People with patellofemoral pain have impaired functional performance, that is correlated to hip muscle capacity. (November 2019)

• Record Type: Journal Article
• Authors: Nunes, Guilherme S.; de Oliveira Silva, Danilo; Crossley, Kay M.; Serrão, Fábio Viadanna; Pizzari, Tania; Barton, Christian J.
• Is Part Of: Physical therapy in sport. Volume 40(2019)
• Page Start: 85
• Page End: 90
• Publication Date: 2019-11
• Subjects: Functionality -- Power -- Muscle strength -- Knee; Sports physical therapy -- Periodicals; Sports injuries -- Patients -- Rehabilitation -- Periodicals; Athletic Injuries -- diagnosis -- Periodicals; Athletic Injuries -- therapy -- Periodicals; Physical Therapy -- Periodicals; Sports Medicine -- Periodicals; 615.82088796
• DOI: 10.1016/j.ptsp.2019.08.010
• Languages: English
• ISSNs: 1466-853X

Abstract

Abstract: Objective: To (i) compare objective function in a range of tasks between people with and without patellofemoral pain (PFP); and (ii) evaluate the relationship of objective function with hip muscle capacity and self-reported function in people with PFP. Design: Cross-sectional. Settings: Laboratory. Participants: Thirty-two physically active people (16 with PFP and 16 controls). Main outcome measures: Functional assessments included stair climbing (time), single-legged chair stand (repetitions), step down (repetitions), forward hop for distance and side hop (repetitions). Hip abductor and extensor capacity assessments included power, endurance, isometric and dynamic strength. Self-reported function included the Kujala scale and Patellofemoral sub-scale of the Knee injury and Osteoarthritis Outcome Score (KOOS-PF). Results: The PFP group was 15% slower climbing stairs (effect size [ES] = 0.90), performed 12% fewer chair stands (ES = 0.62) and forward hopped 20% shorter (ES = 0.79) compared to controls. Lower hip muscle strength and power correlated with lower objective function (r = 0.52–0.78). Lower Kujala scores correlated with longer stair climbing time (r = −0.53). Conclusion: People with PFP have objective functional impairments, that are associated with reduced hip muscle capacity, indicating progressive resistance training may be beneficial. Absence of a strong correlation between self-reported, and objective, function indicates assessment of both when treating people with PFP is warranted. Highlights: People with PFP have objectively measured functional impairments. Objective function is associated with hip strength and power in people with PFP. Progressive resistance training may help address functional impairments.