TY - JOUR
T1 - The Position of the Bipolar Cup Reflects the Direction of the Hip Contact Force Acting on It
AU - Lee, Mel Shiuann-Sheng
AU - Chen, Alvin Chao-Yu
AU - Kuo, Chung-Hsien
AU - Tai, Ching Lung
AU - Senan, Vinesh
AU - Shih, Chun-Hsiung
PY - 2007/2
Y1 - 2007/2
N2 - We radiographically measured the bipolar cup position to analyze the direction of joint force acting on the bipolar cup. The abduction angle of the bipolar cup was measured in each radiograph taken immediately and at six 12 weeks and yearly after the operation. Radiographs in patients with weight bearing were also investigated. The results indicated that the abduction angle of the bipolar cup was 24.1° ± 11.2° immediate postoperatively and was 16.2° ± 5.1° at 6 weeks, 16.1° ± 5.1° at 3 months, and 16.2° ± 5.1° at 1 year. The cup abduction angles with weight bearing were not different from those without weight bearing and were 15.9° ± 4.9°, 16.2° ± 4.4°, and 16.1° ± 4.7° on the supine, double-legged stance, and single-legged stance radiographs, respectively. Because the position of the bipolar cup reflects the direction of loads pivoting on it, the direction of the joint force in the frontal plane acting on the bipolar prosthesis is about 16° to vertical.
AB - We radiographically measured the bipolar cup position to analyze the direction of joint force acting on the bipolar cup. The abduction angle of the bipolar cup was measured in each radiograph taken immediately and at six 12 weeks and yearly after the operation. Radiographs in patients with weight bearing were also investigated. The results indicated that the abduction angle of the bipolar cup was 24.1° ± 11.2° immediate postoperatively and was 16.2° ± 5.1° at 6 weeks, 16.1° ± 5.1° at 3 months, and 16.2° ± 5.1° at 1 year. The cup abduction angles with weight bearing were not different from those without weight bearing and were 15.9° ± 4.9°, 16.2° ± 4.4°, and 16.1° ± 4.7° on the supine, double-legged stance, and single-legged stance radiographs, respectively. Because the position of the bipolar cup reflects the direction of loads pivoting on it, the direction of the joint force in the frontal plane acting on the bipolar prosthesis is about 16° to vertical.
KW - abduction angle
KW - bipolar
KW - joint reaction force
KW - radiographic measurement
KW - weight bearing
UR - http://www.scopus.com/inward/record.url?scp=33846544951&partnerID=8YFLogxK
U2 - 10.1016/j.arth.2006.02.079
DO - 10.1016/j.arth.2006.02.079
M3 - 文章
C2 - 17275632
AN - SCOPUS:33846544951
SN - 0883-5403
VL - 22
SP - 189
EP - 194
JO - Journal of Arthroplasty
JF - Journal of Arthroplasty
IS - 2
ER -