Page 1/24 Comparison of the JOURNEY II Bi-Cruciate Stabilised and GENESIS II Total Knee Arthroplasty in Performance and functional Ability. A Randomised Controlled Trial (CAPAbility). The study protocol. Celia Clarke (  celia.clarke@uea.ac.uk ) University of East Anglia https://orcid.org/0000-0001-6584-9601 Valerie Pomeroy University of East Anglia Allan Clark University of East Anglia Graham Creelman Patient and Public Involvement Nicola Hancock University of East Anglia Simon Horton University of East Anglia Anne Killett University of East Anglia Charles Mann Norfolk and Norwich University Hospitals NHS Foundation Trust Estelle Payerne Norwich Clinical Trials Unit Andoni Toms Norfolk and Norwich University Hospitals NHS Foundation Trust Gareth Roberts Patient and Public Involvement Toby Smith University of Oxford Ann Marie Swart Norwich Clinical Trials Unit Iain McNamara Norfolk and Norwich University Hospitals NHS Foundation Trust Study protocol