Short- Versus Long-duration Tourniquet Use During Total Knee Replacement (TKR)

To establish whether a short duration of tourniquet application (from cement fixation to cement setting)is associated with better patient functional outcomes compared to a long duration of tourniquet application (from surgical incision to cement setting). It is hypothesised that tourniquet application during cement fixation only (approximately of 20-30 min duration) will be associated with less pain and impairment than a longer tourniquet application (\> 45 minutes).