An in vitro investigation of the acetabular labral seal in hip joint mechanics
An in vitro investigation of the acetabular labral seal in hip joint mechanics
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DOI：
10.1016/s0021-9290(02)00365-2
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发表时间：
2003-02-01
影响因子：
2.4
通讯作者：
Ito, K
中科院分区：
文献类型：
--
作者：
Ferguson, SJ;Bryant, JT;Ito, K
唇部病理可能通过改变髋关节软骨层之间的负荷传递和内部应力而导致早期关节退变。我们假设唇骨封闭髋关节，在关节腔内产生流体静压力，从而限制软骨层的固结速度。在恒定载荷为0.75倍体重，或循环正弦载荷为0.75+/-0.25倍体重的情况下，测量了6个人髋关节在全唇切除前后的整体软骨蠕变固结。测量髋臼内液体压力。唇部切除后，初始固结率增加22%(p=0.02)，最终固结位移增加21%(p=0.02)。最终固结率无明显差异。加载类型(恒定与循环)对测量的固结特性没有显著影响。在六个髋关节中有三个观察到液体加压。测量的平均压力为：恒定载荷下，完整关节为541+/-61kPa，下唇切除后为216+/-165kPa；循环载荷下，完整关节内压力为550+/-56kpa，下唇切除后为195+/-145kPa。实验中观察到的趋势支持了先前有限元分析的预测。有唇关节间隙内的流体静力压力比无唇间隙大，这可能会增强关节的润滑性。没有唇的软骨固结比有唇的更快，因为唇为间质液体的表达增加了额外的阻力。然而，这两种封闭机制都依赖于唇骨与股骨头的适合性。(C)2002爱思唯尔科学有限公司。保留所有权利。
Labrum pathology may contribute to early joint degeneration through the alteration of load transfer between, and the stresses within, the cartilage layers of the hip. We hypothesize that the labrum seals the hip joint, creating a hydrostatic fluid pressure in the intra-articular space, and limiting the rate of cartilage layer consolidation. The overall cartilage creep consolidation of six human hip joints was measured during the application of a constant load of 0.75 times bodyweight, or a cyclic sinusoidal load of 0.75 +/- 0.25 times bodyweight, before and after total labrum resection. The fluid pressure within the acetabular was measured. Following labrum resection, the initial consolidation rate was 22% greater (p = 0.02) and the final consolidation displacement was 21% greater (p = 0.02). There was no significant difference in the final consolidation rate. Loading type (constant vs. cyclic) had no significant effect on the measured consolidation behaviour. Fluid pressurisation was observed in three of the six hips. The average pressures measured were: for constant loading, 541 +/- 61 kPa in the intact joint and 216 +/- 165 kPa following labrum resection, for cyclic loading, 550 +/- 56 kPa in the intact joint and 195 +/- 145 kPa following labrum resection. The trends observed in this experiment support the predictions of previous finite element analyses. Hydrostatic fluid pressurisation within the intra-articular space is greater with the labrum than without, which may enhance joint lubrication. Cartilage consolidation is quicker without the labrum than with, as the labrum adds an extra resistance to the flow path for interstitial fluid expression. However, both sealing mechanisms are dependent on the fit of the labrum against the femoral head. (C) 2002 Elsevier Science Ltd. All rights reserved.