Associates of Physical Function and Pain with Lower Muscle Strength and Trunk Muscle Endurance in Subjects with Patellofemoral Pain Syndrome

Articles in Press

Document Type : RESEARCH PAPER

Authors

1 Department of physiotherapy. Ahvaz Jundishapur University of Medical Sciences

2 Department of Physiotherapy, Ahvaz Jundishapur University of Medical Sciences

3 Deparment of Physiotherapy, Ahvaz Jundishapur University of Medical Sciences

10.22038/abjs.2025.84895.3873

Abstract

Objectives: This study investigated the association of knee pain severity and functional performance with hip and knee muscle strength and trunk endurance in individuals suffering from patellofemoral pain syndrome (PFPS).

Methods: This cross-sectional study included 50 participants diagnosed with PFPS. An 11-point visual analog scale (VAS) was used to assess knee pain severity, and the Anterior Knee Pain Scale (AKPS) quantified functional ability. Hip extensors, abductors, medial and lateral rotators, and knee extensors were tested for strength using a handheld dynamometer. Trunk endurance was assessed through plank tests in anterior, posterior, and lateral positions.

Results: A significant inverse relationship was identified between pain intensity and functional performance (r = -0.504, p < 0.001). Body mass index (BMI) exhibited a negative association with performance (B = -7.459, p = 0.021). Knee extensor strength (B = 0.156, p < 0.0001) and lateral plank endurance (B = 1.457, p = 0.002) showed positive associations with functional performance.

Conclusions: Higher pain levels and BMI were associated with poorer function in individuals with PFPS. Conversely, stronger quadriceps and greater lateral core endurance were linked to better functional outcomes.

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The Archives of Bone and Joint Surgery

Articles in Press, Accepted Manuscript
Available Online from 17 September 2025

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History

  • Receive Date: 06 January 2025
  • Revise Date: 11 July 2025
  • Accept Date: 09 July 2025

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