Purpose
The purpose of our study was to compare biomechanically a long head biceps tenodesis
using an all soft tissue biceps sling technique versus an interference screw technique.
Methods
Six paired fresh frozen shoulder specimens were separated into 2 groups. One group
used an all soft tissue biceps sling technique for tenodesis. The other group used
the interference screw technique for subpectoral tenodesis of the long head biceps
tendon. Specimens in both groups were sequentially loaded for 200 cycles, and the
difference between the initial and final displacements were recorded. Specimens were
then loaded to failure. Load and mode of failure were recorded.
Results
The mean displacement of all specimens undergoing the sling technique was significantly
less than that of the interference technique at 3.0 mm (±0.80) versus 5.0 mm (±1.08)
(P < .05). The biceps sling technique had a higher mean ultimate failure load (UFL)
than did the interference screw tenodesis (216.9 N ± 91.6 v 171.7 N ± 101.4), although this was not statistically significant (P = .63). In the interference screw technique, 4 specimens failed at the tenodesis
site by either tearing or complete pullout, whereas 2 failed at the biceps myotendinous
junction. In the sling technique, 4 specimens failed at the biceps myotendinous junction,
whereas one specimen tore at the tenodesis site and one detached the pectoralis tendon
insertion from the humerus. One specimen in the biceps sling technique and 2 specimens
in the interference screw technique failed before completing all 200 cycles.
Conclusions
The results of this biomechanical study show that the biceps sling technique has construct
stability similar to that of the interference screw technique.
Clinical Relevance
The biceps sling may be a reasonable alternative for treating symptomatic pathologic
conditions of the long head biceps tendon.
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Article Info
Publication History
Published online: May 31, 2013
Accepted:
April 3,
2013
Received:
September 1,
2012
Footnotes
Supported in part by a resident research grant from Orthopaedic Research and Education Foundation, Rosemont, Illinois . The interference screws and suture used in the study were donated by Arthrex, Naples, Florida. The authors report that they have no conflicts of interest in the authorship and publication of this article.
Identification
Copyright
© 2013 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
