A sacroiliac joint subluxation can also affect the hip on the side of the subluxation.
As previously stated, the hips are very important in creating the torque during the backswing, which is necessary to produce the overall strength of the swing.
As a habit, I always check the iliotibial band on the side of the hip fixation to rule out trigger points, which may inhibit the flexibility needed throughout the swing.
There is always the potential for trigger points (commonly known as muscle knots) to develop, especially with chronic structural instability, which would consequently change the postural biomechanics during the follow through and acceleration of the swing.
The next step of evaluation is of the lower extremities and their effects on the postural biomechanics of the lumbosacral region.
The lower extremities play an important role in the outcome of the golf swing, particularly the mechanics of the foot and ankle joint.
First, it is extremely important to rule out any structural defects in the foot and ankle that may interfere with the normal segmental movements of the spine. For instance, a very common abnormal finding is the presence of pronation
(Figure 6).
This translates into muscular imbalances and spinal joint dysfunction.
If the pronation is ignored, the stability of the spinal segments is compromised.
Since there will always be some biomechanical stress put on the spine and sacroiliac joints during the swing, it is very important to have balance and stability in your foundation, particularly on your backswing.
The transfer of force from the back foot on the backswing, to the front foot on the downswing and acceleration, will determine the distance of the ball.