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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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Quadriceps Strength and Kinesiophobia Predict Long-Term Function After ACL Reconstruction: A Cross-Sectional Pilot

Joshua J Van Wyngaarden1, Cale Jacobs2, Katherine Thompson3

  • 1College of Health Sciences, Department of Physical Therapy, University of Kentucky, Lexington, Kentucky.

Sports Health
|November 17, 2020
PubMed
Summary

Maximal isometric quadriceps strength is key for long-term knee function after anterior cruciate ligament reconstruction (ACLR). Addressing kinesiophobia also improves patient-reported outcomes, suggesting targeted training can enhance recovery.

Keywords:
ACL ReconstructionACLRkinesiophobiakneequadriceps

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Many patients experience long-term knee dysfunction following anterior cruciate ligament reconstruction (ACLR).
  • Identifying key physical performance measures linked to long-term outcomes post-ACLR remains unclear.

Purpose of the Study:

  • To investigate the association between physical performance measures and long-term patient-reported outcomes after ACLR.
  • To determine if quadriceps strength is the primary predictor of functional recovery.

Main Methods:

  • A cross-sectional study involving 40 patients an average of 10.9 years post-ACLR.
  • Patients completed validated questionnaires (LEFS, IKDC, KOOS, TSK-17) and underwent physical performance tests (quadriceps strength, step-down, hop tests).
  • Multivariate regression analyses controlled for time since surgery, age, and kinesiophobia levels.

Main Results:

  • Maximal isometric quadriceps strength was the only physical performance measure significantly associated with all patient-reported outcomes (IKDC, KOOS Sport, KOOS QoL, LEFS).
  • Hop tests and step-down tests did not show significant associations with patient-reported outcomes.
  • Kinesiophobia (TSK-17) was significantly associated with all outcomes, while time since surgery was not.

Conclusions:

  • Isometric quadriceps strength and kinesiophobia are significant predictors of long-term patient-reported outcomes after ACLR.
  • Interventions focusing on improving quadriceps strength and managing kinesiophobia may enhance long-term functional recovery in ACLR patients.