1. Large Femoral-Neck Cysts in Association with Femoroacetabular Impingement by Klaus-Peter Günther, Albrecht Hartmann, Peter Aikele, Daniela Aust, and Jörg Ziegler J Bone Joint Surg Am Volume 89(4):863-870 April 1, 2007 ©2007 by The Journal of Bone and Joint Surgery, Inc.

2. Figs. 1-A, 1-B, and 1-C A thirteen-year-old boy with unilateral stable slipped capital femoral epiphysis of the right hip had been treated with in-situ screw fixation at another institution in 1983. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

3. Anteroposterior (left) and frog-leg lateral (right) radiographs of the right hip, made in 1993, ten years after the in-situ fixation. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

4. Anteroposterior (left) and frog-leg lateral (right) radiographs of the right hip, made eleven years later, in 2004. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

5. Figs. 2-A through 2-G A twenty-year-old man presented to our institution in 1996 with a one-year history of increasing pain in the right groin. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

6. Anteroposterior (left) and frog-leg lateral (right) radiographs of the right hip, made eight years later, in 2004. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

7. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

8. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

9. Photomicrograph of the cyst wall, showing membranous fibrous tissue with focal chondroid metaplasia (hematoxylin and eosin staining, ×10). Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

10. Intraoperative photograph, taken after arthroscopically assisted mini-open anterior decompression of the hip with débridement and bone-grafting of the cystic cavity. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

11. Anteroposterior (left) and frog-leg lateral (right) radiographs of the right hip, made one year after cyst removal, grafting, and prophylactic stabilization with a dynamic hip screw. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

12. Figs. 3-A, 3-B, and 3-C A forty-six-year-old woman presented to our institution in 2004 with a six- month history of right hip pain after prolonged sitting and activities requiring hip flexion. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

13. Preoperative radial, proton-density-weighted, turbo-spin-echo, fat-suppressed magnetic resonance image of the right hip, made one year later, in 2005. Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.

14. Anteroposterior (left) and frog-leg lateral (right) radiographs, made of the right hip in 2006, ten months after arthroscopically assisted mini-open anterior decompression, cyst resection, bone- grafting, and prophylactic stabilization with a dynamic hip scr... Klaus-Peter Günther et al. J Bone Joint Surg Am 2007;89:863-870 ©2007 by The Journal of Bone and Joint Surgery, Inc.