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Digital Deformity Assessment Prior to Percutaneous Flexor Tenotomy for Managing Diabetic Foot Ulcers on the Toes.
Journal of Foot and Ankle Surgery 2019 May
The aim of this study is to evaluate the prevalence of digital deformities in patients with diabetes mellitus according to the McGlamry classification and relate the types of digital deformities with the history of digital ulcer. A cross-sectional study was performed in the diabetic foot unit between September 2016 and September 2017. All consecutive patients were classified by digital deformities according to the McGlamry classification (flexor stabilization, flexor substitution, and extensor substitution) using slow-motion videos. In all patients, the Foot Posture Index 6 was performed and previous toe ulceration, toe calluses, and nail dystrophy were evaluated. A total of 142 feet were evaluated, in which 29 (20.27%) feet did not show dynamic deformities, 65 (57.5%) were classified as flexor stabilization, 9 (8%) as flexor substitution, and 39 (34.5%) as extensor substitution. In total, 23% the feet with previous ulcer were classified as extensor substitution. A previous toe ulcer on the tip (p = .033; confidence interval [CI] 1.06 to 4.99; odds ratio [OR] 2.3), pronated foot according to the Foot Posture Index 6 (p = .048; 95% CI 0.9 to 8.9; OR 2.9), and callus on the tip (p = .002; 95% CI 1.47 to 6.41; OR 3.07) were associated with flexor stabilization deformities. Flexor stabilization, associated with the pronated foot, was the most prevalent dynamic deformity. Extensor substitution was present in approximately 40% of the patients and in 20% of the patients with previous ulcer, in whom flexor tenotomy could aggravate the digital deformity. An evaluation of dynamic deformities during gait should be included as a presurgical assessment to achieve successful surgical results.
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