老年女性膝骨关节炎患者膝屈伸等速肌力及其与BMI的相关性研究

Isokinetic Muscle Strengths of Knee Flexors and Extensors and Their Relation to BMI in Elderly Women with Knee Osteoarthritis

目的:探讨膝骨关节炎患者(KOA)膝关节屈伸等速肌力特点及其与BMI之间的相关性。方法:利用等动肌力测试系统测试47名老年女性(KOA组25名、对照组22名)的膝关节肌力。另外,通过计算两组受试者的BMI,考察该指标与膝关节屈伸肌力之间的相关性。结果:KOA组膝关节伸展绝对峰力矩显著小于对照组(P<0.05),屈伸相对峰力矩均显著小于对照组(P<0.05),而KOA组的相对峰力矩屈伸比显著大于对照组(P<0.05)。两组受试者BMI与膝关节屈伸相对峰力矩呈显著负相关(P<0.01)。结论:膝骨关节炎可降低老年女性膝关节伸肌肌力和屈肌肌力,且对伸肌肌力的影响更甚。并且可显著影响膝关节的稳定性。无论有无膝骨关节炎,随着BMI的增加,老年女性膝关节肌力均下降,且膝骨关节炎患者下降更加明显。

Objective To explore the relationship of isokinetic muscle strengths of knee flexors and extensors with BMI in elderly women with knee osteoarthritis（KOA）. Methods Forty seven elderly women,including 25 KOA patients and 22 healthy people,were tested by isokinetic dynamometry. The absolute peak torque（a PT）and relative peak torque（r PT）of knee were recorded. Results a PT of extensor was significant smaller in KOA women than healthy people（P〈0.05）. Both r PT of flexor and extensor in KOA women were significantly smaller than health people（P〈0.05）,and the ratio of flexion r PT to extension r PT in KOA women was significantly greater than health people（P〈0.05）. There were significant negative relationships between BMI and r PT of flexors and extensors in both groups. Conclusion Knee osteoarthritis could reduce quadriceps and hamstring muscle strengths in the elderly women,and significantly affected the knee joint stability. With increasing of BMI,the knee muscle strength of the elderly women reduces,especially those with knee osteoarthritis.