Using trunk kinematics to predict kinetic asymmetries during double-leg jump-landings in collegiate athletes following anterior cruciate ligament reconstruction.
Yu Song, Ling Li, Megan A Jensen and 1 others
PMID 36934474WHAT IT FOUND
Side-to-side hip position during jump-landings predicted 27% to 38% of the variance in force and knee moment asymmetries in athletes recovering from ACL reconstruction.
Simple video analysis of hip shift may help screen for risky loading patterns, though it does not replace force plates.
Key findings
01Medial-lateral hip positions significantly correlated with both vertical ground reaction force and knee extension moment asymmetries during the jumping and landing phases.
02Hip position explained 27% to 38% of the variance in kinetic asymmetries, which is less predictive than during squats.
03Lateral trunk bending angles did not correlate with kinetic asymmetries, suggesting athletes did not use trunk lean as a primary compensation strategy.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The sample size was small (15 athletes, 26 assessments), and some participants were tested twice, which may bias the results. The study only included collegiate athletes, so findings may not apply to non-athletes or other populations. There was no control group of uninjured athletes to compare baseline asymmetries. The prediction of kinetic asymmetry from hip position was moderate (27-38% variance), meaning it misses a significant portion of the actual force differences.
Declared interests
The authors declared no financial or personal conflicts of interest.
The easy way to misread this
Do not assume that a neutral hip position guarantees symmetrical forces. The regression lines showed positive intercepts, meaning even when the hips were centered, asymmetries in force and knee moments persisted. This suggests hip position alone is an incomplete measure of re-injury risk.