Kinetic Asymmetry During a Repetitive Tuck Jump Task in Athletes with a History of Anterior Cruciate Ligament Reconstruction.
Adam W VanZile, Matthew J Snyder, Emily A Watkins and 3 others
PMID 34631248WHAT IT FOUND
Nine athletes repeatedly loaded their uninjured leg more during tuck jumps after ACL reconstruction.
This happened on all five landings analyzed. For return-to-sport work, check for offloading of the reconstructed leg.
Key findings
01Impact forces and loading rates were higher for the uninvolved limb across all five landings analyzed.
02Propulsive forces were higher for the uninvolved limb across all five land-and-jump cycles analyzed.
03Initial contact timing differences did not change among the five landings.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only nine athletes were studied, so the finding is limited to a small sample. Only the first five land-and-jump cycles were analyzed, so asymmetry could change later. The tuck jump task may not match repetitive landing and jumping in sport. There was no comparison group of uninjured athletes. Athletes had isolated ACL injuries and had already been cleared to return to sport, so findings may not apply to earlier rehab or other injuries. The study measured forces and timing, not new ACL injuries or function over time.
Declared interests
The authors declared no conflicts of interest. The study received no funding.
The easy way to misread this
Do not read this as proof that tuck jumps are unsafe or that the uninvolved limb is certain to be injured next. The study observed nine athletes, analyzed only the first five landings, and did not measure new injuries or test a treatment.