Muscle pulls and tendon tears are a common occurrence in all sports. As you play, the muscles are rapidly contracting against resistance. The harder you play, the greater the force causing the muscle fibers to tear. In some cases, a complete rupture of the muscle-tendon apparatus is possible.
The majority of the leg muscles insert into the foot. Any muscle can tear or rupture: however, the most common muscle is the plantaris muscle which originates above the knee and inserts into the heel joining the Achilles (heel cord) tendon.