1. A study of fifty patients with dislocations of the lunate bone or perilunar dislocations has been made. The period of observation was adequate in thirty-eight.

2. The injuries generally occur in young or middle-aged men after unusually severe trauma.

3. Associated injuries are frequent, and the most common of these is damage to the median nerve.

4. In one-third of the cases the nature of the lesion was not initially diagnosed or the initial treatment was inadequate.

5. A dislocated lunate bone may be replaced even at a late stage and even if the displacement is severe so long as there is some soft-tissue attachment. The anterior approach may safely be used for the replacement.

6. The lunate bone may be removed without involving the necessity for arthrodesis of the wrist.

7. Open reduction should be employed for trans-scaphoid dislocations whenever exact realignment and good fixation cannot be achieved by closed methods.

8. Excision of the proximal row of the carpus gives the possibility of salvage of a reasonable degree of function, and may be preferable to arthrodesis or removal of only part of the proximal row.

1. Nine cases of disturbance of the relationship between the scaphoid and the radius and between the scaphoid and the lunate bones are described.

2. Persistent dislocation of the scaphoid bone may follow reduction of perilunar dislocations or of other dislocations of the proximal row of the carpus. It may be obvious, as in waist-deep dislocation, or may be solely a rotational dislocation which may be difficult to diagnose.

3. Uncorrected rotational dislocation of the scaphoid bone caused significant disability in six of seven cases.

4. Aids to the diagnosis of this condition are described and a vigorous approach to the problem of correction is advocated.

5. The experience of other workers in this field is reviewed and discussed.