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Comparative Study
. 2018 Sep;33:89-95.
doi: 10.1016/j.ptsp.2018.07.007. Epub 2018 Jul 17.

Implications of Knee Crepitus to the Overall Clinical Presentation of Women With and Without Patellofemoral Pain

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Comparative Study

Implications of Knee Crepitus to the Overall Clinical Presentation of Women With and Without Patellofemoral Pain

Danilo de Oliveira Silva et al. Phys Ther Sport. .

Abstract

Objectives: Compare anthropometric characteristics, function, kinesiophobia, catastrophism and knee extensor strength between women (i) with PFP and crepitus (PFPcrepitus); (ii) with PFP and no crepitus (PFPNOcrepitus); (iii) without PFP and crepitus (Pain-freecrepitus); and (iv) without PFP and no crepitus (Pain-freeNOcrepitus).

Design: Cross-sectional.

Setting: Laboratory study.

Participants: 65 women with PFP and 51 pain-free women.

Main outcome measures: Objective assessment of knee crepitus, forward step-down and single leg hop tests; knee extensor strength tests; and subjective ratings of function, kinesiophobia, pain catastrophising and knee stiffness.

Results: Crepitus was more common in women with PFP (50.7%) compared to those without (33.3%) (χ(1)2=4.17;p=0.031). PFPcrepitus and PFPNOcrepitus groups had lower self-reported function; and higher kinesiophobia, catastrophism and knee stiffness compared to Pain-freecrepitus and Pain-freeNOcrepitus groups (p < 0.001). PFPcrepitus, PFPNOcrepitus and Pain-freecrepitus groups had lower functional performance compared to the Pain-freeNOcrepitus group (p < 0.040). PFPcrepitus and PFPNOcrepitus groups had lower isometric, concentric and eccentric knee extensor strength compared to the Pain-freeNOcrepitus group (p < 0.041), but not the pain-freecrepitus group. PFPcrepitus presented higher BMI than other groups (p = 0.001).

Conclusion: Kinesiophobia, catastrophism, knee stiffness, strength and physical function are all impaired in women with PFP, regardless of crepitus. In pain-free women, crepitus was associated with poorer objective function.

Keywords: Function; Kinesiophobia; Knee pain; Strength.

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