I broke mine sliding on ice in a turn. Did not need a replacement but doctor said breaking a hip is delicate because of major blood supply area to hip can cause problems. I was fortunate 3 stainless steel screws. I was back on an indoor trainer after 5 days from surgery very easy. Only allowed to turn cranks. I did that and some self therapy and praise the Lord was able to go back to running in 15 weeks. I got out on the bike outside after for a ride on day 58. Scared the daylights out of me and still does because any time you go over something can happen. I was not going fast and did not even hit by head but landed right on side of hip.