A CONSIDERABLE proportion of surgeons will at one time or another be meeting either for treatment or diagnosis of the disorder which is termed internal derangement of the knee joint. For many years we have obtained the impression that out of teaching and general medical knowledge there was a too persistent and frequent obscurity as to the various pathologic conditions, in their recognition and treatment, that make up this type of disorder. Also, in the approach and planning of the operative treatment that should so successfully resolve the complaint or disability, the status was perhaps analogous to another one of several decades ago when the operative listing in the majority of abdominal operative cases was "exploratory laparotomy" because of handicaps in preoperative recognition of pathologic processes and the appropriate surgical planning for each.
In recent years, particularly in consequence of extensive professional contacts and associations in military service, it has