Postural instability after lumbar spinal surgery: are there any predictive factors? A case control study.

Background: The surgical spinal degenerative pathology mainly concerns the herniated intervertebral disks. Surgery is indicated when the pain becomes chronic and intense, and when motor signs appear. The results are positive in about 90% of cases, leading to the solution of the problem. However, an estimated percentage of 4% to 20% reported residual pain and postural instability after the surgical treatment of discectomy.

Method: We have examined a sample of patients, retrospectively registered, undergoing surgical treatment for degenerative lumbar disease. Some of them developed postural instability. They were subjected to cycles of postural gymnastics. Postural gymnastics has proved to be a tool capable of solving unstable post-surgical posture. It included an exercise of breathing, one or two of muscular distension, one of muscular reinforcement, and one of postural correction. We used an evaluation form we created in agreement with the physiatrist for postural exercises that was based on some basic parameters such as muscle and respiratory function. At each cycle, a score was attributed to the performance of muscular and respiratory exercise to evaluate the function and therefore the degree of instability (1-3 = mild, 4-7 = medium, 8-10 = severe).

Results: Results were satisfactory, with return to normal posture. The improvement of postural instability has been demonstrated both by the score of the evaluation forms that have highlighted the transition from a state of severe intensity to one of normality and by a clinical aspect, concerning the static and dynamic posture.

Conclusions: The postural instability has a multifactorial genesis, and different mechanisms are involved: the vertebral bone structures and the pelvis, the paraspinal muscular structures, and the nerve structures. These structures are altered after surgery due to predisposing factors, and for the action of conditions acquired as obesity.