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A line (as of cord) that has at one end a weight (as a plumb bob) and is used especially to determine verticality.

The Scoliosis research society (SRS) has previously described 1) normal sagittal balance as occurring when a plumb line drawn from the centre of the body of C7 lies within ±2 cm of the sacral promontory.

Scoliosis Research Society. White paper on sagittal plane alignment
plumb_line.txt · Last modified: 2017/01/05 13:20 (external edit)