Cell therapy for posttraumatic shoulder osteonecrosis.

Purpose: This study compared the clinical and radiological results of bone marrow mesenchymal stem cell implantation with traditional simple core decompression (CD) using a matched pair case-control design for osteonecrosis of the humeral head (ONHH) after fracture of the proximal humerus.

Patients: We retrospectively reviewed 64 patients who had surgery for ONHH. Thirty patients had been treated with cell therapy between 2010 and October 2015, with 18 patients at pre-collapse stage (8 stages-I, 10 stages-II), and 12 patients at post-collapse stages (7 stages-III and 5 stages-IV). Using a matched pair case-control design, these 30 study patients were compared to 34 other patients who were treated with simple core decompression (CD) without cells (control group).

Methods: The cell therapy group was treated with percutaneous mesenchymal cell (MSCs) injection obtained from bone marrow (BM) concentration. During a mean follow-up duration of 7years (5 to 10years), radiographs performed each year were used to evaluate the radiological results; the Constant score and visual analogue scale were chosen to assess the clinical results. We assessed stage progression, collapse and arthroplasty conversion rate. Survivor rate analysis was performed using these parameters as the primary endpoints.

Results: Among the 30 shoulders included in the cell therapy group, three (10%) humeral heads had collapsed at the most recent follow-up, versus 25 (74%) in 34 shoulders after simple core decompression (P<0.0001). As consequence, we observed statistically significant difference (P=0.0001) in the humeral head survival (absence of arthroplasty conversion) rate at the end time point between the cell therapy group (93% survival) and simple core decompression (26% survival). Better results were obtained for early stages (stages I and II) osteonecrosis without collapse at baseline.

Conclusion: Core decompression with cell therapy was a safe and effective procedure for treatment in the pre-collapse stages of posttraumatic shoulder osteonecrosis and improved the outcome of the disease as compared with simple core decompression without cells.