PTOtherInternational journal of sports physical therapy2025

Analysis of Neuromuscular Control and Sensory and Psychological Anxiety Affecting Shock Absorption Capacity in Patients After Anterior Cruciate Ligament Reconstruction Surgery.

Yoshinori Komatsu, Sumiko Yamamoto

PMID 41346840

WHAT IT FOUND

Higher muscle co-contraction and worse knee position sense were linked to harder landings after ACL reconstruction.

Psychological readiness scores showed no such link. The study was small, cross-sectional, and cannot prove that treating these factors improves landing mechanics.

Key findings

01Increased quadriceps-hamstrings co-contraction and impaired knee joint proprioception are associated with reduced shock absorption capacity during single-leg drop landing.

02Scores on the psychological readiness scale did not affect the loading rate.

03The study was conducted as a single-group descriptive study without a control group.

STILL TO COME

How it was doneWhat they foundWhat it means for PTs

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What it does not show

The study was very small (16 participants), limiting generalizability and statistical power. It was a single-group descriptive study with no control group, so it cannot compare these patients to healthy individuals or those with different outcomes. Participants were assessed an average of 35.7 months post-surgery, which is much later than typical return-to-sport testing (9-12 months). The landing task may have been too easy, potentially masking relationships with psychological factors. The study is cross-sectional and correlational. It identifies associations but does not prove that reducing co-contraction or improving proprioception will cause better shock absorption. ACL tensile stress or joint forces were not directly measured; the conclusions rely on the loading rate as a proxy for injury risk.

Declared interests

The authors declare no conflicts of interest.

The easy way to misread this

Do not assume that treating co-contraction or proprioceptive deficits will automatically improve landing mechanics or reduce re-injury risk. This was a small, cross-sectional study without a control group or intervention, so it only shows an association, not a causal effect. Additionally, the lack of association with psychological readiness may be due to the late postoperative timing of the assessment rather than a true absence of influence.

Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →