Poster 296: Comparing Outcomes of Osteochondral Allograft Transplantation of the Knee Preserved by the Missouri Osteochondral Preservation System to Standard Preservation Methods

Objectives: Osteochondral allograft (OCA) transplantation is an established surgical intervention for full-thickness chondral defects. Standard Preservation (SP) protocols currently allow for osteochondral allografts to be stored for a maximum of 28 days after procurement. The Missouri Osteochondral Allograft Preservation System allows for grafts to be stored for at least 60 days after procurement. The purpose of this study is to compare clinical and radiographic outcomes in patients that have undergone OCA transplantation utilizing Missouri Osteochondral Allograft Preservation System (MOPS) to standard preservation protocols. Methods: Retrospective review identified all patients who underwent OCA transplantation between 2012 and 2018. Patients without appropriate follow-up, postoperative outcomes, or necessary imaging were excluded. All patients had at least 2-year follow-up data. Patient demographics, outcomes, and graft information were compared between patients who received grafts preserved by MOPS and standard preservation as previously defined. Results: Sixty-four patients were included. Twenty-five were in the MOPS group and 39 in the SP group. Members of the MOPS group were younger at the time of surgery than those in the SP group (28.6 ± 10.7 years in MOPS vs. 36.7 ± 10.9 in SP group, P = 0.005). Seventy-six grafts were analyzed with 39 grafts in the MOPS group and 37 in the SP group. Grafts in the MOPS group were stored longer (average 50.03 days) than grafts in the SP group (average 23.18 days) (P < 0.001). No difference between groups was found in complications or reoperation rates. Outcomes between the 2 groups showed no statistical differences for complications or revisions as well as similar Knee Injury and Osteoarthritis Outcome Scores for Joint Replacement, International Knee Documentation Committee scores, 12-item psychosocial safety climate scores, and 12-item mental health component summary scores. Conclusions: Grafts preserved using the MOPS were stored for more than double the length of time than grafts preserved with standard preservation techniques. There was no difference in postoperative outcomes following OCA transplantation regardless of preservation method used.