Outcomes
blood loss
RECURRENCE, PATHOLOGIC FRACTURE, BLOOD LOSS, BONE LESIONS, SECONDARY, DEEP SURGICAL SITE INFECTION, COMPLICATIONS
The primary outcome was the volume of the recurrence as measured on 2-year follow-up MRI. If the patient underwent a reoperation for recurrence before the 2-year follow-up, the size of the recurrence on the MRI prior to the reoperation was used as this end point. A musculoskeletal radiologist and a pediatric orthopaedic surgeon not involved in the treatment of these patients analyzed all images. Blinding of these evaluators was not possible, as the properties of allograft and bioactive glass on the images are different. The secondary outcomes were the recurrence rate, risk of reoperation (surgery or interventional radiology), MSTS score at the 2-year follow-up, and complications (blood loss of >50% of calculated blood volume, deep surgical site infection, pathologic fracture, and growth disturbance).All patients had preoperative radiographs (anteroposterior and lateral) and MRI of the lesion, which included T1 and T2-weighted, STIR (short tau inversion recovery) or FS (fat saturation), and gadolinium-enhanced sequences. The recurrence of bone lesions was classified using the Neer classification