Department of Rehabilitation and Care, Seijoh University, 2-172 Fukinodai, Tokai, 476-8588, Aichi, Japan.
BMC Musculoskelet Disord. 2023 May 4;24(1):348. doi: 10.1186/s12891-023-06367-0.
The relationship between inferior patellar mobility (IPM) and knee flexion angle has yet to be elucidated. This study aimed to develop quantitative IPM measurement methods and clarify the relationship between IPM and knee flexion angle in community-dwelling older females.
This was a cross-sectional study. Overall, 128 healthy older women (age 65-79 years) were recruited from the community to evaluate the relationship between IPM and knee flexion angle. This study was performed between May 2015 and December 2017. The reference value of and sex differences in IPM were evaluated in 205 healthy young adults aged between 19 and 21 years. IPM was compared between healthy older and young women and was objectively measured using our specially designed patellofemoral arthrometer (PFA). Patellar mobility was calculated by normalization to body height. IPM reliability was assessed before all measurements.
Intraclass correlation coefficients for intratester and intertester reliabilities varied from 0.87 to 0.99. The normal range based on two standard deviations of inferior patellar displacement/body height was 5.9-13.5% (young men), 5.1-14.3% (young women), and 1.2-8.8% (older women). IPM was significantly lower in older than young women (P < 0.001). There was a significant positive correlation (r = 0.72 and P < 0.01) between IPM and knee flexion angle in healthy older women unable to flex the knee joint fully.
Our PFA has good intratester and intertester reliability. The results suggest that IPM decreases with aging in women. IPM and knee flexion angle are correlated among older women unable to flex the knee joint fully.
Not applicable.
髌下活动度（IPM）与膝关节弯曲角度之间的关系尚未阐明。本研究旨在开发定量 IPM 测量方法，并阐明社区居住的老年女性中 IPM 与膝关节弯曲角度之间的关系。
这是一项横断面研究。共有 128 名健康的老年女性（65-79 岁）从社区招募，以评估 IPM 与膝关节弯曲角度之间的关系。本研究于 2015 年 5 月至 2017 年 12 月进行。评估了 205 名 19-21 岁健康年轻成年人的 IPM 的参考值和性别差异。比较了健康老年和年轻女性之间的 IPM，并使用我们专门设计的髌股关节 arthrometer（PFA）进行客观测量。通过归一化到身高来计算髌下活动度。在所有测量之前评估 IPM 的可靠性。
内测试者和外测试者可靠性的组内相关系数范围为 0.87 至 0.99。基于下髌骨位移/身高的两个标准差的正常范围为 5.9-13.5%（年轻男性）、5.1-14.3%（年轻女性）和 1.2-8.8%（老年女性）。IPM 在老年女性中明显低于年轻女性（P<0.001）。在不能完全弯曲膝关节的健康老年女性中，IPM 与膝关节弯曲角度之间存在显著的正相关（r=0.72，P<0.01）。
我们的 PFA 具有良好的内测试者和外测试者可靠性。结果表明，女性的 IPM 随年龄增长而降低。在不能完全弯曲膝关节的老年女性中，IPM 与膝关节弯曲角度相关。
不适用。
