Technical progress, namely in the field of US probes, allow a more accurate
study of muscles and tendons. The US appearence of muscles and tendons is
closely related to their fibrous structure. Knowledge of the anatomy of fib
rous structures helps understand normal and abnormal images. A wide range o
f lesions, of muscles and tendons, including trauma (luxation and rupture),
infection, tumors as well as degeneration (tendinosis) is presented.