Knee biomechanics during impact landing understanding injury mechanisms and developing prevention strategies 2

CHAPTER RESULTS ~ They say any landing you can walk away from is a good one ~ Alan Shepard 69 5.1 STAGE A – Understanding Biomechanics of Landing 5.1.1 Regression relationships of knee kinematics, kinetics and energetics with landing height a. Time profiles of knee kinematics, kinetics and energetics Representative GRF data indicated the typical two-peak profile commonly observed during landing (Fig. 5.1.1). The peak GRF was achieved within 20% of the landing phase; similar observations were noted for peak knee flexion angular velocity and knee joint power. Fig. 5.1.1: Representative profiles of resultant ground reaction force (GRF), knee flexion angle, knee flexion angular velocity and knee joint power during landing phase. 70 b. Peak ground reaction force Between peak resultant GRF and landing height, a strong exponential regression relationship (R2=0.90-0.99, p[...]... -1.194 [0.393] 35.1 -1 .20 0^ [0.303] 35.3 -1.009 [0.311] 29 .7 Singleleg -2. 065*,# [0.719] 42. 9 -0.548 [0 .28 5] 11.4 -2. 199*,# [0.304] 45.7 Doubleleg -0. 127 + [0.066] 66.7 -0.055+ [0.081] 29 .0 -0.008 [0.016] 4.3 Singleleg -0.140+ [0. 124 ] 36.6 -0 .23 2**,# [0.094] 60.7 -0.010 [0.010] 2. 7 85 5 .2 STAGE B – Investigation of Knee Injury Mechanisms 5 .2. 1 Porcine specimens during simulated landing impact a Peak compressive... for both landing techniques (Fig 5.1.13B) The knee showed greater peak abduction (p . during the landing phase of double-leg landing and single-leg landing from 0.3-m and 0.6-m heights. ** significant difference compared to double-leg landing at 0.3-m height and single-leg landing. Fig. 5.1.10: Knee joint power during the landing phase of double-leg landing and single-leg landing from 0.3-m and 0.6-m heights. * significant difference compared to single-leg landing at 0.3-m. (p<0.05) during single-leg landing than double-leg landing. On the other hand, the knee extensors showed higher eccentric work (p<0.05) during double-leg landing than single-leg landing.