Define nadir. nadir synonyms, nadir pronunciation, nadir translation, English dictionary definition of nadir. n. 1. Astronomy A point on the celestial sphere directly below the observer, diametrically opposite the zenith. 2. The lowest point: the nadir of their...
Annular tear â definition and causes. By Michael Perry, M.D. An annular tear is one of the most common degenerative spine conditions that develop with the natural aging process of the spine. In fact, many people over the age of 50 have an annular tear and never know it.
Annular Tear in a Spinal Disc. An annular tear describes a hole in the outer intervertebral tissue wall, possibly facilitating the expulsion of nucleus pulposus material from the disc into the greater surrounding spinal anatomy. Annular tears are relatively common in the intervertebral discs and are not inherently painful or pathological in any way.