Atilla B, Caglar O, Pekmezci M, Buyukasik Y, Tokgozoglu AM, Alpaslan M. Pre-operative flexion contracture determines the functional outcome of haemophilic arthropathy treated with total knee arthroplasty. Haemophilia. 2012 May;18(3):358–63. doi: 10.1111/j.1365-2516.2011.02695.x. PMID: 22103453.