After an injury, sports or otherwise, the risk of re-injury is much higher due to subsequent muscle inhibition and compensation, reduced range of movement and protective tone as well as balance, proprioception and biomechanical issues.
We all know people with ongoing neck or back pain, hamstring strains and ankle injuries that gone untreated have led to a decreased or diminished ability to exercise, continuing pain, frustration, time off work and overall expense.
The best way to avoid these issues is to deal with the aforementioned deficits by improving strength, movement and balance through a thorough and monitored rehabilitation program.