title: Dynamic in-vivo subtalar joint kinematics measured using a skin marker based protocol: a face validity study.
abstract: Abstract Background: The subtalar joint allows complex motion of the foot relative to the leg, the analysis of which has presented a major challenge for researchers. The considerable inter-subject variation in structure and function of the subtalar joint highlights the importance of developing a protocol to assess the kinematics in individuals rather than an overarching description of function. The use of skin mounted markers is therefore preferable, allowing the non-invasive collection of data. The aim of this study was to assess the face validity of a skin mounted marker based protocol to measure the in vivo kinematics of the subtalar joint. Methods: Thirty participants were recruited using minimal exclusion criteria. A previously tested skin mounted marker placement protocol was used in conjunction with two CODA MPX30 sensors to capture data during walking. Data produced was compared to that of previous studies that used bone mounted markers. Results:The results in all three planes represented feasible outcomes when compared to those of previous studies, the data falling within the ranges published. Patterns of movement demonstrated are similar to, although not the same as, those shown by previous investigations. Conclusions: This study did not produce patterns of movement that exactly matched those of previous investigations. The results of this study were, however, within the ranges previously published and the patterns of movement shown were feasible. The results suggest the face validity of the methodology, as a means of assessing the in vivo kinematics of the subtalar joint during the stance phase of gait.
authors: a Sheffield Teaching Hospitals NHS Foundation Trust, Community Services.
authors: Ivan
authors: I
authors: Birch
authors: Kevin
authors: K
authors: Deschamps