珠松动，初次置换中有5例（8.9%），翻修手术中有5例（35.7%）。在2例初次置换和3例翻修手术中，术后即刻X线片上就观察到了松动的珠子。根据其他X线标准，没有髋臼部件出现松动。制造这些植入物所使用的烧结技术未能防止钴铬珠从多孔涂层钴铬髋臼部件上松动。需要更长的随访期来全面评估其临床意义。
