hollow back

plural hollow backs

1. countableuncountableLumbar lordosis.

   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).

   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), Dordrecht: Springer, →DOI, →ISBN, page 167

   2 more examples

   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.

   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, volume 11, →DOI, pages 325–326

   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.

   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, Heidelberg: Springer, →DOI, →ISBN, page 67

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