More than 90% of all sports-related injuries are either contusions or strains. 
A muscle contusion occurs when a muscle is subjected to a sudden, heavy compressive force, such as a direct blow to the muscle. This kind of muscle trauma typically takes place in contact sports, whereas sprinting and jumping are the most common activities associated with muscle strains.  
In strains, an excessive tensile force subjected onto the muscle leads to the overstraining of the myofibres and consequently to a rupture near the musculotendinous junction. Muscle strains typically concern the superficial muscles working across 2 joints, such as the rectus femoris, semitendinosus, and gastrocnemius muscles.   
Ligament injuries are usually sprains and usually due to excessive tensile force leading to varying grades of sprain.