hollow back

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hollow back (countable and uncountable, plural hollow backs)

1. Lumbar lordosis.

   Alternative forms: hollow-back, hollowback

   • 1983, J. David Cummins, Barry D. Smith, R. Neil Vance, Jack L. VanDerhei, Risk Classification in Life Insurance (Huebner International Series on Risk, Insurance, and Economic Security; 1)‎^[1], Dordrecht: Springer, →DOI, →ISBN, page 167:

     The three disorders analyzed in the category of spinal curvature include kyphosis or hunchback (posterior convexity); lordosis, or hollowback (anterior convexity); and scoliosis (lateral curvature).

   • 1989, J. M. Vital, J. L. Beguiristain, C. Algara C. Villas, B. Lavignolle, N. Grenier, J. Sénégas, “The neurocentral vertebral cartilage: Anatomy, physiology and physiopathology”, in Surgical and Radiologic Anatomy‎^[2], volume 11, →DOI, pages 325–326:

     Scanographic study
     Cases
     Twenty-five vertebral columns of 6 to 20 years were examined (10 male patients and 15 female). There were 10 normal cases with routine section passing through T8. The 15 abnormal cases included 10 scolioses (4 congenital), 3 hollow backs and 2 kyphoses subsequent to Scheuermann's disease.

   • 2012, Hans-Ulrich Schulz, René Mantke, Hans Lippert M.D., edited by René Mantke, Hans Lippert, Markus W. Büchler, and Michael G. Sarr, International Practices in Pancreatic Surgery‎^[3], Heidelberg: Springer, →DOI, →ISBN, page 67:

     In general, the patient is placed supine on a flexible operation table. The table is adjusted to bring the patient into hollowback hyperextended position and rotated slightly to the right. A curved, right subcostal incision allows for convenient exposure of the pancreas and all other relevant structures.

2. Used other than figuratively or idiomatically: see hollow,‎ back.