Injuries occurring during sporting activities normally fall into two categories - overuse or repetitive strain injuries and injury due to acute trauma. It is this latter category where better reparative techniques that include tissue engineering are required.
Good examples are muscle tears that often heal by fibrosis that impairs the subsequent function of the muscle leading to reduced performance. Ways of promoting muscle regeneration after rupture would be a major clinical advance.
Many other injuries involve the joints. Again, improved methods of promoting meniscus, ligament and cartilage repair are needed not only for maintaining performance after injury but also for prolonging the careers of professional sports persons.