Decreased Osteogenic Activity of Mesenchymal Stem Cells in Patients With Corticosteroid-Induced Osteonecrosis of the Femoral Head

BackgroundOsteonecrosis (ON) of the femoral head occurs when cells of trabecular bone spontaneously die. Mesenchymal stem cells (MSCs) have been introduced into the femoral head in an attempt to halt progression of the disease. The purpose of this study was to functionally compare MSCs in patients with ON of the femoral head with patients without.MethodsMesenchymal stem cells were isolated from 20 patients with corticosteroid-induced ON and 10 controls without. Colony-forming unit and proliferation assays were used to assess MSC proliferation. Mesenchymal stem cells were differentiated into bone, fat, and cartilage. Functional assays were used to quantify the differentiation capacity.ResultsControl MSCs demonstrated greater cellular growth potential and improved ability to differentiate into bone.ConclusionThe decreased ability to differentiate into bone may be a reason why patients treated with autologous MSC infusion fail regenerative treatment strategies and progress to collapse.