Arthroscopic Excision of Juxta-articular Osteoid Osteoma of the Calcaneum  Mohammed Tauheed, M.S. (Ortho), Ravi Jacob Korula, M.S. (Ortho), Sriram Shankarnarayanan, M.S. (Ortho)  Arthroscopy Techniques  Volume 5, Issue 1, Pages e11-e15 (February 2016) DOI: 10.1016/j.eats.2015.10.005 Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 1 Anteroposterior and lateral radiographic views of the left ankle show sclerosis of the superior articular margins of the sustentaculum tali of the calcaneum. Arthroscopy Techniques 2016 5, e11-e15DOI: (10.1016/j.eats.2015.10.005) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 2 Preoperative magnetic resonance imaging scans of ankle and foot. Sagittal PDFS (A) and axial T2 scans (B) show altered signal intensity (edema) around the region of the sinus tarsi and anterior half of the calcaneum, and a coronal PDFS scan (C) shows articular cartilage erosion around the middle and anterior talar articular facets. In addition, there is effusion of the subtalar joint suggesting osteomyelitis of the calcaneum. (PDFS, proton density fat saturated.) Arthroscopy Techniques 2016 5, e11-e15DOI: (10.1016/j.eats.2015.10.005) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 3 Preoperative computed tomography scans of calcaneum. Sagittal (A), coronal (B), and axial (C) scans show a subperiosteal radiolucent lesion with a central nidus and surrounding sclerosis in the sustentaculum tali below the middle articular facet of the calcaneum. Arthroscopy Techniques 2016 5, e11-e15DOI: (10.1016/j.eats.2015.10.005) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 4 Arthroscopic visualization of lesion. (A) The lesion (arrow) had a pinkish hue. (B) Crater (arrow) after debridement with a shaver. (C) Microfracture with a 2-mm K-wire. Arthroscopy Techniques 2016 5, e11-e15DOI: (10.1016/j.eats.2015.10.005) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 5 Anastomosing trabeculae of immature bone prominently rimmed by osteoblasts and osteoclasts. Haematoxylin and eosin staining was used (original magnification, x80). Arthroscopy Techniques 2016 5, e11-e15DOI: (10.1016/j.eats.2015.10.005) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 6 Postoperative computed tomography scans. Sagittal (A), coronal (B), and axial (C) scans show the complete removal of the tumor with a crater in its place. Arthroscopy Techniques 2016 5, e11-e15DOI: (10.1016/j.eats.2015.10.005) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions