Biceps femoris architecture and strength in athletes with a prior ACL reconstruction

Timmins, Ryan, Bourne, Matthew, Shield, Anthony, Williams, Morgan D., Lorenzen, Christian, & Opar, David A. (2016) Biceps femoris architecture and strength in athletes with a prior ACL reconstruction. Medicine and Science in Sports and Exercise, 48(3), pp. 337-345.

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Abstract

Purpose

To determine if limbs with a history of anterior cruciate ligament (ACL) injury reconstructed from the semitendinosus (ST) display different biceps femoris long head (BFlh) architecture and eccentric strength, assessed during the Nordic hamstring exercise, compared to the contralateral uninjured limb.

Methods

The architectural characteristics of the BFlh were assessed at rest and at 25% of a maximal voluntary isometric contraction (MVIC) in the control (n=52) and previous ACL injury group (n=15) using two-dimensional ultrasonography. Eccentric knee-flexor strength was assessed during the Nordic hamstring exercise.

Results

Fascicle length was shorter (p=0.001; d range: 0.90 to 1.31) and pennation angle (p range: 0.001 to 0.006: d range: 0.87 to 0.93) was greater in the BFlh of the ACL injured limb when compared to the contralateral uninjured limb at rest and during 25% of MVIC. Eccentric strength was significantly lower in the ACL injured limb than the contralateral uninjured limb (-13.7%; -42.9N; 95% CI = -78.7 to -7.2; p=0.021; d=0.51). Fascicle length, MVIC and eccentric strength were not different between the left and right limb in the control group.

Conclusions

Limbs with a history of ACL injury reconstructed from the ST have shorter fascicles and greater pennation angles in the BFlh compared to the contralateral uninjured side. Eccentric strength during the Nordic hamstring exercise of the ACL injured limb is significantly lower than the contralateral side. These findings have implications for ACL rehabilitation and hamstring injury prevention practices which should consider altered architectural characteristics.

Impact and interest:

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ID Code: 89583
Item Type: Journal Article
Refereed: Yes
DOI: 10.1249/MSS.0000000000000783
ISSN: 1530-0315
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Exercise & Nutrition Sciences
Copyright Owner: Copyright 2015 Lippincott Williams and Wilkins
Deposited On: 28 Oct 2015 01:37
Last Modified: 12 Oct 2016 18:29

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