Does platelet-rich plasma have a favorable effect in the early stages of steroid-associated femoral head osteonecrosis in a rabbit model?

OBJECTIVES: This study aims to investigate the effect of platelet-rich plasma (PRP) on femoral head osteonecrosis and compare it with bone marrow injection and core decompression. MATERIALS AND METHODS: A total of 30 healthy, adult, male New Zealand white rabbits (mean weight 2.25±0.15 kg; range 2.0 to 2.5 kg) were used in the study. To create experimental osteonecrosis in all rabbits, 40 mg/kg methylprednisolone acetate was applied intramuscularly. Rabbits were randomly allocated into three groups with 10 rabbits in each: drilling group, PRP group, and bone marrow group. The non-drilled hips of the drilling group were identified as the control group. RESULTS: Rate of necrotic bone was lower in the PRP group compared to other groups. Highest rate of necrotic bone was detected in the control group. New bone formation rate was higher in the PRP group compared to other groups. Lowest new bone formation rate was determined in the control group. Inflammatory reaction rate was higher in the PRP group compared to other groups. CONCLUSION: Platelet-rich plasma injection may play a positive role in the treatment of steroid-associated osteonecrosis in a rabbit model.

Vascular pedicled iliac bone grafting is effective in patients with an early stage of femoral head avascular necrosis.

OBJECTIVES: This study aims to evaluate clinical and radiological findings of a series of patients with avascular necrosis of the femur head (ANFH) treated by core decompression and vascular pedicled iliac crest grafting. PATIENTS AND METHODS: This retrospective study included 26 hips of 22 patients (14 males, 8 females; mean age 36 years; range 16 to 48 years) with ANFH using the vascularized iliac bone grafting between March 2003 and July 2010 in our clinic. The main predisposing factor was steroid use in 13 patients. All patients were assessed clinically according to the Harris hip score and by radiographs by the Association Internationale de Recherche sur la Circulation Osseuse (ARCO) staging system. RESULTS: The mean follow-up was 36 (range 14 to 62) months. Eleven hips (42%) had stage II and 15 hips (58%) had stage III ANFH. The mean Harris scores increased from 52 (range 31 to 63) to 82.8 (range 62 to 90) after surgery. Based on clinical outcomes, 18 hips (69%) were presented as excellent and good, while eight hips presented fair and poor. According to the ARCO staging system, satisfactory results were provided in 17 (65%) of the 26 hips. Two of four hips at preoperatively stage II progressed to stage III, two other hips to stage IV. Five hips at stage III preoperatively progressed to stage IV and these hips had to undergo hip replacement. CONCLUSION: Our results suggest that core decompression and the vascular pedicled iliac bone grafting are effective in early stages of ANFH.