Revision Arthroplasty using Thtoplast - HA Composites for Acetabular Bone Deficiencies

Kim, Young Yong; Ko, Han Suk; Seo, Jin Su; Lee, Dong Hun; Moon, Hyeong Tae; Kang, Yeong Hun; Sung, Yerl Bo; Ahn, Jae Yong; Shim, Jae Ik; Lee, Sung Jong; Park, Young Jin; Choi, Iyl Kyu

Abstract

Sixty-eight revisions of total hip arthroplasties from sixty-one patients were performed using allogenic cancellous chip bone and fine granules of HA for bone deficiencies of the acetabulum at two hospitals in Seoul since September 1992. In our practice, acetabular deficiencies were classified into two broad categories, which were based on our provisional treatment protocol. For the segmental deficiencies of the acetabulum, we employed the method of using the cemented acetabular component. In the mean time, Ling technique of impaction graft with PMMA cement were also employed. For the cavitary deficiencies of the acetabulum, we used several types of uncemented ingrowth cups with HA granules and Tutoplast was used to further ameliorate the bony integration. In addition, we obtained good results in cavitary deficiencies of the acetabulum with C.L.S. Expansion Cup and Ringloc fin Cups which seem that initial stability during the cup installation were remarkable. Unfortunately, we had 5 cases of clinical failure, which consist of bone graft incorporation, where eventual resorption of the graft and implant migration were resulted. Nevertheless electromicroscopic finding of interface taken from failure showed partial new trabecular formation and physicochemical bonding near the host bone bed in some cases. Although primary stability of reconstructive surgery was acceptable, Tutoplast - HA granule composites have similar effect of incorporation to host bone compared with other method of allogenic bonegraft storage, which remodeled after 5 years. Thus, this phenomenon requires further investigation of molecular biological role of tissue substance known as cytokine, as well as microscopic histology.