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Title of Journal: Arch Orthop Trauma Surg

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Abbravation: Archives of Orthopaedic and Trauma Surgery

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Springer Berlin Heidelberg

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DOI

10.1002/asmb.627

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ISSN

1434-3916

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Effect of single and doublerow rotator cuff repa

Authors: M H Baums B Schminke A Posmyk N Miosge HM Klinger S Lakemeier
Publish Date: 2014/11/22
Volume: 135, Issue: 1, Pages: 111-118
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Abstract

The clinical superiority of the doublerow technique is still a subject of controversial debate in rotator cuff repair We hypothesised that the expression of different collagen types will differ between doublerow and singlerow rotator cuff repair indicating a faster healing response by the doublerow techniqueTwentyfour mature female sheep were randomly assembled to two different groups in which a surgically created acute infraspinatus tendon tear was fixed using either a modified single or doublerow repair technique Shoulder joints from female sheep cadavers of identical age bone maturity and weight served as untreated control cluster Expression of type I II and III collagen was observed in the tendontobone junction along with recovering changes in the fibrocartilage zone after immunohistological tissue staining at 1 2 3 6 12 and 26 weeks postoperativelyExpression of type III collagen remained positive until 6 weeks after surgery in the doublerow group whereas it was detectable for 12 weeks in the singlerow group In both groups type I collagen expression increased after 12 weeks Type II collagen expression was increased after 12 weeks in the doublerow versus singlerow group Clusters of chondrocytes were only visible between week 6 and 12 in the doublerow groupThe study demonstrates differences regarding the expression of type I and type III collagen in the tendontobone junction following doublerow rotator cuff repair compared to singlerow repair The healing response in this acute repair model is faster in the doublerow group during the investigated healing period

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