Inclusion Criteria:  Participant is willing and able to give informed consent for participation in the study Male or Female, aged 55 years or above Primary unilateral KR as a scheduled procedure Deemed by study screening tool developed to be at risk of poor outcome Happy to allow physiotherapy teams to attend their home to deliver the Community based rehabilitation programme if randomised to the intervention arm.  Exclusion Criteria:  Any absolute contraindications to exercise Severe cardiovascular or pulmonary disease (New York Heart Association III-IV) Severe dementia, assessed using the hospital dementia screening tool Rheumatoid arthritis Further lower limb arthroplasty surgery planned within 12 months. Serious perioperative complications