Work ability assessment scale (Dennis) W1: return to previous work (heavy arm activity) or heavy physical activities W2: return to previous work (sedentary) or heavy physical labor with restrictions W3: unable to return previous plus works full time in another activity W4: unable to return full time to work W5: does not work, totally disabled They were evaluated in the immediate postoperative period, 1,2,3,6,12 and 24 months.