TY - JOUR
T1 - Articular cartilage friction increases in hip joints after the removal of acetabular labrum
AU - Song, Yongnam
AU - Ito, Hiroshi
AU - Kourtis, Lampros
AU - Safran, Marc R.
AU - Carter, Dennis R.
AU - Giori, Nicholas J.
N1 - Funding Information:
This work was supported by the VA Palo Alto Bone and Joint Rehabilitation Research and Development Center, Department of Veterans Affairs, and by a Korea University Research Grant.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/2/2
Y1 - 2012/2/2
N2 - The acetabular labrum is believed to have a sealing function. However, a torn labrum may not effectively prevent joint fluid from escaping a compressed joint, resulting in impaired lubrication. We aimed to understand the role of the acetabular labrum in maintaining a low friction environment in the hip joint. We did this by measuring the resistance to rotation (RTR) of the hip, which reflects the friction of the articular cartilage surface, following focal and complete labrectomy. Five cadaveric hips without evidence of osteoarthritis and impingement were tested. We measured resistance to rotation of the hip joint during 0.5, 1, 2, and 3 times body weight (BW) cyclic loading in the intact hip, and after focal and complete labrectomy. Resistance to rotation, which reflects articular cartilage friction in an intact hip was significantly increased following focal labrectomy at 1-3 BW loading, and following complete labrectomy at all load levels. The acetabular labrum appears to maintain a low friction environment, possibly by sealing the joint from fluid exudation. Even focal labrectomy may result in increased joint friction, a condition that may be detrimental to articular cartilage and lead to osteoarthritis.
AB - The acetabular labrum is believed to have a sealing function. However, a torn labrum may not effectively prevent joint fluid from escaping a compressed joint, resulting in impaired lubrication. We aimed to understand the role of the acetabular labrum in maintaining a low friction environment in the hip joint. We did this by measuring the resistance to rotation (RTR) of the hip, which reflects the friction of the articular cartilage surface, following focal and complete labrectomy. Five cadaveric hips without evidence of osteoarthritis and impingement were tested. We measured resistance to rotation of the hip joint during 0.5, 1, 2, and 3 times body weight (BW) cyclic loading in the intact hip, and after focal and complete labrectomy. Resistance to rotation, which reflects articular cartilage friction in an intact hip was significantly increased following focal labrectomy at 1-3 BW loading, and following complete labrectomy at all load levels. The acetabular labrum appears to maintain a low friction environment, possibly by sealing the joint from fluid exudation. Even focal labrectomy may result in increased joint friction, a condition that may be detrimental to articular cartilage and lead to osteoarthritis.
KW - Acetabular labrum
KW - Articular cartilage
KW - Cartilage friction
KW - Hip
KW - Osteoarthritis
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U2 - 10.1016/j.jbiomech.2011.11.044
DO - 10.1016/j.jbiomech.2011.11.044
M3 - Article
C2 - 22176711
AN - SCOPUS:84856042756
SN - 0021-9290
VL - 45
SP - 524
EP - 530
JO - Journal of Biomechanics
JF - Journal of Biomechanics
IS - 3
ER -