Tier 3 — preclinical

Alpha-Ketoglutarate, a Natural Endogenous Metabolite, Enhances Rotator Cuff Tendon-to-Bone Healing by Mitigating Postmenopausal Osteoporosis

Wei X, Wang H, Wang C, Wu L, Xin Z, Wang D, Qu C, Liu W, Zheng X, Yu Y
The American Journal of Sports Medicine 2026 54(1):152-161

Bibliography

PubMed
PMID 41476415
DOI
10.1177/03635465251393710
Funding
Supported by the Natural Science Foundation of Minhang District of Shanghai (No. 2021MHZ081) and the Clinical Research Project of Shanghai Municipal Health Commission (No. 20224Y0326).
Competing interests
The journal reports a combined potential conflict-of-interest/source-of-funding disclosure listing these two public research grants and notes that AOSSM checked author disclosures against the Open Payments Database without conducting an independent investigation.

Study snapshot

DesignControlled laboratory animal study, 4 arms
Model48 female Sprague-Dawley rats: sham control, ovariectomy (OVX) control, OVX + rotator cuff repair (RCR), and OVX + RCR + local αKG-enriched fibrin
Sample48 rats total across 4 groups
InterventionLocally administered αKG-enriched fibrin gel applied at the tendon-bone interface during rotator cuff repair surgery, in rats with surgically induced postmenopausal-type osteoporosis (ovariectomy)
DurationAssessed at 6 and 12 weeks post-surgery
EndpointsBone quality by micro-CT (bone volume fraction, trabecular number and thickness); Histology and immunohistochemistry of bone and tendon-bone interface; Osteoclast and osteoblast activity markers; Biomechanical strength of the tendon-to-bone repair (ultimate failure load and stress)

What the study showed, in plain terms

This 2026 rat study looked at a specific clinical problem: rotator cuff surgery tends to fail more often in people with osteoporosis, because weakened bone cannot hold the surgical anchors securely. The researchers tested whether applying AKG directly at the repair site, in rats with surgically induced postmenopausal-type bone loss, could improve healing.

Rats that received AKG-enriched fibrin at the tendon-bone junction during rotator cuff repair showed better bone quality, more active bone-building cells relative to bone-resorbing cells, and a biomechanically stronger repair than rats that had surgery alone — especially by 12 weeks after surgery.

This is a locally applied, surgical-site intervention in rats, not oral supplementation, and not a human study. It does not tell us anything about whether swallowing a Ca-AKG capsule affects bone healing or osteoporosis risk in people. What it does add to the Ca-AKG evidence base is a second, independent line of animal evidence that AKG has a genuine, mechanistically traceable effect on bone cell biology — complementing the mouse ageing and bone-maintenance literature already in this hub.

Key findings

  • Local AKG improved bone quality after ovariectomy-induced osteoporosis: micro-CT showed higher bone volume/total volume fraction, trabecular number, and trabecular thickness in the AKG-treated group compared with rotator cuff repair alone, with the difference more pronounced at 12 weeks than 6 weeks.
  • The mechanism was a shift in bone cell activity: histology and immunohistochemistry showed decreased osteoclastic (bone-resorbing) activity and increased osteoblastic (bone-building) activity in the AKG group.
  • The repair itself was biomechanically stronger: the AKG-treated tendon-to-bone repairs withstood a higher ultimate failure load and stress on mechanical testing than repairs without AKG.

What this study can and cannot tell us

Local, not oral, delivery. AKG was delivered as an enriched fibrin gel directly at the surgical site, not as a dietary or oral supplement. This paper cannot be used as evidence that an oral Ca-AKG capsule affects bone healing or fracture risk.

Animal model. Findings are in ovariectomised rats, a standard but imperfect model of postmenopausal bone loss, and have not been tested in a surgical human population.

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Dr. Khaled Mahmoud, MBBChCritical Care Medicine, Longevity Science & Editorial Direction Dr. Amr Yasser, PhDCardiometabolic, Musculoskeletal, Gut & Bioavailability Dr. Abdulla Mostafa, PhDCellular Senescence, Neurological, Mitochondrial & Brain-Ageing Biology