According to a friend, who is an orthopedic surgeon, a pre-existing knee injury can many times precipitate an achilles injury because the knees and the achilles tendon are part of the same kinetic chain. the knee injury doesn't cause the achilles injury, but it can indirectly increase the vulnerability of the achilles due to how th body compensates, leading to altered biomechanics, muscle imbalances, and reduced flexibility. If you notice, Angelli had a left knee brace on... Whatever the cause, it is sad news for Steve and the cuse!!!