Which of the following is true about acute rupture of tendc calcaneus (tendo-achillis)?

This is injury of middle aged persons usually occuring due to unaccustomed exercise. Direct injury is not the cause of tendon | rupture although most patients feel as if something has hit. X-Rays are of no value in diagnosis. Planterflexion of ankle on compression of calf occurs when the tendon is intact and its absence signifies tendon rupture. Surgical repair is preferable treatment.