The Most Common Lower Back Injury Inducing Mechanics is Reverse Spine Angle

A Reverse Spine Angle is any excessive thorax backward bend or excessive thorax left lateral bend (for right handed golfers) During the swing. The Upper body tends to dominate the swing when the lower body can't initiate the downswing or has a limited ability to initiate the movement. This swing characteristic puts stress on the lower back due to rapid forward flexion, lateral flexion, and rotation all occurring simultaneously through impact. 

We typically find the player can not rotate in the thorax in the backswing and also their trail hip also can't internally rotate with this type of mechanics

"S" Posture

S-Posture is Characterized by too much thoracic kyphosis combined with excessive lumbar lordosis. This Can be due to the player sticking their tail bone out too much in their setup position or from postural dysfunction (Lower Crossed Syndrome) that is evident even in their standing posture. This recessive lordosis already sets the player into a lumbar extension. This faulty posture and potential deactivation of the core muscle can cause a loss of posture or reverse spine angle during the backswing. This, in turn, puts the lower body off of potion on the downswing and will affect the swings' sequence of motion

We typically find that the player can not extend the hips and thorax spine.

Early Extension

Early Extension occurs when the hips move closer to the ball in the swing. Early Extension can stress the lower back in two ways. First, If done with spine extension it can put excessive stress on the facets, due to rapid extension in the spine. Second, if done with spine flexion, it can stress the intervertebral discs and lead to herniations. 

We typically find the player has a difficult time rotating in the lead and trail hip and the thorax spine.