The case report we present concerns a 65-year-old male patient with idiopathic osteonecrosis of the left femoral head. After
repeated cycles without the significant success of physiotherapy treatments, due to the worsening of the painful symptoms in
the left coxo-femoral site with increasing functional limitation, it was decided to proceed with decompression surgery of the
femoral head using a cannulated biological screw which due to its intrinsic structural characteristics, allowed the simultaneous
application in the neck and femoral head of PRP growth factors prepared at the time of surgery. The clinical picture surprisingly
regressed in a very short time with a complete functional recovery in the absence of significant pain. The MRI examination
performed before the treatment in place, compared with a similar examination after 5 months, shows sub-total remission of
the signal affecting the trabecular structure of the cephalic portion of the femur in line with the clinical picture just reported.