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Am J Sports Med. 2008 Oct;36(10):1990-7. doi: 10.1177/0363546508324284.

Cyclical loading of coracoclavicular ligament reconstructions: a comparative biomechanical study.

Author information

  • 1Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, NY 10075, USA. sjleemd@aol.com

Abstract

BACKGROUND:

Reconstruction for injuries to the acromioclavicular joint remains controversial.

HYPOTHESIS:

A coracoclavicular ligament reconstruction with a semitendinosus tendon would have superior performance to the classic coracoacromial ligament transfer with or without augmentation.

STUDY DESIGN:

Controlled laboratory study.

METHODS:

Five cadaveric shoulders were used to reconstruct the coracoclavicular ligaments with 3 methods: coracoacromial ligament transfer without augmentation, coracoacromial ligament transfer augmented with No. 5 Ethibond suture, and a semitendinosus tendon. Each reconstruction was cyclically loaded at 40 N to 80 N for 2500 cycles, then from 40 N to 210 N for 2500 cycles, followed by loading to failure. The number of cycles to 50% and 100% loss of acromioclavicular joint reduction were recorded.

RESULTS:

During the 40 N to 80 N-loading cycle, the coracoacromial transfer without augmentation failed (15 +/- 16 cycles). The augmented coracoacromial ligament transfer and the semitendinosus reconstruction did not fail (P = .008). During the 40 N to 210 N-loading cycle, the augmented coracoacromial ligament transfer failed (207 +/- 399 cycles). The semitendinosus reconstruction survived through both loading cycles (P < .01).

CONCLUSION:

Coracoclavicular ligament reconstruction with a semitendinosus graft is a biomechanically superior construct in a cyclically loaded setting to a coracoacromial ligament transfer augmented with a No. 5 Ethibond suture.

CLINICAL RELEVANCE:

The semitendinosus graft is a strong, biologic option for reconstruction of the coracoclavicular ligaments.

PMID:
18832487
[PubMed - indexed for MEDLINE]
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