The effect of an inclined landing surface on biomechanical variables during a jumping task
Document Actions
Cyclical loading of coracoclavicular ligament reconstructions: a comparative biomechanical study.
by
Lee SJ, Keefer EP, McHugh MP, Kremenic IJ, Orishimo KF, Ben-Avi S, Nicholas SJ.
—
last modified
2009-10-09 15:17
Am J Sports Med. 2008 Oct;36(10):1990-7.
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.