Analysis of Results After Surgical Application of Bone Marrow Aspirate Stem Cell Concentrate in the Treatment of Avascular Necrosis of the Femoral Head.

Introduction: Avascular necrosis or osteonecrosis of the femoral head is defined as a pathological process that results in a critical reduction in the blood supply to the hip head with increased intraosseous pressure. Avascular necrosis is a multifactorial disease. The treatment used so far consists of transosseous decompression of the femoral head and is the most commonly used method in the early stages of osteonecrosis. Aim: The aim of this study was to evaluate the results after application of bone marrow stem cells obtained from the pelvic ridge, which was applied to the necrotic zone after previous decompression. Material and methods. The study is of prospective character and included 30 patients with first, second, and third degrees of AVN according to the Ficat classification, determined with X-ray. The range of motion in the hip was examined preoperatively by using a goniometer, a radiological evaluation of the degree of AVN was performed, according to the Ficat classification, and the VAS scale and the Harris Hip Score were examined preoperatively and postoperatively. Results: The average value for the Harris Hip Score (HHS) preoperatively was: for Ficat I -66.32±5.1, for Ficat II - 49.19±3.4 and for Ficat III - 33.71±2.1. At the 3-month postoperative follow-up, the average HHS values were: 87.92±4.3 for Ficat I, 78.64±6.6 for Ficat II and 76.48±2.6 for Ficat III. The same values for HHS were obtained in the control examinations at the 6th and 12th month postoperatively, indicating the fact that good bone regeneration was achieved and the progression of the condition was prevented. A decrease in the HHS value was observed at the control examination at 1 year after the surgical treatment, in 3 patients according to the Ficat classification of grade III, in whom a total hip replacement surgery was performed. Conclusion: The use of stem cells in the treatment of avascular necrosis of the femoral head has achieved good functional results and reduced pain in operated patients. Radiographically, good bone regeneration was achieved and the progression of necrosis to a higher degree was prevented.