1. Arthroscopy-Associated Complications in Osteosarcoma by John A. Sielatycki, Edward J. Fox, and Elizabeth E. Frauenhoffer JBJS Case Connect Volume 2(4):e68 November 14, 2012 ©2012 by The Journal of Bone and Joint Surgery, Inc.

2. Initial arthroscopic image showing an inflammatory mass involving the joint space in the intercondylar notch before the debridement. John A. Sielatycki et al. JBJS Case Connect 2012;2:e68 ©2012 by The Journal of Bone and Joint Surgery, Inc.

3. Initial arthroscopic image after the debridement. John A. Sielatycki et al. JBJS Case Connect 2012;2:e68 ©2012 by The Journal of Bone and Joint Surgery, Inc.

4. T1-weighted sagittal MRI without contrast. John A. Sielatycki et al. JBJS Case Connect 2012;2:e68 ©2012 by The Journal of Bone and Joint Surgery, Inc.

5. T1-weighted sagittal MRI with contrast. John A. Sielatycki et al. JBJS Case Connect 2012;2:e68 ©2012 by The Journal of Bone and Joint Surgery, Inc.

6. Photomicrograph revealing the tumor cell involvement of the synovium, a rare finding in osteosarcoma (hematoxylin and eosin stain, 5× magnification). John A. Sielatycki et al. JBJS Case Connect 2012;2:e68 ©2012 by The Journal of Bone and Joint Surgery, Inc.

7. A surgical specimen showing necrotic tumor in the distal part of the femur, with extension into the joint in the intercondylar notch. John A. Sielatycki et al. JBJS Case Connect 2012;2:e68 ©2012 by The Journal of Bone and Joint Surgery, Inc.