“…Increasing age [I-61 significant pre-existing medical problems [ 1,641, impaired mobility prior to injury [3,7] and confusional states [3,4,9] have been consistently correlated with increased mortality. Male sex [2,6,7], and increasing delays between injury and surgery [I] have also been claimed to be correlated with mortality but this has been disputed [5,8]. Many surgeons believe that there is a differential mortality rate dependent on the type of prosthesis used, and patients undergoing hemi-arthroplasty or total hip replacement are commonly excluded from controlled trials for this reason [l, lo].…”