Biomechanical properties of tenotomy versus biceps knot in a cadaver model

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• 作者：Micah Lissy^a ; ^b ; Amanda Esquivel^a ; Allison Cracchiolo^a ; Stephen Lemos^a ; ^b ; ^{selemos@dmc.org" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Biceps knot ; Biceps tenodesis ; Purse string knot ; Tenotomy
• 刊名：Journal of Orthopaedics
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：13
• 期：3
• 页码：177-180
• 全文大小：567 K

文摘

Biceps tenotomy and biceps tenodesis are the primary methods of treating biceps pathology. This study describes a new technique of tenotomy with the goal of autotenodesis to give the biceps a higher load to failure and decreased chance of a Popeye deformity.

Purpose

The purpose of this study was to evaluate the strength of the “biceps knot”, which is an outlet tenodesis of the biceps tendon and compare the biomechanical properties of this technique to tenotomy.

Methods

Ten matched cadaver shoulder pairs were used. In the tenotomy group, an arthroscopic tenotomy was performed at the labral biceps junction using a narrow angled biter. For the biceps knot group, a self-retrieving suture passing device was used to pass a suture as far lateral as possible. The suture was passed from just distal to the biceps insertion on the superior labrum and tied with a standard non-sliding arthroscopic knot. The humerus and biceps tendon were rigidly fixed to a materials testing machine and cyclically loaded at 10–20 N for 100 cycles at 1 Hz. After cyclic testing, a 2 N preload was placed on the tendon and the tendon was pulled in line with the bicipital groove until failure.

Results

The peak load to failure for the biceps knot was 58.9 N (SEM 8.2 N) and 37.3 N (SEM 4.6 N) for the tenotomy group (p = 0.046). The average stiffness for the biceps knot group was 4.2 N/mm (SEM 0.4 N/mm) and 3.2 N/mm (SEM 0.2 N/mm) for the tenotomy group (p = 0.031).

Conclusion

Performing the biceps knot is a quick, easy and cost effective alternative to the current tenodesis options available.