The research team have consulted with patients on the feasibility of participating in the study at all and in particular about the demands of attending the appointments for functional assessment. The commitment for the majority of the study is the same whether patients are involved in the research or not but nevertheless the research team will emphasise the need for attendance. However, rehabilitation for patients living in Exeter is undertaken at the RD+E site. For some patients who live in the surrounding areas, rehabilitation could normally be undertaken in their local community hospital using current protocols. Ideally the research team would like all patients to attend for rehabilitation at the RD+E so as to standardise care. However, this will not always be possible as patients may have logistical difficulty travelling to Exeter when the study population is drawn from a wide geographical area. If patients do not wish or cannot travel to Exeter for this however, they will have to come to Exeter on 3 extra separate occasions for the KT100 functional test. Attendance at all time frames is critical for completion of the functional outcome assessment. This is both the study primary outcome measure but also the safety net of ensuring neither study arm is failing catastrophically. It was stressed by the patient representatives that the patients need to be fully informed of the commitment required should they agree to take part.