S86.111 - Strain of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, right leg S86.1 - Injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level S86.11 - Strain of other muscle(s) and tendon(s) of posterior muscle group at lower leg level S86.111 - Strain of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, right leg