Glenohumeral stability from concavity-compression: A quantitative analysis.
Glenohumeral stability from concavity-compression: A quantitative analysis.
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DOI：
10.1016/s1058-2746(09)80134-1
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发表时间：
1993-01-01
影响因子：
3
通讯作者：
Matsen, F A 3rd
中科院分区：
文献类型：
--
作者：
Lippitt, S B;Vanderhooft, J E;Matsen, F A 3rd
本研究的目的是确定肱骨头压缩到关节盂内的程度，以使其在平移力的作用下保持稳定。使用10具新鲜冷冻的正常尸体盂肱关节，其中盂唇被保存。在垂直于关节盂表面的方向上向肱骨头施加50 N的压缩载荷。然后施加不断增加的切向力，直到股骨头在关节盂唇上脱位。在关节盂周围45 °的8个不同方向上检查脱位时的切向力。然后，在增加100 N的压缩载荷的情况下，检查凹面压缩稳定性。最后，在切除盂唇后，重复50和100 N压缩载荷的方案。将肱骨头凹陷压缩到关节盂中是最有效的稳定机制。在盂唇完整的情况下，肱骨头可抵抗高达60%压缩载荷的切向力。关节盂周围的压缩稳定程度各不相同，上下方向的压缩稳定程度最大。这可能是由于这些方向上的关节盂深度更大。切除盂唇使压缩稳定的有效性降低约20%。这些结果表明，凹面压缩可能是一个重要的机制，提供稳定的关节盂肱关节活动的中期，其中胶囊和韧带松弛。有效性因存在完整的盂唇而增强。
The purpose of this research was to determine the degree to which compression of the humeral head into the glenoid concavity stabilizes it against translating forces. Ten normal fresh-frozen cadaver glenohumeral joints in which the labrum was preserved were used. A compressive load of 50 N was applied to the humeral head in a direction perpendicular to the glenoid surface. Increasing tangential forces were then applied until the head dislocated over the glenoid lip. The tangential force at dislocation was examined for eight different directions, 45° apart around the glenoid. Concavity-compression stability was then examined for an increased compressive load of 100 N. Finally, the protocol with 50 and 100 N of compressive load was repeated after the glenoid labrum was excised. Concavity-compression of the humeral head into the glenoid is a most efficient stabilizing mechanism. With the labrum intact the humeral head resisted tangential forces of up to 60% of the compressive load. The degree of compression stabilization varied around the circumference of the glenoid with the greatest magnitude superiorly and inferiorly. This may be attributed to the greater glenoid depth in these directions. Resection of the glenoid labrum reduced the effectiveness of compression stabilization by approximately 20%. These results indicate that concavity-compression may be an important mechanism for providing stability in the mid-range of glenohumeral motion where the capsule and ligaments are lax. The effectiveness is enhanced by the presence of an intact glenoid labrum.