Authors: Guillaume Bacle JeanMarc Gregoire Frédéric Patat Philippe Clavert Gonzague de Pinieux Jacky Laulan Walid Lakhal Luc Favard
Publish Date: 2016/06/10
Volume: 39, Issue: 2, Pages: 119-126
Abstract
Forty fresh cadaver dissections and histologic analysis were performed Three groups of specimens were distinguished according to the rotator cuff tendon status 1 intact rotator cuff 2 supraspinatus tendon tears with intact ISP tendon and 3 both supraspinatus and ISP tendons torn Muscle fiber organization and muscle and tendon length were recorded ISP and TM innervation and fiber structure were studiedISP muscles were composed of three groups of fiber organized in two planes two superficial groups with mean pennation angles of respectively 27° ± 4° and 23° ± 3° with respect to the axis of the central tendon of the underlying group TMs were thick fusiform muscles showing a parallel organization 26 specimens 67 had aponeuroses isolating the TM with a mean length of 52 ± 27 cm Rotator cuff lesions were associated with relatively greater ISP tendon than muscle length Innervation of the ISP muscle comprised 2–4 main branches from the suprascapular nerve and that of the TM 1 branch from the axillary nerveISP muscle body morphology derives from three groups of fibers in two planes The TM has a parallel organization Several nerve branches innervate the ISP muscle whereas only one supplies the TM The limits between the two muscles bodies consist of an aponeurotic fascia in twothirds of cases
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