- 作者：Thilo Patzer ; Peter Habermeyer ; Christof Hurschler ; Evgenij Bobrowitsch ; Mathias Wellmann ; Joern Kircher ; Markus D. Schofer
- 关键词：Basic Science Study ; Biomechanical Study ; Cadaver Model
- 刊名：Journal of Shoulder and Elbow Surgery
- 出版年：2012
- 出版时间：November, 2012
- 年：2012
- 卷：21
- 期：11
- 页码：1580-1587
- 全文大小：879 K
Hypothesis
Biomechanical studies have shown increased glenohumeral translation and loading of the?long head biceps (LHB) tendon after superior labrum anterior to posterior (SLAP) tears. This may explain some of the typical clinical findings, including the prevalence of humeral chondral lesions, after SLAP lesions. The first hypothesis was that SLAP repair could restore the original glenohumeral translation and reduce the increased LHB load after SLAP lesions. The second hypothesis was that SLAP repair after LHB tenotomy could significantly reduce the increased glenohumeral translation.Materials and methods
Biomechanical testing was performed on 21 fresh frozen human cadaveric shoulders with an intact shoulder girdle using a sensor-guided industrial robot to apply 20 N of compression in the joint and 50 N translational force at 0¡ã, 30¡ã, and 60¡ã of abduction. LHB loading was measured by a load-cell with 5 N and 25 N preload. Type IIC SLAP lesions were created arthroscopically, and a standardized SLAP repair was done combined with or without LHB tenotomy.
Results
No significant difference of glenohumeral translation and increased LHB load in SLAP repair compared with the intact shoulder was observed under 5 N and 25 LHB preload, except for anterior translation under 25 N LHB preload. After LHB tenotomy after SLAP lesions, no significant difference of translation was observed with or without SLAP repair.
Conclusions
SLAP repair without associated LHB tenotomy helps normalize glenohumeral translation and LHB loading. The stabilizing effect of the SLAP complex is dependent on the LHB. After biceps tenotomy, SLAP repair does not affect glenohumeral translation.