- 期刊
The Clinical and Radiographical Results of the Single Layer Porous-Coated Femoral Component-Five to Nine Years Follow-up
並列摘要
From 1984 to 1987, a single layer full porous-coating femoral component (Roy-Camille type) was used for primary cementless total hip arthroplasty in 80 patients (85 hips). Seventy-two patients (77 hips) with a minimal follow-up of 5 years (mean 7.2 years, range from 5 to 9 years) were reviewed. The average age of patient was 51 (range, 26 to 73). The diagnosis of patients included 31 avascu-lar necrosis of femoral head, 28 osteoarthritis, 7 traumatic osteoarthritis, 4 ankylosing spondylitis, 4 septic hip, and 3 rheumatoid arthritis. The pre-opera-tive hip rating (modified d’Aubigne and Postel rating system) averaged 16.3 points (range, 11 to 18 ) at the last follow-up. Thigh pain occurred in 5 hips (6.4%) Osteolysis was also seen in 5 hips (6.4%). Cortical thinning around the femoral component was significant at proximal (P ＜ 0.05) and middle (P ＜ 0.05) level. Totally, 6 hips needed reoperation with mean service time of 92 (63 – 112) months due to aseptic loosening in 4 hips and septic loosening in 2 hips. At the same follow-up period, 28 acetabular components failed, 27 of them were revised. The hip rating score in the survival hips was 16.3 (11-18) points at the latest follow-up. From this study, we found that the single layer fully porous-coated stem had low loosening rate after 5-year follow- up period. Diffuse bone ingrowth into the porous coating was found in most of the cases. Less stress shelding effect in comparison with the traditional multi-layered fully porous-coating prosthesis was also noted. Single layer porous-coating fashion may be one of the ideal design for the femoral component.