The acetabular labrum seal: a poroelastic finite element model

被引:277
作者
Ferguson, SJ
Bryant, JT
Ganz, R
Ito, K
机构
[1] AO ASIF Res Inst, CH-7270 Davos, Switzerland
[2] Queens Univ, Dept Mech Engn, Kingston, ON K7L 3N6, Canada
[3] Univ Bern, Inselspital, Dept Orthopaed Surg, CH-3010 Bern, Switzerland
基金
加拿大自然科学与工程研究理事会;
关键词
labrum; hip; cartilage; sealing; finite element;
D O I
10.1016/S0268-0033(99)00099-6
中图分类号
R318 [生物医学工程];
学科分类号
0831 [生物医学工程];
摘要
Objective. The aim of the study is to investigate the labrum's ability to seal a pressurised layer of synovial fluid within the joint, and to study the influence of this sealing mechanism on cartilage deformation, interstitial fluid pressure and collagen solid matrix stresses. Background. Cartilage degeneration has been observed in conjunction with labrum pathology. However, little is known about the function of the labrum. Experimental observations have been reported which are consistent with a sealing function of the labrum. Methods. The model was an axisymmetric geometric approximation of the acetabular and femoral cartilage layers and the surrounding labrum. A poroelastic formulation was used to account for the solid and fluid components of these hydrated tissues. A sensitivity analysis of the labrum material properties was carried out. Results. With a compressive load of 1200 N applied across the joint model, the labrum could seal a layer of pressurised fluid between the femur and acetabulum, thus preventing contact of the articulating surfaces. With this sealing effect, loads were transferred across the joint predominantly by uniform pressurisation of the interstitial fluid of the cartilage layers. In the absence of this sealing, strains within the solid matrix of the cartilage layers were higher (e.g. 20% vs. 3%). Conclusions. The labrum can seal against fluid expression from the joint space. This sealing function protects the cartilage layers of the hip. Relevance Current treatments for labrum damage and early arthrosis may compromise the sealing function of the labrum. With continued study of the function and importance of the labrum, new surgical repair strategies can be developed to maintain the overall function of the hip joint. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:463 / 468
页数:6
相关论文
共 33 条
[1]
ACETABULAR LABRUM TEARS - CAUSE OF HIP PAIN AND DEGENERATIVE ARTHRITIS [J].
ALTENBERG, AR .
SOUTHERN MEDICAL JOURNAL, 1977, 70 (02) :174-175
[2]
A THEORETICAL SOLUTION FOR THE FRICTIONLESS ROLLING-CONTACT OF CYLINDRICAL BIPHASIC ARTICULAR-CARTILAGE LAYERS [J].
ATESHIAN, GA ;
WANG, HQ .
JOURNAL OF BIOMECHANICS, 1995, 28 (11) :1341-1355
[3]
INCONGRUENT SURFACES IN HUMAN HIP JOINT [J].
BULLOUGH, P ;
GOODFELLOW, J ;
GREENWALD, AS ;
OCONNOR, J .
NATURE, 1968, 217 (5135) :1290-+
[4]
THE TORN ACETABULAR LABRUM [J].
DORRELL, JH ;
CATTERALL, A .
JOURNAL OF BONE AND JOINT SURGERY-BRITISH VOLUME, 1986, 68 (03) :400-403
[5]
Dowson D, 1969, Biomed Eng, V4, P160
[6]
Eckstein F, 1997, ACTA ANAT, V158, P192
[7]
Fein R. S., 1967, P I MECH ENG, V181, P125
[8]
FITHIAN DC, 1990, CLIN ORTHOP RELAT R, P19
[9]
INTRA-ARTICULAR ACETABULAR LABRUM - POSSIBLE ETIOLOGICAL FACTOR IN CERTAIN CASES OF OSTEOARTHRITIS OF THE HIP [J].
HARRIS, WH ;
BOURNE, RB ;
OH, I .
JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME, 1979, 61 (04) :510-514
[10]
Helmig P, 1993, J Shoulder Elbow Surg, V2, P209, DOI 10.1016/1058-2746(93)90064-N