The wrist contains a number of small bones called carpals; together with the finger bones it counts 27 bones in total.
The hamate is a carpal bone on the outside (little finger side) of the wrist. It has a hook shaped part which can under certain circumstances can be fractured.
Injury can occur swinging a golf
club, tennis racket or baseball bat particularly if it suddenly hits an immovable object for example a golf club hitting the floor.
Management usually is conservative and includes immobilisation in a cast (Gelberman, for 4 weeks. If the injury is noticed late then it is likely not to heal in which case the fragment of bone may be removed completely followed by immobilisation in a cast for 3 weeks.
Gelberman R.H., 2009, The Wrist, 3rd Edition, Lippincott Williams & Wilkins, Philadelphia, PA, p: 545