Osteonecrosis of the femoral head — when the blood supply to the top of the thighbone is cut off and the bone tissue dies — typically strikes adults in their 30s to 50s and, left untreated, often progresses to needing a full hip replacement years before most people expect one.
Because so many different treatments are used (medications, decompression surgery, shockwave therapy, hyperbaric oxygen), doctors and patients alike need a clear picture of what actually works, which is why this large analysis matters: it pooled 29 studies covering 2,177 hips and ranked treatments against each other.
Hyperbaric oxygen — especially when combined with core decompression (a minor surgical procedure that relieves pressure inside the bone) — ranked highest for reducing pain and improving hip function and quality-of-life scores. The honest caveat: no treatment in the analysis, including hyperbaric oxygen, was shown to significantly reduce how often patients eventually needed hip replacement, and the authors note some comparisons were based on limited data, so the rankings should be considered preliminary.
Looking at the individual trials behind this pooled analysis, the hyperbaric protocols used for this bone condition were substantial courses, not quick fixes: studies ran 20 to 40 sessions over several weeks, 3 to 6 days a week, at pressures of roughly 2.2 to 2.5 ATA for 82 to 120 minutes per session. That pattern lines up with a broader theme in hyperbaric research on bone healing — conditions involving slow-healing bone tissue tend to need extended, weeks-long courses rather than the shorter session counts sometimes used for acute soft-tissue issues.
The overall message for patients is that hyperbaric oxygen paired with decompression surgery, delivered as a sustained course, is one of the more promising ways to manage pain from early hip osteonecrosis while other treatment decisions are made.