Final answer:
The test that measures posterior shear is called the Posterior Shear Test. It is used in physical therapy to assess the stability and mobility of the lumbar spine.
Step-by-step explanation:
The test that measures posterior shear is called the Posterior Shear Test. This test is used in the field of physical therapy to assess the stability and mobility of the lumbar spine. It involves applying a posterior force to the spine in order to gauge the patient's response and identify any potential issues or abnormalities.