Hip range-of-motion (ROM) is less than normal after rotational acetabular osteotomy for developmental dysplasia of the hip: A simulated ROM analysis.
The optimal reorientation of the acetabulum for developmental dysplasia of the hip (DDH) is unknown in terms of hip range-of-motion (ROM). The simulated ROMs of 52 DDHs after rotational acetabular osteotomy (RAO) with several patterns of femoral head coverage and those of 73 normal hips were analyzed using computer models reconstructed from CT images. After RAO with a lateral center edge angle (LCEA) of 30° and an anterior center edge angle (ACEA) of 55° producing coverage similar to that of normal hips, the maximal flexion and maximal internal rotation at 110° flexion with 20° adduction were significantly smaller than those of the normal group. To achieve ROMs after RAO similar to those of the normal group, an LCEA of 30° with an ACEA of 45°, an LCEA of 25° with an ACEA of 45° to 50°, and an LCEA of 20° with an ACEA of 50° could be preferred angles to target, even though they provided smaller coverage than that of normal hips. After RAO producing femoral head coverage similar to that of normal hips, the maximal flexion and the maximal internal rotation at 110° flexion with 20° adduction were significantly smaller than those of the normal group.
Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan.
Hidetoshi
H
Hamada
Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan.
Masaki
M
Takao
Department of Orthopaedic Surgery, Osaka National Hospital, Osaka, Japan.
Ichiro
I
Nakahara
Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan.
Takashi
T
Sakai
Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Suita, Japan.
Takashi
T
Nishii
Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Suita, Japan.
Nobuhiko
N
Sugano
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006617:Hip Dislocation / Q000601:surgery*; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D010027:Osteotomy; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D055815:Young Adult
femoroacetabular impingement; impingement test; periacetabular osteotomy; range-of-motion; rotational acetabular osteotomy