Two-dimensional video gait analyses in patients with congenital insensitivity to pain

Purpose: To clarify the features of gait in patients with congenital insensitivity to pain (CIP) by analyzing the video-recorded gait.Methods: Eleven patients with the diagnosis of hereditary sensory and autonomic neuropathy (HSAN) type 4 or 5 and 15 healthy participants were enrolled in this study. Gait was analyzed using two-dimensional (2D) digital video and video analysis software. Walking speed, cadence, step length, stance phase duration, and heel contact to foot flat period were compared between patients and healthy participants.Results: The results showed that walking speed and heel contact angular velocity were significantly higher (p < 0.05), and step length was significantly longer (p < 0.05) in CIP patients, especially in the younger age group.Conclusion: Young patients with CIP walked faster, with a longer step length and higher heel contact angular velocity than young control participants. These results may explain the frequency of lower extremity injuries in CIP patients.