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.
Radial Anular Tears: (aka: radial fissures) A radial anular tear is any annular tear that begins within the center of the disc (nucleus pulposus) and progresses in an outward or radial. There are five different categories of radial annular tears (grade I - V) which we will discuss further below.