The Collaborative International Dictionary of English v.0.48:

Sprain \Sprain\, n.
   The act or result of spraining; lameness caused by spraining;
   as, a bad sprain of the wrist.
   [1913 Webster]

   Sprain fracture (Med.), the separation of a tendon from its
      point of insertion, with the detachment of a shell of bone
      to which the tendon is attached.
      [1913 Webster]