Relationship Between Single-Leg Vertical Jump and Drop Jump Performance, and Return to Sports After Primary Anterior Cruciate Ligament Reconstruction Using Hamstring Graft.
Shunsuke Ohji, Junya Aizawa, Kenji Hirohata and 4 others
PMID 39371195WHAT IT FOUND
Athletes who failed to return to their pre-injury level after ACL reconstruction showed greater asymmetry in single-leg drop jump reactive strength index.
Standard hop distance and vertical jump height did not differ between groups, suggesting explosive plyometric testing captures deficits that traditional criteria miss.
Key findings
01The No-RTS group displayed lower LSI in RSI compared to the Yes-RTS group in the single-leg drop jump.
02No significant differences were observed between groups in the LSI for single-leg hop or single-leg vertical jump.
03The No-RTS group exhibited higher knee pain NRS scores during sports activities compared to the Yes-RTS group.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study only included patients with hamstring tendon autografts, so findings may not apply to those with patellar tendon or quadriceps tendon grafts. Return-to-sport status was based on self-reported performance intensity and a yes/no question, which can be subjective. The study did not include patient-reported outcome measures like the IKDC, leaving subjective knee function undetermined. Arm swing was not standardized across all tasks (restricted in jumps, not in hops), which can affect performance metrics. The Bonferroni correction for multiple comparisons may have increased the risk of type II errors (false negatives).
Declared interests
The authors certify that there are no conflicts of interest with any financial organization.
The easy way to misread this
Do not assume that passing standard hop and vertical jump tests guarantees a successful return to pre-injury performance. The study found no difference in these metrics between those who returned and those who did not, whereas drop jump RSI asymmetry was the distinguishing factor.