Suprapectoral or subpectoral position for biceps tenodesis: biomechanical comparison of four different techniques in both positions

Hypothesis The aim of this study was to compare different techniques for tenodesis of the long head of biceps tendon (LHB) in the suprapectoral and subpectoral position to test the hypothesis that using shorter screws at the subpectoral position would achieve a similar primary ultimate failure load...

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Bibliographic Details
Published in:	Journal of shoulder and elbow surgery Vol. 21; no. 1; pp. 116 - 125
Main Authors:	Patzer, Thilo, MD, Santo, Gerwin, Olender, Gavin D., MSc, Wellmann, Mathias, MD, Hurschler, Christof, PhD, Schofer, Markus D., MD, PhD
Format:	Journal Article
Language:	English
Published:	New York, NY Mosby, Inc 2012 Elsevier
Subjects:	Adult Aged biceps lesion biceps pulley lesion Biceps tenodesis Biological and medical sciences Biomechanical Phenomena Biomechanics. Biorheology Bone Screws Cadaver Diseases of the osteoarticular system Female Fundamental and applied biological sciences. Psychology Humans interference screw Male Medical sciences Middle Aged Orthopedics Photogrammetry Prosthesis Design Rotator Cuff - physiopathology Rotator Cuff - surgery SLAP lesion subpectoral suprapectoral suture anchor Suture Anchors Suture Techniques - instrumentation Tendon Injuries - physiopathology Tendon Injuries - surgery Tenodesis - methods Tissues, organs and organisms biophysics biceps pulley lesion Biceps tenodesis Biomechanical Study suture anchor Basic Science Study interference screw subpectoral biceps lesion suprapectoral SLAP lesion Biomechanics Biceps muscle Technique Comparative study Rheumatology
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Summary:	Hypothesis The aim of this study was to compare different techniques for tenodesis of the long head of biceps tendon (LHB) in the suprapectoral and subpectoral position to test the hypothesis that using shorter screws at the subpectoral position would achieve a similar primary ultimate failure load (UFL) as the longer screws at the suprapectoral position, that both types of tenodesis screws achieve comparable UFL, and that knotless suture anchor techniques can be performed at the subpectoral position in cortical bone and reach a UFL similar to tenodesis screws. Methods On 42 fresh frozen human cadavers divided into 6 groups, 4 different techniques for LHB tenodesis were performed localized 10 mm and 50 mm, respectively, distal to the entrance of the bicipital groove. Two techniques with tenodesis screws (Bio-Tenodesis screw, Biceptor) and 2 with knotless suture anchors (Bio-SwiveLock, Footprint PK) were tested. Under a 10-N preload, an axial cyclic load with 100 cycles, 1-Hz frequency, and 50-N maximal load was applied. UFL was evaluated with an axial traction of 0.2 mm/s until decrease of tension. LHB dislocation was measured by 3-dimensional photogrammetry. Results All techniques except the subpectoral Bio-SwiveLock had a dislocation <3 mm after cyclic loading. The highest mean UFL was measured for the suprapectoral Bio-Tenodesis screw (218.3 ± 59.7 N) and the lowest with the subpectoral Footprint PK (99.1 ± 16.4 N). The UFL of suture anchors were significantly lower than those of interference screws ( P < .01). UFL was not significantly different for type of interference screw, the type of suture anchor, or tenodesis localization. Different failure mechanisms were evaluated for suture anchors and interference screws. Conclusion Due to the biomechanical testings interference screws are appropriate devices for suprapectoral and subpectoral biceps tenodesis resisting cyclic loading and attaining a satisfactory, whereas the knotless suture anchors sustained a significant about 50% lower UFL, and can only be recommended conditionally for LHB tenodesis regarding primary stability.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1058-2746 1532-6500
DOI:	10.1016/j.jse.2011.01.022