1. From the Hospital for Special Surgery, Cornell University Medical Center, New York, New York. Affiliated with New York Hospital.
2. Department of Radiology and Nuclear Medicine. Address reprint requests to Dr. Pavlov, Assistant Director, Department of Radiology and Nuclear Medicine, The Hospital for Special Surgery, 535 East 70th St., New York, New York 10021.
3. Department of Pathology.
4. Department of Orthopaedic Surgery.