Effect of a Rehabilitation Program After Mesenchymal Stromal Cell Transplantation for Advanced Osteonecrosis of the Femoral Head: A 10-Year Follow-Up Study.
Tomoki Aoyama, Koji Goto, Ryosuke Ikeguchi and 8 others
PMID 35282152WHAT IT FOUND
Ten patients with advanced hip osteonecrosis who received cell transplantation and 12-week rehab maintained improved pain, range of motion, and strength for 10 years.
Five hips did not collapse, but five progressed, with two requiring replacement surgery. No control group means this cannot prove the rehab caused the improvements.
Key findings
01All ten patients participated in the 10-year follow-up, with five hips remaining stable and five progressing to osteoarthritis.
02Clinical scores, range of motion, and muscle strength improved significantly from pretreatment to 10 years in both the stable group and the progressed group that did not need hip replacement.
03The study was a small-scale, single-group pre-post design without a control group, limiting the ability to attribute outcomes to the rehabilitation program.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study had only ten participants, making it a very small case series. There was no control group, so it is impossible to determine if the rehabilitation program, the surgery, or natural history caused the observed outcomes. The study was a secondary analysis, meaning the outcome measures were not originally planned specifically for this long-term functional evaluation. Quality of life data was not statistically analyzed due to the small number of cases in subgroups. The population was restricted to patients aged 20 to 50 with specific radiographic stages, limiting applicability to older patients or those with different disease severities.
Declared interests
The provided text does not contain a specific conflicts of interest or funding declaration section. It notes the original trial was registered in the University Hospital Medical Institution Network Clinical Trial Registry and approved by the hospital ethics committee, but does not state who funded the work or if authors had financial ties to the suppliers listed (Olympus Terumo Biomaterials, Nihon Medix, OG Giken, SAS Institute).
The easy way to misread this
Do not conclude that the 12-week rehabilitation program caused the 10-year functional improvements. This was a single-group study without a control, and all patients received a complex surgical intervention (cell transplantation and bone grafting) alongside the rehab. The improvements may be due to the surgery, natural history, or the combination, and cannot be attributed to the physiotherapy alone.