A bone fixation system comprising an implant 1 having first and second sensors 3 and processing means 2 for monitoring parameters indicative of load on the bone fracture and activity levels of the patient. The implant may be an external osteosynthesis device or an internal implant such as an intermedullary rod. The system may have indicating means or output means. The sensors may comprise accelerometers, strain gauges, pressure gauges, capacitive sensors, pedometer, gyroscopes or GPS sensors. A method of monitoring a bone fracture in an individual comprises the steps of: measuring a first parameter indicative of the load on said bone fracture measuring a second parameter indicative of the activity level of said individual obtaining a plurality of values for said first and second parameters correlating said values to determine a measure of bone fracture condition monitoring a change in said correlation over time and determining a measure of the change in bone fracture condition over time.
