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Am J Sports Med. 2011 Jan;39(1):188-94. doi: 10.1177/0363546510383394. Epub 2010 Nov 12.

Biomechanical evaluation of 3 arthroscopic self-cinching stitches for shoulder arthroscopy: the lasso-loop, lasso-mattress, and double-cinch stitches.

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1
University of Alabama at Birmingham, USA.

Abstract

BACKGROUND:

The tissue-suture interface remains the most common site of failure in rotator cuff repairs. Improving stitch strengths may lead to lower failure rates.

PURPOSE:

To compare biomechanical properties of 3 self-cinching stitches to the simple, mattress, modified Mason-Allen, and massive cuff stitches.

STUDY DESIGN:

Controlled laboratory study.

METHODS:

In sum, 336 sheep infraspinatus tendon grafts were randomized among 7 stitches. Each graft was cyclically loaded on a mechanical testing system from 5 to 30 N for 20 cycles and then loaded to failure. A mixed-effect multivariate regression model was used to test significance of suture type on cyclic elongation, peak-to-peak displacement, and ultimate load. Estimated means and standard deviations are reported from the regression model.

RESULTS:

Ultimate load for the simple stitch was significantly lower than for the other stitches. The lasso-loop and mattress stitch demonstrated similar ultimate loads. The double-cinch had a higher ultimate load than the lasso-loop or mattress stitch, although it was significantly weaker than the modified Mason-Allen, lasso-mattress, and massive cuff. The lasso-mattress had a superior ultimate load to the modified Mason-Allen and a similar ultimate load to the massive cuff stitch. One significant difference was found in cyclic elongation (1.42 mm for the simple to 1.80 mm for the double-cinch), and the cinching mechanism accounted for 0.2-mm higher elongation.

CONCLUSION:

Self-cinching stitches lead to superior tissue-holding strength at the tissue-suture interface when compared with equivalent non-self-cinching stitches. Self-cinching stitches have greater elongation values. How these differences in cyclic elongation clinically influence gap formation at the repair site is unknown. The greater displacement seen in the self-cinching stitches is a potential concern because minimal gap formation is desired for a strong repair.

CLINICAL RELEVANCE:

The lasso-loop stitch is a stronger alternative to a simple stitch, and the double-cinch and lasso-mattress stitches are stronger alternatives to a mattress stitch.

PMID:
21076013
DOI:
10.1177/0363546510383394
[Indexed for MEDLINE]
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