What physical action does the examiner perform during the McKenzie Side Glide test?

During the McKenzie Side Glide test, the examiner performs a specific physical action where they block the patient's shoulder and pull the pelvis. This technique is designed to assess the movement and response of the spine and associated structures when put under lateral stress. The purpose of the test is to identify any potential asymmetries or dysfunctions in the spine's movement patterns, particularly in the lumbar region. By stabilizing the shoulder and applying traction to the pelvis, the examiner aims to elicit a response that can indicate whether there is a directional preference for movement or if particular symptoms are reproduced, thereby providing valuable information for diagnosis and treatment planning. This method is distinct from other techniques that may involve pushing or applying pressure in different ways or directions, underscoring the importance of understanding the mechanics involved in the McKenzie approach.