1. Isolated fractures of the carpal bones, except for the scaphoid, are uncommon.
2. Three cases of fracture of the os magnum and one fracture of the trapezium are recorded.
3. Every injury of the hand or wrist should have a most thorough study, including a critical roentgenographic examination.
4. Many cases of so called "sprains", "synovitis", "arthritis", and "rheumatism" are in reality unrecognized fractured carpal bones.
5. Early recognition and adequate treatment are of extreme importance for the ultimate function of the wrist frequently depends upon this early knowledge.
6. Isolated carpal fractures result more frequently from indirect trauma, although direct injury may be the factor.
7. The prognosis in such fractures is usually good, since they heal by bony union.