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Comparison of Knee Muscle Strength and Ankle Dorsiflexion Range of Motion Between Standing Workers With and Without Patellofemoral Pain Syndrome

한국전문물리치료학회지 2020년 27권 4호 p.241 ~ 249
원영수, 안선희, 김준희, 곽견태, 권오윤,
소속 상세정보
원영수 ( Weon Young-soo ) - Yonsei University Graduate School Department of Physical Therapy
안선희 ( Ahn Sun-Hee ) - Kinetic Ergocise Based on Movement Analysis Laboratory
김준희 ( Kim Jun-Hee ) - Kinetic Ergocise Based on Movement Analysis Laboratory
곽견태 ( Gwak Gyeon-Tae ) - Yonsei University Graduate School Department of Physical Therapy
권오윤 ( Kwon Oh-Yun ) - Yonsei University College of Health Science Department of Physical Therapy

Abstract


Background: Prolonged standing during work causes a lower extremity pain and disorders.
Patellofemoral pain syndrome (PFPS) is one of the common diagnoses of the knee pain. Although the etiology of PFPS is not completely understood, it is considered to be multifactorial.

Objects: The purpose of this study was to investigate difference in strength of knee muscles, quadriceps:hamstring muscles strength ratio (Q:H ratio), asymmetry ratio of knee muscles strength and dorsiflexion range of motion (ROM) between standing workers with and without PFPS.

Methods: Twenty-eight standing workers with PFPS and 26 age-, height-, and weightmatched standing workers without PFPS participated in this study. A tension sensor measured knee muscle strength, and motion sensor measured dorsiflexion ROM. The asymmetry ratio of knee muscles was calculated by a specific formula using the knee muscles strength of the dominant side and the sound side. An independent t-test was used to identify significant differences in the strength, ROM, Q:H ratio, and asymmetry ratio between the PFPS and normal groups.

Results: The standing worker with PFPS have significantly lower dorsiflexion ROM (p < 0.000) and higher asymmetry ratio of the hamstring muscles strength (p < 0.000) compare to the standing worker without PFPS. No significant differences were seen in the strength of quadriceps muscle and hamstring muscles, Q:H ratio, and asymmetry ratio of quadriceps muscle strength.

Conclusion: There was a significant difference in the asymmetry ratio of the isometric hamstring muscle strength. This finding suggests that the asymmetry ratio of isometric hamstring muscle strength may be more important than measuring only the hamstring muscle strength of the PFPS side. Furthermore, the results of this study showed a significant difference in dorsiflexion ROM between the standing industrial workers with and without PFPS. Dorsiflexion ROM and isometric hamstring muscle strength should be considered when evaluating the subjects with PFPS.

키워드

Hamstring muscles; Knee joint; Patellofemoral pain syndrome; Quadriceps muscle

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