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Landing mechanics between noninjured women and women with anterior cruciate ligament reconstruction during 2 jump tasks.

ABSTRACT: Women with anterior cruciate ligament reconstruction have different neuromuscular strategies than noninjured women during functional tasks after ligament reconstruction and rehabilitation.Landing from a jump creates high loads on the knee creating dynamic instability in women with anterior cruciate ligament reconstruction, whereas noninjured women have stable knee landing mechanics.Controlled laboratory study.Fifteen noninjured women and 13 women with anterior cruciate ligament reconstruction performed 5 trials of a single-legged 40-cm drop jump and 2 trials of a 20-cm up-down hop task. Multivariate analyses of variance were used to compare hip and knee joint kinematics, knee joint moments, ground-reaction forces, and electromyographic findings between the dominant leg in noninjured women and reconstructed leg in women with anterior cruciate ligament reconstruction.No statistically significant differences between groups were found for peak hip and knee joint angles for the drop jump task. Statistically significant differences in neuromuscular activity (P = .001) and anterior-posterior knee shear forces (P < .001) were seen in women with anterior cruciate ligament reconstruction compared with noninjured women in the drop jump task. However, no statistically significant differences (P > .05) between groups were found for either peak hip and knee joint angles, peak joint kinetics, or electromyographic findings during the up-down hop task.Women with anterior cruciate ligament reconstruction have neuromuscular strategies that allow them to land from a jump similar to healthy women, but they exhibit joint moments that could predispose them to future injury if they participate in sports that require jumping and landing.

SUBMITTER: Ortiz A

PROVIDER: S-EPMC2744382 | biostudies-literature | 2008 Jan

REPOSITORIES: biostudies-literature

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Landing mechanics between noninjured women and women with anterior cruciate ligament reconstruction during 2 jump tasks.

Ortiz Alexis A Olson Sharon S Libby Charles L CL Trudelle-Jackson Elaine E Kwon Young-Hoo YH Etnyre Bruce B Bartlett William W

The American journal of sports medicine 20071016 1

<h4>Background</h4>Women with anterior cruciate ligament reconstruction have different neuromuscular strategies than noninjured women during functional tasks after ligament reconstruction and rehabilitation.<h4>Hypothesis</h4>Landing from a jump creates high loads on the knee creating dynamic instability in women with anterior cruciate ligament reconstruction, whereas noninjured women have stable knee landing mechanics.<h4>Study design</h4>Controlled laboratory study.<h4>Methods</h4>Fifteen noni ...[more]

PMID: 17940142

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Project description:CONTEXT:? Despite an increase in the literature, few definitive guidelines are available to determine when an athlete has been fully rehabilitated after anterior cruciate ligament reconstruction (ACLR). OBJECTIVE:? To examine countermovement jump and isokinetic dynamometry measures to (1) identify which measures can best distinguish between ACLR and control participants and (2) provide normative values for identified measures in young adult male multidirectional field-sport athletes. DESIGN:? Cross-sectional study. SETTING:? Orthopaedic hospital. PATIENTS OR OTHER PARTICIPANTS:? Young adult male multidirectional field-sport athletes (n = 118) who had undergone unilateral patellar-tendon graft ACLR at least 6 months earlier and healthy male participants (n = 44) with no previous knee injury. INTERVENTION(S):? Single-legged countermovement jump (SL CMJ). MAIN OUTCOME MEASURE(S):? Three-dimensional biomechanical analysis of the SL CMJ and mean peak concentric knee-extension and -flexion torque using isokinetic dynamometry (ISO) were compared in the 2 groups. A stepwise logistic regression was carried out to identify the best predictors of ACLR- or control-group membership (SL CMJ height, limb symmetry index, peak power, joint power contribution, ISO peak torque, limb symmetry index variables). RESULTS:? The control group differed strongly from the ACLR group in isokinetic knee-extension peak torque (d = -1.33), SL CMJ performance (d > 0.4), and limb symmetry measures in both ISO and jump outcomes (d > 1.1). The combination of measures from both ISO and SL CMJ identified group membership with an accuracy of 89%. CONCLUSIONS:? Rehabilitation of ACLR patients may be complete when they achieve isokinetic knee-extension peak torque of 260% (±40%) body mass, SL CMJ performance of >17 cm (±4 cm), and reach-limb symmetry measures of >90% in both strength and jump outcomes. The outcomes in the control group can inform return-to-play criteria for young adult male multidirectional field-sport athletes after ACLR.

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Landing mechanics between noninjured women and women with anterior cruciate ligament reconstruction during 2 jump tasks.

Publications

Landing mechanics between noninjured women and women with anterior cruciate ligament reconstruction during 2 jump tasks.

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