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Category: Ankle, Arthroscopy, Basic Sciences/Biologics Introduction/Purpose: to assess the functional and radiological outcomes after AT-AMIC® (arthroscopic talus autologous matrix induced chondrogenesis) in 2 groups: patients with and without bone marrow edema (BME). Methods: Thirty-seven patients of which 24 without edema (GNE) and 13 with edema (GE) were evaluated. All patients were treated with AT-AMIC® repair for osteochondral talar lesion. MRI and CT-scan evaluations, as well as clinical evaluations measured by the VAS score for pain, AOFAS and SF-12 were performed preoperatively (T0) and at 6 (T1), 12 (T2), and 24 (T3) months postoperatively. Results: GNE consisted of 24 patients while GE consisted of 13 patients. In both groups we found a significant difference for clinical and radiological parameters with ANOVA for repeated measures through four time points(p<0.001). In GNE, AOFAS improved significantly at each follow-up(p<0.05); while CT and MRI showed a significant decrease between T1 and T2 and T2 and T3(p<0.05). In GE, AOFAS improved significantly between T0 and T1 and T2 and T3(p<0.05); CT decreased between T1 and T2(p<0.05), while MRI showed a reduction at each follow-up(p<0.05). Lesion size was significantly higher both in MRI and CT in GE in respect to GNE(p<0.05). In the GNE no patients presented edema at T3, while in GE only 23.08% of the patients presented edema at T3. Conclusion: The study revealed that osteochondral lesions of the talus were characterized by bigger size both in MRI and CT in patients with edema. We conclude that AT-AMIC® can be considered a safe and reliable procedure that allows effective healing, regardless of edema and more than half of patients did not present edema six months after surgery.

The role of bone marrow edema on autologous matrix induced chondrogenesis for the treatment of osteochondral lesions of the talus