Universität zu Köln

Hackl, Michael, Nacov, Julia, Kammerlohr, Sandra, Staat, Manfred ORCID: 0000-0003-4363-6570, Buess, Eduard, Leschinger, Tim, Mueller, Lars P. and Wegmann, Kilian (2021). Intratendinous Strain Variations of the Supraspinatus Tendon Depending on Repair Technique: A Biomechanical Analysis Regarding the Cause of Medial Cuff Failure. Am. J. Sports Med., 49 (7). S. 1847 - 1854. THOUSAND OAKS: SAGE PUBLICATIONS INC. ISSN 1552-3365

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Abstract

Background: Double-row (DR) and transosseous-equivalent (TOE) techniques for rotator cuff repair offer more stability and promote better tendon healing compared with single-row (SR) repairs and are preferred by many surgeons. However, they can lead to more disastrous retear patterns with failure at the medial anchor row or the musculotendinous junction. The biomechanics of medial cuff failure have not been thoroughly investigated thus far. Purpose: To investigate the intratendinous strain distribution within the supraspinatus tendon depending on repair technique. Study Design: Controlled laboratory study. Methods: Twelve fresh-frozen cadaveric shoulders were used. The intratendinous strain within the supraspinatus tendon was analyzed in 2 regions-(1) at the footprint at the greater tuberosity and (2) medial to the footprint up to the musculotendinous junction-using a high-resolution 3-dimensional camera system. Testing was performed at submaximal loads of 40 N, 60 N, and 80 N for intact tendons, after SR repair, after DR repair, and after TOE repair. Results: The tendon strain of the SR group differed significantly in both regions from that of the intact tendons and the TOE group at 40 N (P <= .043) and from the intact tendons, the DR group, and the TOE group at 60 N and 80 N (P <= .048). SR repairs showed more tendon elongation at the footprint and less elongation medial to the footprint. DR and TOE repairs did not provide significant differences in tendon strain when compared with the intact tendons. However, the increase in tendon strain medial to the footprint from 40 N to 80 N was significantly more pronounced in the DR and TOE group (P <= .029). Conclusion: While DR and TOE repair techniques more closely reproduced the strains of the supraspinatus tendon than did SR repair in a cadaveric model, they showed a significantly increased tendon strain at the musculotendinous junction with higher loads in comparison with the intact tendon.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hackl, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Nacov, Julia UNSPECIFIED UNSPECIFIED UNSPECIFIED Kammerlohr, Sandra UNSPECIFIED UNSPECIFIED UNSPECIFIED Staat, Manfred UNSPECIFIED orcid.org/0000-0003-4363-6570 UNSPECIFIED Buess, Eduard UNSPECIFIED UNSPECIFIED UNSPECIFIED Leschinger, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Lars P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wegmann, Kilian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-576427
DOI:	10.1177/03635465211006138
Journal or Publication Title:	Am. J. Sports Med.
Volume:	49
Number:	7
Page Range:	S. 1847 - 1854
Date:	2021
Publisher:	SAGE PUBLICATIONS INC
Place of Publication:	THOUSAND OAKS
ISSN:	1552-3365
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DOUBLE-ROW REPAIR; ARTHROSCOPIC SINGLE-ROW; SUTURE TECHNIQUE; RETEAR PATTERNS; ROTATOR; TEARS; FIXATION; RECONSTRUCTION; STRENGTH Multiple languages Orthopedics; Sport Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57642