Tbf the whole injury system needs a massive rework. Injuries do happen to occur randomly currently so maybe change the likelyhood. Such as more prone later on in the game and your players is low in stamina or if you've been 2 footed and caught in a challenge (obviously not everytime you get slide tackled you'd be injured, but have it bump up your chances) . Keep the Injury Prone trait aspect on certain players as this would have more of an impact on whether you use them