The purpose of this study is to evaluate the mid-term results of clinical and radiographic results Hi-tech knee a cementless total knee arthroplasty (Nakashima medical Co. Ltd., Okayama, Japan). This TKA system was developed in Chiba University from 1994. The characteristic of this system are flat on flat CR-TKA and cementless fixation. Contact surface are made of titanium alloy and UHMWPE, which is produced by the direct compression mold manufacturing method. Between May 1998 and May 2005, we performed 53 consecutive primary TKAs for 42 patients. There were 41 women and 1 man with a mean age of 64.4 years (39 to 78 years). The average follow up period was 7 years 8 months (5 years to 12 years). Osteoarthritis knee were 21 knees and rheumatoid arthritis were 32 knees. The mean pre-operative FTA was 181.7 degrees (168 to 203 degrees). The method of the operation went in measured cut technique for all cases. All 53 knees were implanted with a cruciate retaining prosthesis. All comportments, included a patella component, were fixed without cement. Clinical evaluations were performed according to American Knee Society (KS) system, knee score and function score.Introduction
Material and Method
A 55-year-old woman who was diagnosed as RA (stage, class ) in 1995 had undergone right total elbow arthroplasty (TEA) in October 2006. We implanted her prosthesis FINE ELBOW® (Nakashima Medical, Japan). Prosthesis of the humerus side is made of Co-Cr-Mo, and the ulna side is of polyethylene. Radius side is metal back system which inserts a polyethylene joint part in metal holder made by Co-Cr-Mo. All components were fixed by cement. She complained her right elbow uncomfortable gradually from January 2008. X-ray radiograph showed loosening of the ulnar component. So we performed revision surgery using ulnar revision sack in May 2008. This ulnar component had only a product made in polyethylene and we inserted the component of the product made in the polyethylene in a metal sack. The operation was successed and now she does housework. We think that strength is not worthy of the ulnar component made by polyethylene in TEA for the patient with terrible joint destruction and high daily activity patient of rheumatoid arthritis.
