I suspect that many athletes with recurring injury histories suffer from structural imbalances and/or inefficient body mechanics. People obsess over pitching mechanics because of the volatility and attrition rate of the position, but the same kinds of problems can plague position players too. For example, a runner with externally rotated hips is at an increased risk of groin injury. This is a relatively easy thing to diagnose but very hard to change, particularly among athletes whose movements and coordination are extremely patterned. A much harder to detect example is poor glute activation, someone who suffers from this is at considerable risk of lower back, hip or groin injury because of their inability to activate their glutes which creates an over-reliance on different muscles.