Division of Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia.
J Orthop Sports Phys Ther. 2012 Jul;42(7):642-8. doi: 10.2519/jospt.2012.3841. Epub 2012 Jan 25.
Controlled laboratory study.
To investigate the reliability and concurrent validity of photographic measurements of hallux valgus angle compared to radiographs as the criterion standard.
Clinical assessment of hallux valgus involves measuring alignment between the first toe and metatarsal on weight-bearing radiographs or visually grading the severity of deformity with categorical scales. Digital photographs offer a noninvasive method of measuring deformity on an exact scale; however, the validity of this technique has not previously been established.
Thirty-eight subjects (30 female, 8 male) were examined (76 feet, 54 with hallux valgus). Computer software was used to measure hallux valgus angle from digital records of bilateral weight-bearing dorsoplantar foot radiographs and photographs. One examiner measured 76 feet on 2 occasions 2 weeks apart, and a second examiner measured 40 feet on a single occasion. Reliability was investigated by intraclass correlation coefficients and validity by 95% limits of agreement. The Pearson correlation coefficient was also calculated.
Intrarater and interrater reliability were very high (intraclass correlation coefficients greater than 0.96) and 95% limits of agreement between photographic and radiographic measurements were acceptable. Measurements from photographs and radiographs were also highly correlated (Pearson r = 0.96).
Digital photographic measurements of hallux valgus angle are reliable and have acceptable validity compared to weight-bearing radiographs. This method provides a convenient and precise tool in assessment of hallux valgus, while avoiding the cost and radiation exposure associated with radiographs.
对照实验室研究。
研究与作为标准的 X 光片相比，跖骨外翻角度的摄影测量的可靠性和同时效度。
跖骨外翻的临床评估涉及到在负重 X 光片上测量第一跖骨和跖骨之间的对齐情况，或者使用分类量表目测评估畸形的严重程度。数字照片提供了一种在精确尺度上测量畸形的非侵入性方法；然而，这种技术的有效性尚未得到证实。
对 38 名受试者（30 名女性，8 名男性）进行了检查（76 只脚，54 只患有跖骨外翻）。计算机软件用于从双侧负重前后足 X 光片和照片的数字记录中测量跖骨外翻角度。一名检查者在 2 周内对 76 只脚进行了 2 次测量，第二名检查者对 40 只脚进行了 1 次测量。通过组内相关系数研究可靠性，通过 95%一致性界限研究有效性。还计算了 Pearson 相关系数。
内部和内部检查者的可靠性非常高（组内相关系数大于 0.96），并且摄影测量和放射测量之间的 95%一致性界限是可以接受的。照片和 X 光片的测量值也高度相关（Pearson r = 0.96）。
与负重 X 光片相比，跖骨外翻角度的数字摄影测量具有可靠性和可接受的有效性。这种方法为评估跖骨外翻提供了一种方便而精确的工具，同时避免了 X 光片相关的成本和辐射暴露。
