ArticlePhysical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine2025
Quadriceps femoris strength deficits early in rehabilitation after ACL reconstruction identify risk of future contralateral ACL injury following return to sport in young athletes: A Preliminary analysis.
Article in Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
2 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Hop Test Performance is Associated with Return-to-Sport but Shows Limited Association with Reinjury after Anterior Cruciate Ligament Reconstruction: A Systematic Review and Meta-Analysis.Journal of sports science & medicine · 2026Pooled it
- Evidence Summary for Early-Stage Rehabilitation After Anterior Cruciate Ligament Reconstruction.Journal of multidisciplinary healthcare · 2026Review
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Authors and funding
5 authors.
Funding
Abstract
objectiveTo test the relationship between quadriceps femoris (QF) strength 3 months after ACLR and long-term outcomes after ACLR.
designProspective, case-cohort.
settingLaboratory.
participants51 (mean age:15.6 ± 2.2 yrs) athletes after ACLR.
main outcome measures1) "Early" (13.7 ± 2.1 wks) post-ACLR testing included an isokinetic QF strength assessment. 2) At medical clearance to RTS (8.4 ± 1.6 months), isokinetic QF strength, hop testing, and patient-reported outcome data were collected. Associations between early QF strength and RTS measures, as well as 2nd ACL injury in the 36 months after RTS were assessed.
results20 participants (39 %) sustained a 2nd ACL injury after RTS. Early QF strength limb symmetry (LSI) was moderately correlated with measures at RTS clearance (p < 0.05). Participants who failed to achieve ≥80 % QF LSI at the early testing session (23/51; 45.1 %) had 4 times higher odds (OR = 4.4; 95 %CI:1.0-19.2; p = 0.04) of sustaining a contralateral 2nd ACL injury in the 36 months following RTS clearance.
conclusionEarly QF LSI positively associates with RTS measures. Early QF strength symmetry <80 % was associated with increased risk of contralateral ACL injury after RTS. Greater QF strength deficits early in rehabilitation may be a biomarker of poor short- and long-term outcomes after ACLR.
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