There are many adult conditions such as stroke, Parkinson’s disease and multiple sclerosis that affect functional ability and performance. These conditions can strike at any age therefore patients may have to live with them for many years. Motion analysis can improve the quality of life of such patients. Sometimes the interventions suggested from an analysis are very small (e.g. fine tuning an orthosis) but the impact and benefits to the individual can be huge. Some of our studies, in collaboration with Honorary Professor Sam El Jamal, involved the assessment of gait of those patients with subthalmic electrodes implantation to assess and optimise their shuffling gait.