Department of Radiology, Bispebjerg-Frederiksberg Hospital, Copenhagen, Denmark.
Furesø-reumatologerne, Copenhagen, Farum, Denmark.
Skeletal Radiol. 2023 Dec;52(12):2387-2397. doi: 10.1007/s00256-023-04352-1. Epub 2023 May 3.
To assess test-retest reliability and correlation of weight-bearing (WB) and non-weight-bearing (NWB) cone beam CT (CBCT) foot measurements and Foot Posture Index (FPI) MATERIALS AND METHODS: Twenty healthy participants (age 43.11±11.36, 15 males, 5 females) were CBCT-scanned in February 2019 on two separate days on one foot in both WB and NWB positions. Three radiology observers measured the navicular bone position. Plantar (ΔNAV) and medial navicular displacements (ΔNAV) were calculated as a measure of foot posture changes under loading. FPI was assessed by two rheumatologists on the same two days. FPI is a clinical measurement of foot posture with 3 rearfoot and 3 midfoot/forefoot scores. Test-retest reproducibility was determined for all measurements. CBCT was correlated to FPI total and subscores.
Intra- and interobserver reliabilities for navicular position and FPI were excellent (intraclass correlation coefficient (ICC) .875-.997). In particular, intraobserver (ICC .0.967-1.000) and interobserver reliabilities (ICC .946-.997) were found for CBCT navicular height and medial position. Interobserver reliability of ΔNAV was excellent (ICC .926 (.812; .971); MDC 2.22), whereas the ΔNAV was fair-good (ICC .452 (.385; .783); MDC 2.42 mm). Using all observers' measurements, we could calculate mean ΔNAV (4.25±2.08 mm) and ΔNAV (1.55±0.83 mm). We demonstrated a small day-day difference in ΔNAV (0.64 ±1.13mm; p<.05), but not for ΔNAV (0.04 ±1.13mm; p=n.s.). Correlation of WBCT (WB navicular height - ΔNAV) with total clinical FPI scores and FPI subscores, respectively, showed high correlation (ρ: -.706; ρ: -.721).
CBCT and FPI are reliable measurements of foot posture, with a high correlation between the two measurements.
评估负重（WB）和非负重（NWB）锥形束 CT（CBCT）足部测量和足弓指数（FPI）的重测信度和相关性。
20 名健康参与者（年龄 43.11±11.36，15 名男性，5 名女性）于 2019 年 2 月在一只脚上分别在两天的 WB 和 NWB 位置进行了两次 CBCT 扫描。三位放射科医生测量了舟状骨的位置。距骨下（Δ NAV）和内侧距骨位移（Δ NAV）的计算作为负重下足弓变化的测量。两名风湿病医生在两天内评估了 FPI。FPI 是一种临床足部姿势测量，包括 3 个后足和 3 个中足/前足评分。所有测量均确定了重测可重复性。CBCT 与 FPI 总分和子评分相关。
舟骨位置和 FPI 的观察者内和观察者间可靠性均为优（组内相关系数（ICC）.875-.997）。特别是，观察者内（ICC.0.967-1.000）和观察者间可靠性（ICC.946-.997）对于 CBCT 距骨高度和内侧位置。Δ NAV 的观察者间可靠性为优（ICC.926（.812；.971）；MDC 2.22），而 Δ NAV 为中-良（ICC.452（.385；.783）；MDC 2.42mm）。使用所有观察者的测量值，我们可以计算出平均Δ NAV（4.25±2.08mm）和Δ NAV（1.55±0.83mm）。我们发现 Δ NAV 有较小的日间差异（0.64 ±1.13mm；p<.05），但 Δ NAV 无差异（0.04 ±1.13mm；p=n.s.）。WBCT（WB 距骨高度-Δ NAV）与总临床 FPI 评分和 FPI 子评分的相关性分别显示出高度相关性（ρ：-.706；ρ：-.721）。
CBCT 和 FPI 是可靠的足部姿势测量方法，两者之间具有高度相关性。
