1. Treatment of Unicameral Bone Cyst by Hsien-Yang Hou, Karl Wu, Chen-Ti Wang, Shun-Min Chang, Wei-Hsin Lin, and Rong-Sen Yang JBJS Essent Surg Tech Volume os-93(Supplement 1):92-99 March 16, 2011 ©2011 by The Journal of Bone and Joint Surgery, Inc.

2. A: The midpoint of the cyst is localized by preoperative images and/or fluoroscopy. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

3. A small fenestration is created in the cortex with a small trephine or a drill-bit inserted through the thinnest part of the cyst wall at the level of the midpoint of the cyst. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

4. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

5. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

6. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

7. Ninety-five percent ethanol solution is injected to fill the cyst to eradicate any remaining active cyst membrane lining cells. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

8. The curved impactor is first used to measure the cyst size and to break the cyst wall. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

9. This allows fresh bone-marrow cells from the healthy medullary canal to enter the cyst cavity. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

10. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

11. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

12. One half-thread cannulated screw is inserted through the small fenestration to provide continuous decompression. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.

13. A: A twelve-year-old boy with an active unicameral bone cyst in the proximal part of the left humerus. Hsien-Yang Hou et al. J Bone Joint Surg Am 2011;os-93:92- 99 ©2011 by The Journal of Bone and Joint Surgery, Inc.