抄録
High tibial osteotomy (HTO) was performed on 1025 medially osteoarthritic knees in 918 patients from 1972 to the present. In this time 455 knees which had HTO before 1990 were observed. Many patients died or were missing during the follow-up period, so only 206 knees out of 455 knees (48 male knees, 407 female knees) were investigated directly and by telephone.
The results differed depending on the OA stage at the operation and the FTA just after HTO. 32 out of 44 knees at stage 2 were satisfactory (73%), 25 of 93 knees at stage 4 were satisfactory (26.8%), but poor in 73%.
Eighteen percent of patients with over 173° FTA after HTO were satisfactory and 50% of patient with less than 172° were satisfactory. In stage 4, FTA after HTO of 167°-165° should be attained to keep good long-term results.
