Ensuring functional recovery and early complication detection after Total Hip Arthroplasty (THA) requires reliable follow-up systems. Digital health technologies offer new opportunities to support patients remotely and improve clinical decision-making. This thesis presents My Mobility, a mobile client–server application designed to assist patients and orthopaedic clinicians during post-operative rehabilitation. Through continuous and multimodal telemonitoring, the system aims to reduce the incidence of early dislocation, one of the leading causes of THA revision surgery. The telemonitoring process integrates three complementary data sources: videos recording the patient’s weekly performance in hip mobility exercises, quantitative gait metrics extracted via smartphone integration with Google Fit, and responses to a validated recovery questionnaire.