Hyperbaric oxygen therapy as a treatment for stage-I avascular necrosis

Hyperbaric oxygen therapy (HBOT) and physiotheapy as a treatment for stage-I avascular necrosis, has worked miracles. Avascular necrosis (AVN), also called osteonecrosis, aseptic necrosis, or ischemic bone necrosis, is a condition that occurs when there is loss of blood to the bone. Because bone is living tissue that requires blood, an interruption to the blood supply causes bone to die. If not stopped, this process eventually causes the bone to collapse.
Both physical therapy and reducing the pressure load are efficient in pain reduction, but do not affect disease progression. Attempts to reverse the process of bone degradation with non-invasive procedures or procedures less invasive than surgery are still ongoing hyperbaric oxygen therapy (HBOT) is ideal for treating stage I or II of AVN on the Ficat-Arlet scale or Steinberg classification system, since it restores tissue oxygenation, reduces edema and restores venous drainage 

http://uffer.org/downloads/publications/HBO_Femoral_Head_Necrosis.pdf https://www.ncbi.nlm.nih.gov/pubmed/12729112
https://www.sciencedirect.com/science/article/abs/pii/S0014480099922736