Inclusion Criteria:  Patients suitable for posterolateral approach total hip arthroplasty Able to give informed consentAble to return to study site for follow-up BMI under 35  Exclusion Criteria:  Previous hip procedure in the previous twelve months Previous knee surgery other than arthroscopy and medial menisectomy in the last twelve months Symptomatic foot, knee, contralateral hip or spinal pathology Any medical condition limiting normal ambulation e.g. stroke, Parkinsons disease, severe lymphedema, advanced cardiac disease Unable to read and understand English and follow verbal and visual instructions unless they can bring a relative or friend to all study assessments to act as a translator