A patient compliance monitor (10) for monitoring compliance of a patient to a treatment regime for treatment of a medical condition, the patient compliance monitor comprising measurement means (12) for measuring an external physical parameter acting on a limb of the said patient, the external physical parameter having an influence on the medical condition experienced by said limb; recording means (14) for recording over a period of time data representative of the physical parameter; and comparative means for comparing the recorded data with data indicative of the treatment regime to determine patient compliance to the treatment regime.