Orthosis or exoskeleton system with modular elements

An orthosis or exoskeleton system comprising:

• two or more body mounting modules and one or more function modules;
• the or each body mounting module of the one or more body mounting modules being structured and arranged to, in use, be mounted to respective first and second body parts of a patient, the first and second body parts being either side of a joint of the patient;
• and
• the or each function module of the two or more function modules being structured and arranged to provide a sensing function;
• the or each body mounting module of the one or more body mounting modules and the or each function module of the two or more function modules each having an interfacing structure such that any of said one or more body mounting modules is interchangeably couplable to any of said two or more function modules, wherein
• the one or more body mounting modules and the two or more function modules each have a transfer interface such that information may be transferred between one respective body mounting module and one respective function module when coupled,
• wherein
• the one or more body mounting modules comprises first and second brace assemblies, the first brace assembly pivotably coupled to the second brace assembly using a hinge;
• wherein
• the transfer interface includes a magnet arranged to rotate with the first brace assembly and a Hall Effect sensor arranged on the one respective function module to detect the rotation of the magnet, wherein
• the sensing function is dependent on an angle between the first and second body part.