Medications

Steroid injections do not hasten the need for knee replacement

New research shows that corticosteroid injections for knee OA treatment do not hasten a patient's progression to a total knee replacement when compared with hyaluronic acid injections. Details of this study was presented ...

Surgery

Q&A: Rotator cuff tears—treatment and recovery

DEAR MAYO CLINIC: I'm a 49-year-old man, and I've played tennis for many years without any injuries. But a few weeks ago, I developed pain in my shoulder during a match and was diagnosed with a rotator cuff tear. My doctor ...

Immunology

Asthma patients given risky levels of steroid tablets

More than one quarter of asthma patients have been prescribed potentially dangerous amounts of steroid tablets, with researchers warning this puts them at greater risk of serious side-effects.

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Steroid

A steroid is a terpenoid lipid characterized by its sterane or steroid nucleus: a carbon skeleton with four fused rings, generally arranged in a 6-6-6-5 fashion. Steroids vary by the functional groups attached to these rings and the oxidation state of the rings. Hundreds of distinct steroids are found in plants, animals, and fungi. All steroids are made in cells either from the sterol lanosterol (animals and fungi) or from the sterol cycloartenol (plants). Both sterols are derived from the cyclization of the triterpene squalene.

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