The rule that cut ankle X-rays
The Ottawa ankle rules were built from 750 adults with ankle injuries at two Canadian emergency departments. In the original study, the rules picked up all 70 significant malleolar fractures, so many patients could safely skip the X-ray.
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Stiell IG et al. Ann Emerg Med 1992;21:384–90The army surgeon who invented the cast
Plaster casts are younger than the stethoscope. Antonius Mathijsen, a Belgian army surgeon, introduced plaster-of-Paris bandages for fractures in 1852, changing how broken bones were held still.
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The Classic: New method for application of plaster-of-Paris bandage. Clin Orthop Relat Res 2007The famous splint statistic is disputed
The Thomas splint is often credited with dramatically reducing deaths from femoral fractures during the First World War. A historical review found that publications disagree about the actual reduction—a reminder that famous medical statistics can have uncertain foundations.
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Henry BJ, Vrahas MS. The Thomas splint. Questionable boast of an indispensable toolLoading turns down a bone brake
In experimental bone loading, osteocytes reduced production of sclerostin, a protein that inhibits bone formation. Regions exposed to greater strain showed a larger reduction, suggesting bone can tune its response locally rather than acting as one uniform structure.
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Robling AG et al. J Biol Chem. 2008;283:5866–5875Acute compartment syndrome threatens perfusion
In acute compartment syndrome, injury-related bleeding or swelling increases pressure within a muscle compartment. Because the surrounding fascia has limited stretch, pressure can compromise blood flow and cause permanent tissue injury without urgent treatment.
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healthdirect compartment syndromeOsteocytes can remodel their own rooms
Osteocytes are not merely cells trapped inside bone. During reproductive cycles, they can remove and later replace mineral around their own lacunae—a form of local remodelling distinct from the familiar surface work of osteoclasts and osteoblasts.
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Wysolmerski JJ. Osteocytes remove and replace perilacunar mineral. Bone. 2013A calcium-binding molecular helix
Osteocalcin contains specialised Gla residues that help it bind bone mineral. Their arrangement in a calcium-dependent helix supports attachment to hydroxyapatite: the protein's shape helps connect bone's organic matrix with its mineral component.
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Hauschka PV. Haemostasis. 1986A force sensor inside bone cells
In an osteocyte cell-line study, mechanical stretch lowered expression of the sclerostin gene through a Piezo1–Akt pathway. Blocking or removing Piezo1 prevented the response: a molecular force sensor helped translate stretch into a bone-regulating signal.
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Sasaki F et al. Biochem Biophys Res Commun. 2020;521:806–813Antlers are a regeneration laboratory
Deer regrow antlers annually, offering a model of organ regeneration in mammals. Researchers mapped the cells involved and identified a progenitor population arising during regrowth—not simply ordinary adult bone expanding.
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Qin T et al. Science 2023;379:840–847Low bone density may echo in the ear
A study comparing people with normal bone density, osteopenia and osteoporosis found altered middle-ear mechanics in the low-density groups. However, conductive hearing loss was not more frequent—abnormal mechanical measurements did not translate neatly into that hearing-loss category.
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Changes in middle ear transmission secondary to altered bone remodellingBone makes a vitamin K protein
Vitamin K biology extends beyond clotting. Osteoblasts produce the vitamin K-dependent protein osteocalcin, and a small fraction enters the bloodstream instead of remaining in bone. That makes circulating osteocalcin a window into bone metabolism.
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Lian JB, Gundberg CM. Clin Orthop Relat Res. 1988The splint that changed jobs
The Thomas splint began as a way to correct lower-limb deformity, not as battlefield fracture equipment. Its role evolved through both World Wars, while its basic design changed little from Hugh Owen Thomas's published description in 1875.
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Robinson PM, O'Meara MJ. The Thomas splint: its origins and use in traumaHip replacement needed a friction fix
John Charnley's contribution to hip replacement was not simply a new metal joint. His low-friction approach combined polyethylene with acrylic cement fixation, tackling wear and implant stability as well as the painful joint itself.
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Phalak et al. Cureus 2024;16:e68832Milk borrows calcium from the skeleton
During breastfeeding, maternal bone supplies much of the calcium needed for milk. This mobilisation is not simply switched off by greater dietary calcium intake. After weaning, the skeleton normally rebuilds its previous mineralisation and strength.
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The puzzle of lactational bone physiology. J Clin Invest. 2019Space station life thins the hip
A study of International Space Station crew found that cortical mineral loss at the hip occurred mainly through thinning from the inner bone surface. Spaceflight bone loss was therefore not just a uniform reduction in density.
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Lang T et al. J Bone Miner Res. 2004;19:1006–1012You're all caught up
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