1. Familial Bilateral Osteochondritis Dissecans of the Femoral Head by Mark C. Lee, Derek M. Kelly, Daniel J. Sucato, and John A. Herring J Bone Joint Surg Am Volume 91(11):2700-2707 November 1, 2009 ©2009 by The Journal of Bone and Joint Surgery, Inc.

2. A through D: Case 1, a male patient who presented with left hip pain at the age of eleven years. Mark C. Lee et al. J Bone Joint Surg Am 2009;91:2700-2707 ©2009 by The Journal of Bone and Joint Surgery, Inc.

3. A through D: Case 2, a male patient who was brought for the evaluation of right hip pain and left leg limp at the age of three years. Mark C. Lee et al. J Bone Joint Surg Am 2009;91:2700-2707 ©2009 by The Journal of Bone and Joint Surgery, Inc.

4. A through F: Case 3, a male patient who presented for the evaluation of bilateral hip pain at the age of nine years. Mark C. Lee et al. J Bone Joint Surg Am 2009;91:2700-2707 ©2009 by The Journal of Bone and Joint Surgery, Inc.

5. A and B: Intraoperative photographs of the right hip of the same patient (Case 3) described in the legend for Figure 3, who had a symptomatic osteochondritis dissecans lesion involving the femoral head. Mark C. Lee et al. J Bone Joint Surg Am 2009;91:2700-2707 ©2009 by The Journal of Bone and Joint Surgery, Inc.

6. Pedigree diagram detailing the affected family members. Mark C. Lee et al. J Bone Joint Surg Am 2009;91:2700-2707 ©2009 by The Journal of Bone and Joint Surgery, Inc.

7. A through C: Case 4, the fifty-nine-year-old father of the first patient described in the present report (Case 1). Mark C. Lee et al. J Bone Joint Surg Am 2009;91:2700-2707 ©2009 by The Journal of Bone and Joint Surgery, Inc.