Fig. 1.

Schedule of enrolment, interventions and assessments for the UK FROST trial. ^aPatients expected to receive allocated surgical procedure within 18 weeks of randomisation followed by post-procedural physiotherapy. ^bPhysiotherapy logbooks completed recording delivery of Early Structured Physiotherapy (ESP) and post-procedural physiotherapy. ^cThe primary outcome only will be collected on the day treatment starts, i.e. on the day of the patient’s operation or, for patients allocated to ESP, on the day when the steroid injection is given or their first visit to physiotherapy, whichever is the first to be delivered. It will then be collected again 6 months later. ^dReminders sent to sites upon return of physiotherapy logbooks and at 1 year to confirm whether any (further) changes in patient status or adverse events need reporting