The Relationship Between Quadriceps/hamstring Strength and Anterior Tibial Shear Force During a Jump Landing Task

Objective: To evaluate relationships between Anterior Tibial Shear Force (ATSF) and eccentric quadriceps strength (Quad_Ecc), concentric hamstring strength (Ham_Con), and the Quad_Ecc/Ham_Con ratio. Design: Correlational. Setting: Research laboratory. Participants: Thirty-three healthy female recreational athletes. Main Outcome Measure(s): ATSF was measured during a landing task via inverse dynamics. Quad_Ecc and Ham_Con were assessed at 60˚/s, 180˚/s, and 300˚/s using isokinetic dynamometry. Results: Quad_Ecc and Ham_Con were not significantly related to ATSF at any testing velocity (p > 0.05). Quad_Ecc/Ham_Con was significantly related to ATSF at 60˚/s (r = 0.529, p = 0.005) and 180˚/s (r = 0.556, p = 0.003). Conclusion: Quad_Ecc and Ham_Con in isolation are not significantly related to ATSF. However, when considered as a functional ratio, these strength measures are predictors of ATSF. This suggests that high Quad_Ecc/Ham_Con ratios may predispose female athletes to higher ATSF and ACL injury risk

Keywords: knee injury; ACL; torque; strength ratios

Year	Entry
1999	Hewett TE, Lindenfeld TN, Riccobene JV, Noyes FR. The effect of neuromuscular training on the incidence of knee injury in female athletes: a prospective study. Am J Sports Med. November–December 1999;27(6):699-706.
1999	Li G, Rudy TW, Sakane M, Kanamori A, Ma CB, Woo SL-Y. The importance of quadriceps and hamstring muscle loading on knee kinematics and in-situ forces in the ACL. J Biomech. April 1999;32(4):395-400.
2001	Malinzak RA, Colby SM, Kirkendall DT, Yu B, Garrett WE. A comparison of knee joint motion patterns between men and women in selected athletic tasks. Clin Biomech (Bristol, Avon). June 2001;16(5):438-445.
2004	Pflum MA, Shelburne KB, Torry MR, Decker MJ, Pandy MG. Model prediction of anterior cruciate ligament force during drop-landings. Med Sci Sports Exer. November 2004;36(11):1949-1958.
2006	Yu B, Lin C-F, Garrett WE. Lower extremity biomechanics during the landing of a stop-jump task. Clin Biomech (Bristol, Avon). March 2006;21(3):297-305.
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Year

Entry

1999

Hewett TE, Lindenfeld TN, Riccobene JV, Noyes FR. The effect of neuromuscular training on the incidence of knee injury in female athletes: a prospective study. Am J Sports Med. November–December 1999;27(6):699-706.

1999

Li G, Rudy TW, Sakane M, Kanamori A, Ma CB, Woo SL-Y. The importance of quadriceps and hamstring muscle loading on knee kinematics and in-situ forces in the ACL. J Biomech. April 1999;32(4):395-400.

2001

Malinzak RA, Colby SM, Kirkendall DT, Yu B, Garrett WE. A comparison of knee joint motion patterns between men and women in selected athletic tasks. Clin Biomech (Bristol, Avon). June 2001;16(5):438-445.

2004

Pflum MA, Shelburne KB, Torry MR, Decker MJ, Pandy MG. Model prediction of anterior cruciate ligament force during drop-landings. Med Sci Sports Exer. November 2004;36(11):1949-1958.

2006

Yu B, Lin C-F, Garrett WE. Lower extremity biomechanics during the landing of a stop-jump task. Clin Biomech (Bristol, Avon). March 2006;21(3):297-305.