1. Atraumatic Osteonecrosis of the Talus* by RONALD E. DELANOIS, MICHAEL A. MONT, TAEK RIM YOON, MARK MIZELL, and DAVID S. HUNGERFORD J Bone Joint Surg Am Volume 80(4):529-36 April 1, 1998 ©1998 by The Journal of Bone and Joint Surgery, Inc.

2. Fig. 1 Illustrations showing anteroposterior and lateral views of the talus with the four zones used to define the area involved with osteonecrosis. RONALD E. DELANOIS et al. J Bone Joint Surg Am 1998;80:529-36 ©1998 by The Journal of Bone and Joint Surgery, Inc.

3. Fig. 2 Anteroposterior radiograph of a forty-nine-year-old woman who had had pain for two months but no loss of motion. RONALD E. DELANOIS et al. J Bone Joint Surg Am 1998;80:529-36 ©1998 by The Journal of Bone and Joint Surgery, Inc.

4. Fig. 3 Anteroposterior radiograph of a forty-one-year-old woman who had had a four-month history of pain in the talus and loss of motion. RONALD E. DELANOIS et al. J Bone Joint Surg Am 1998;80:529-36 ©1998 by The Journal of Bone and Joint Surgery, Inc.

5. Figs. 4-A and 4-B: Magnetic resonance images of a forty-four-year-old woman with systemic lupus erythematosus who was seen because of pain in the ankle. RONALD E. DELANOIS et al. J Bone Joint Surg Am 1998;80:529-36 ©1998 by The Journal of Bone and Joint Surgery, Inc.

6. Fig. 4-B The coronal image reveals a large area of osteonecrosis (arrowheads). RONALD E. DELANOIS et al. J Bone Joint Surg Am 1998;80:529-36 ©1998 by The Journal of Bone and Joint Surgery, Inc.

7. Fig. 5 Magnetic resonance image of a forty-three-year-old woman who had multiple sclerosis. RONALD E. DELANOIS et al. J Bone Joint Surg Am 1998;80:529-36 ©1998 by The Journal of Bone and Joint Surgery, Inc.