Correlations of Single-Leg Performance Tests to Patient-Reported Outcomes after Primary Anterior Cruciate Ligament Reconstruction

Chelsey Roe, Cale Jacobs, Paul Kline, Kathryn Lucas, Darren Johnson, Mary L. Ireland, Christian Lattermann, Brian Noehren

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Objective:To determine the relationship between patient-reported outcomes (PROs) to the single-leg step-down test (SLSD) and the Y-balance anterior reach (YB-A) 6 months after primary anterior cruciate ligament reconstruction (ACLR).Design:Cross-sectional.Setting:Laboratory.Participants:Sixty-six patients 6 months after ACLR participated.Interventions:Patients performed the SLSD, YB-A, and completed PROs after ACLR.Main Outcome Measures:Patients completed the International Knee Documentation Committee Score (IKDC), the Lysholm Activity Scale, the Tampa Scale of Kinesiophobia (TSK-11), and the Knee Injury and Osteoarthritis Outcome Score (KOOS)-Symptom, -Sport, and -Quality of Life (QOL) subscales. The SLSD requires subjects to complete as many single-leg step-downs as possible in 60 seconds, and the YB-A involves reaching anteriorly on a single limb. Pearson product moment correlations were used to assess relationships between the YB-A and SLSD performance to each PRO.Results:Single-leg step-down test symmetry was significantly correlated with the TSK-11 (r = -0.70), KOOS-Sport (r = 0.40), -Symptom (r = 0.46), and -QOL (r = 0.42). The YB-A symmetry was significantly correlated with the KOOS-Symptom (r = 0.30) and KOOS-Sport (r = 0.30).Conclusions:Single-leg step-down test performance demonstrated stronger relationships to patient-reported knee function than the YB-A. Furthermore, the SLSD symmetry was strongly correlated with fear of movement. The SLSD provides a robust method for clinicians to assess dynamic knee function and may aid in identifying patients who could benefit from intervention to reduce fear of movement or reinjury.

Original languageEnglish
Pages (from-to)E265-E270
JournalClinical Journal of Sport Medicine
Issue number5
StatePublished - Sep 1 2021

Bibliographical note

Publisher Copyright:
© 2021 Lippincott Williams and Wilkins. All rights reserved.


  • ACL
  • knee
  • return to sport
  • single-leg performance

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine


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