By Dr. Matthew M. Rosman, GSEE
Director of Biomechanics and Sports Science
In Part 3, the discussion will continue with a focus on performance based concepts with respect to the avoidance of over-activation of the
QL. Increased muscular tension of the
QL poses the potential for a
Pivot Blocking effect. One such example of a mechanism permitting increased muscular tension of the
QL was discussed in the previous article with a brief description of
Lower Cross Syndrome.
To review, using the reference,
Management of Common Musculoskeletal Disorders, Fourth Edition, by Darlene Hertling BS, RPT and Randolph M. Kessler, MD, With Contributors (
Lippincott Williams & Wilkins, A Wolters Kluwer Company), on page 150, Lower Cross Syndrome’s
QL effect was described:
“An imbalance can also exist in the lateral lumbopelvic musculature. If weakness occurs in the gluteus medius (Fig 7-21) it can be compensated for by overactivity and tightness in the ipsilateral quadratus lumborum (Figs. 7-16B and 23-8) and tensor fascie latae (Fig 7-2).136”