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Differences in lower extremity kinematics between a bilateral drop-vertical jump and a single-leg step-down.
J Orthop Sports Phys Ther. 2007 May; 37(5):245-52.JO

Abstract

STUDY DESIGN

Mixed-model, repeated-measures design in a laboratory setting.

OBJECTIVES

To examine the differences in hip, knee, and ankle kinematics between a bilateral drop-vertical jump and single-leg step-down. A secondary purpose was to examine gender differences in kinematics of the tasks.

BACKGROUND

Both a drop-vertical jump and step-down task have been used to evaluate lower extremity movement and injury risk. The differences in joint angles between these tasks have not been reported.

METHODS AND MEASURES

Three-dimensional joint angles of the hip, knee, and ankle of 19 females and 18 males were evaluated with a high-speed camera system while the subjects performed a bilateral drop-vertical jump and a single-leg step-down. Maximum joint angles were compared between tasks and genders using ANOVA models. eversion (12 degrees compared to 8 degrees) (P<.0005) and hip adduction (16 degrees compared to 1 degrees) (P= .03) than the drop-vertical jump. Females had greater hip internal rotation in the step-down than in the drop-vertical jump (5 degrees compared to 2 degrees) (P = .02). When averaged across both tasks, females had greater knee abduction than males in both tasks (4 degrees compared to 0 degrees) (P<.0005).

CONCLUSIONS

The unilateral step-down task produced greater motion in the frontal and transverse planes at the ankle and hip, and would be appropriate in evaluating control of the hip. The bilateral drop-vertical jump produced greater knee abduction in both genders and may be appropriate for evaluating excessive knee abduction as a risk factor for noncontact anterior cruciate ligament injury, for example. The 2 tasks appear to challenge the neuromuscular system in different manners, and both should continue to be used in the investigation of injury risk.

Authors+Show Affiliations

Department of Human Movement Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, USA. jearl@uwm.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17549953

Citation

Earl, Jennifer E., et al. "Differences in Lower Extremity Kinematics Between a Bilateral Drop-vertical Jump and a Single-leg Step-down." The Journal of Orthopaedic and Sports Physical Therapy, vol. 37, no. 5, 2007, pp. 245-52.
Earl JE, Monteiro SK, Snyder KR. Differences in lower extremity kinematics between a bilateral drop-vertical jump and a single-leg step-down. J Orthop Sports Phys Ther. 2007;37(5):245-52.
Earl, J. E., Monteiro, S. K., & Snyder, K. R. (2007). Differences in lower extremity kinematics between a bilateral drop-vertical jump and a single-leg step-down. The Journal of Orthopaedic and Sports Physical Therapy, 37(5), 245-52.
Earl JE, Monteiro SK, Snyder KR. Differences in Lower Extremity Kinematics Between a Bilateral Drop-vertical Jump and a Single-leg Step-down. J Orthop Sports Phys Ther. 2007;37(5):245-52. PubMed PMID: 17549953.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differences in lower extremity kinematics between a bilateral drop-vertical jump and a single-leg step-down. AU - Earl,Jennifer E, AU - Monteiro,Sarika K, AU - Snyder,Kelli R, PY - 2007/6/7/pubmed PY - 2007/7/20/medline PY - 2007/6/7/entrez SP - 245 EP - 52 JF - The Journal of orthopaedic and sports physical therapy JO - J Orthop Sports Phys Ther VL - 37 IS - 5 N2 - STUDY DESIGN: Mixed-model, repeated-measures design in a laboratory setting. OBJECTIVES: To examine the differences in hip, knee, and ankle kinematics between a bilateral drop-vertical jump and single-leg step-down. A secondary purpose was to examine gender differences in kinematics of the tasks. BACKGROUND: Both a drop-vertical jump and step-down task have been used to evaluate lower extremity movement and injury risk. The differences in joint angles between these tasks have not been reported. METHODS AND MEASURES: Three-dimensional joint angles of the hip, knee, and ankle of 19 females and 18 males were evaluated with a high-speed camera system while the subjects performed a bilateral drop-vertical jump and a single-leg step-down. Maximum joint angles were compared between tasks and genders using ANOVA models. eversion (12 degrees compared to 8 degrees) (P<.0005) and hip adduction (16 degrees compared to 1 degrees) (P= .03) than the drop-vertical jump. Females had greater hip internal rotation in the step-down than in the drop-vertical jump (5 degrees compared to 2 degrees) (P = .02). When averaged across both tasks, females had greater knee abduction than males in both tasks (4 degrees compared to 0 degrees) (P<.0005). CONCLUSIONS: The unilateral step-down task produced greater motion in the frontal and transverse planes at the ankle and hip, and would be appropriate in evaluating control of the hip. The bilateral drop-vertical jump produced greater knee abduction in both genders and may be appropriate for evaluating excessive knee abduction as a risk factor for noncontact anterior cruciate ligament injury, for example. The 2 tasks appear to challenge the neuromuscular system in different manners, and both should continue to be used in the investigation of injury risk. SN - 0190-6011 UR - https://www.unboundmedicine.com/medline/citation/17549953/Differences_in_lower_extremity_kinematics_between_a_bilateral_drop_vertical_jump_and_a_single_leg_step_down_ L2 - http://www.jospt.org/doi/full/10.2519/jospt.2007.2202?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -