-the vertebra is divided anatomically into the vertebral body anteriorly and the neural arch posteriorly. The neural arch is composed of bilateral pedicles, pars interarticularis, and laminae; from the neural arch arise the spinous process, bilateral transverse processes, and bilateral superior and inferior articulating processes. These anatomic components are known collectively as the posterior elements of the vertebra.

-Myeloma bone disease can result not only in fractures, but in pressure on the spinal cord (spinal cord compression), the need for surgery to prevent or repair broken bones, and/or the need for radiation treatments to the bone to control the myeloma and relieve pain. These are collectively known as “skeletal-related events.”

Reference:- 1-https://journals.lww.com/cdronline/Abstract/2017/11150/Lytic_Lesions_of_the_Posterior_Elements_of_the.1.aspx 2-https://www.myeloma.org/bone-disease