Reliability of a smartphone goniometer app compared with traditional goniometer for measuring passive motion at the first metatarsophalangeal joint

Adequate sagittal plane motion of the first metatarsalphalangeal joint (1^st MTPJ) is important during normal gait and goniometric measurement is commonly used as a diagnostic and outcome assessment tool for 1^st MTPJ pathology. We aimed to determine the intra and inter-rater reliability of a universal plastic goniometer and a smartphone application when measuring dorsiflexion at the 1^st MTPJ. …