Lower Extremity Alignment in Rheumatoid Arthritis. FTA and Deformity of the Hindfoot.:FTA and Deformity of the Hindfoot

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We investigated the femoro-tibial angle (FTA) and deformity of the hindhoot radiographically in 80 knees and 80 feet of classical or definite RA patients.Twelve knees (15%) had FTA values less than 169°, 56 knees (70.0%) had FTA values between 170° to 179° and 12 knees (15%) had FTA values qreater than 180°. There were 44 normal hindfeet (55.0%), 8 cases of flatfoot (10.0%), 15 feet with valgus deformity (18.7%) and there were no cases of varus deformity. Four of the 12 knees (33.3%) with FTA values less than 169° had valgus deformities of the hindfoot and four had planovalgus (33.3%). Seven of the 12 knees (58.3%) with FTA values qreate than 180° had normal hind feet. Feet joint with qreater than stage 3 disease were more frequently found in cases with in knees which had FTA values less than 169°. Feet joint with qreater than stage 3 disease were not found in patients with knees which had FTA values greater than 180°. This suggested that valgus deformity of the feet may cause a simular deformity of the knees.
西日本整形・災害外科学会の論文