Relationship Between Lateral Tibial Posterior Slope and Tibiofemoral Kinematics During Simulated Jump Landings in Male Cadaveric Knees.

Autor:	Baek, So Young, Beaulieu, Mélanie L., Wojtys, Edward M., Ashton-Miller, James A.
Předmět:	KNEE physiology TIBIA physiology FEMUR physiology MEDICAL cadavers RESEARCH CONFIDENCE intervals RESEARCH methodology CROSS-sectional method MAGNETIC resonance imaging REGRESSION analysis COMPARATIVE studies ANTERIOR cruciate ligament injuries DESCRIPTIVE statistics RESEARCH funding JUMPING STATISTICAL correlation MOTION capture (Human mechanics) DATA analysis software KINEMATICS GROUND reaction forces (Biomechanics) DIGITAL video WEIGHT-bearing (Orthopedics)
Zdroj:	Orthopaedic Journal of Sports Medicine; Jun2023, Vol. 11 Issue 6, p1-8, 8p
Abstrakt:	Background: It is not known mechanistically whether a steeper lateral posterior tibial slope (LTS) leads to an increase in anterior tibial translation (ATT) as well as internal tibial rotation (ITR) during a given jump landing. Hypothesis: A steeper LTS will result in increased ATT and ITR during simulated jump landings when applying knee compression, flexion, and internal tibial torque of increasing severity. Study Design: Descriptive laboratory study. Methods: Seven pairs of cadaveric knees were harvested from young male adult donors (mean ± SD; age, 25.71 ± 5.53 years; weight, 71.51 ± 4.81 kg). The LTS of each knee was measured by a blinded observer from 3-T magnetic resonance images. Two sets of 25 impact trials of ∼700 N (1× body weight [BW] ±10%) followed by 2 sets of 25 trials of 1400 N (2× BW ±10%) were applied to a randomly selected knee of each pair. Similarly, on the contralateral knee, 2 sets of 25 impact trials of ∼1800 N (2.5× BW ±10%) followed by 2 sets of 25 trials of ∼2100 N (3× BW ±10%) were applied. Three-dimensional knee kinematics, including ATT and ITR, were measured at 400 Hz using optoelectronic motion capture. Two-factor linear mixed effect models were used to determine the relationship of LTS to ATT and ITR as impact loading increased. Results: As LTS increased, so did ATT and ITR during increasingly severe landings. LTS had an increasing effect on ATT (coefficient, 0.50; 95% CI, 0.29-0.71) relative to impact force (coefficient, 0.52; 95% CI, 0.50-0.53). ITR was proportional to LTS (coefficient, 1.36; 95% CI, 0.80-1.93) under increasing impact force (coefficient, 0.49; 95% CI, 0.47-0.52). For steeper LTS, the increase in ITR was proportionally greater than the increase in ATT. Conclusion: In male knee specimens, a steeper LTS significantly increased ATT and ITR during jump landings. Clinical Relevance: Increases in ITR and ATT during jump landings lead to increased strain on the anterior cruciate ligament and are therefore associated with greater risk of ligament failure. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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