Introduction: Functional ankle dorsiflexion range of motion measurement in the weight bearing position (weight bearing lunge test) is gaining in popularity because it mimics lower extremity function in daily physical activities. Purpose: The purpose of the study is to assess the intra-rater and the inter-rater reliability of functional ankle dorsiflexion range of motion measurement with a bent knee using a smartphone application. Methods: 32 subjects participated in the study. The measurements for the individual subject were not repeated sooner than in 24 hours. In order to assess the reliability, intraclass correlation coefficient (ICC), standard error measurement (SEM) and minimal detectable change (MDC) at the 95 % confidence interval were calculated. Results: Statistical data analysis revealed acceptable intra-rater reliability for the right ankle (ICC = 0,72) and excellent intra-rater reliability for the left ankle (ICC = 0,82). Inter-rater reliability is acceptable for the right (ICC = 0,73) and the left ankle (ICC = 0,65). Discussion and conclusion: The observed method is acceptably reliable and appropriate, when the main objective is to assess lower extremity function of an individual and when there are no contraindications. The procedure of functional ankle dorsiflexion range of motion measurement should be standardised.
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