Vertebral Mechanics
Neutral (Group I) Mechanics
Neutral (Group I) Dysfunction
When a group of three or more vertebrae are motion restricted, there will be an alteration in the lateral curvature of the affected segments. These group dysfunctions are also described as neutral group restrictions, displaying neutral (Type I) mechanics with the restricted coupled movement being sidebending to one side and rotation to the opposite side. Upon examination of a patient, the operator will notice a charateristic fullness overlying the transverse processes of the affected vertebrae. The operator may notice a change in fullness during forward-bending and backward-bending, but there will be no position in which the transverse processes on each side become symetrical. Join Dr. Philip E. Greenman, D.O., F.A.A.O., as he discusses the characteristics of a group dysfunction.
The motion restriction in a neutral group dysfunction has minimal forward- or backward-bending restriction, but has restriction of sidebending to the side of convexity and restriction of rotation to the opposite side. Join Dr. Philip E. Greenman, D.O., F.A.A.O., as he discusses characteristic motion restriction of a neutral group dysfunction. Click here to visualize flexion and extension of a group dysfunction that is convex left -- side view -- back view -- top view. Join Dr. Philip E. Greenman, D.O., F.A.A.O., as he summarizes dysfunction that involves three or more vertebrae.This product is intended for instructional use only. It is not designed for clinical or diagnostic purposes. The authors, producers, and publishers of these materials shall not be held liable for any loss and/or injury arising from the use of information and procedures contained in these programs.