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Relationships of the musculocutaneous nerve and the coracobrachialis during coracoid abutment procedure (Latarjet procedure)

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Abstract

Purpose

The aim of this study was first to define first the anatomical relationships between the musculocutaneous nerve and the coracobrachialis, and then the induced modifications of these relationships by a preglenoid transposition of the vertical part of the coracoid process.

Materials and methods

Twenty-one embalmed adult trunks and upper limb were dissected. First the coracobrachialis and the musculocutaneous nerve were identified through a deltopectoral approach. We measured the distances between the lateral cord of the brachial plexus and the entry point of the nerve, between the inferior tip of the tip of the coracoid process and the penetration of the nerve or its twigs, and finally the angle between the general axis of the coracobrachialis and the axis of the musculocutaneous nerve. The same measures were performed after the coracoid bone block abutment.

Results

Proximal motor branches destined to the coracobrachialis varied from 0 to 3. Mean distance between the lateral cord of the brachial plexus and entry point of the nerve into the muscle was 47.2 mm before and 48.43 mm after the coracoid transfer. Mean angulations between the nerve and the muscle was 121° before and 136° after the transfer of the coracoid process. Mean distance between the inferior tip of the coracoid process and entry point of the nerve into the muscle was 55.7 mm, reduced to 48.6 mm after the coracoid transposition. Finally, the distance between the tip of the coracoid and the first motor twig entering the coracobrachialis was less than 50 mm in 75% of the cases with a mean value of 40.6 mm.

Conclusions

Lesion of the musculocutaneous nerve is a known complication of the coracoid bone block abutment procedure (Latarjet–Bristow). From this study we know that they are due to lengthening of the nerve and modification of the penetration angle of the nerve into the coracobrachialis. We also infer that some motor nerve destined to the coracobrachialis might be damaged during the proximal medial release of the muscle after the detachment of the pectoralis minor muscle.

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Authors and Affiliations

  1. Faculté de Médecine, Institut of Normal Anatomy, 4 rue Kirschleger, 6785, Strasbourg, France

    Philippe Clavert, J.-C. Lutz, R. Wolfram-Gabel & J. L. Kahn

  2. Shoulder and Elbow Service, CCOM, 10 Avenue Baumann, 67400, Illkirch-Graffenstaden, France

    Philippe Clavert & J. F. Kempf

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  1. Philippe Clavert
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  2. J.-C. Lutz
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  3. R. Wolfram-Gabel
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  4. J. F. Kempf
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  5. J. L. Kahn
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Correspondence to Philippe Clavert.

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Clavert, P., Lutz, JC., Wolfram-Gabel, R. et al. Relationships of the musculocutaneous nerve and the coracobrachialis during coracoid abutment procedure (Latarjet procedure). Surg Radiol Anat 31, 49–53 (2009). https://doi.org/10.1007/s00276-008-0426-2

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  • DOI: https://doi.org/10.1007/s00276-008-0426-2

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