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Validity and Reliability of Hallux Valgus Angle Measured on Digital Photographs.
Nix S, Russell T, Vicenzino B, Smith M. J Orthop Sports Phys Ther. 2012 Jan 25
Quote:
STUDY DESIGN:
Controlled laboratory study.
OBJECTIVES:
To investigate the reliability and concurrent validity of photographic measurements of hallux valgus angle compared to radiographs as the criterion standard.
BACKGROUND:
Clinical assessment of hallux valgus involves measuring alignment between the first toe and metatarsal on weight-bearing radiographs or grading the severity of deformity visually using categorical scales. Digital photographs offer a non-invasive method of measuring deformity on an exact scale; however, the validity of this technique has not previously been established.
METHODS:
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 (ICCs) and validity by 95% limits of agreement (LA). Pearson's correlation coefficient was also calculated.
RESULTS:
Intrarater and interrater reliability were very high (ICCs > 0.96) and 95% LA between photographic and radiographic measurements were acceptable. Measurements from photographs and radiographs were also highly correlated (Pearson's r = 0.96).
CONCLUSIONS:
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 x-rays
Validity and Reliability of Hallux Valgus Angle Measured on Digital Photographs
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