Three-dimensional morphological analysis of the proximal femoral canal, using computer-aided design system, in Japanese patients with osteoarthrosis of the hip.
An accurate three-dimensional morphological analysis of the femur is required to produce well fitting uncemented femoral implants. A computer-aided design system made it possible to produce three-dimensional femoral models and to accurately measure certain parameters with planes standardized for all subjects. The study subjects were Japanese; there were 89 patients (113 hips) with osteoarthrosis (OA) and 18 volunteers (36 hips) free of hip joint complaints and with no abnormal radiological findings (normal; N). The femoral canal was classified into three types, A-I, A-II, and B-II, based on the shape in the frontal and sagittal planes. Either triangular (type T) or circular (type C) shapes were identified at the proximal cross section. Type A-II, which is considered the standard type, accounted for 89% of the N hips, and 42% of the OA hips. Type A-I, with a posterior canal plane strongly inclined toward the anterior, accounted for 26% of the OA hips and 6% of the N hips; 96% of type A-I hips were triangular. Type B-II, which had a steep medial canal plane, accounted for 29% of the OA hips and 6% of the N hips; 63% of type B-II hips were circular.
Kaneuji
A
A
Department of Orthopaedic Surgery, Kanazawa University, School of Medicine, 13-1 Takara-machi, Kanazawa 920-8641, Japan.
Matsumoto
T
T
Nishino
M
M
Miura
T
T
Sugimori
T
T
Tomita
K
K
D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D003196:Computer Graphics; D003198:Computer Simulation; D017076:Computer-Aided Design; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging* / Q000601:surgery; D006618:Hip Dislocation, Congenital / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging* / Q000601:surgery; D011474:Prosthesis Design; D014057:Tomography, X-Ray Computed