Exploring Sacroiliac Syndrome: Insights from a Pilot Study on Neuromuscular Compensatory Stress

Sacroiliac joint dysfunction (SIJD) remains a challenging condition to diagnose and treat due to its complex presentation and the variability in testing reliability. Some studies report up to 60% unreliability in sacroiliac joint (SIJ) testing, which complicates clinical decision-making. A pilot study presented at the 10th Biennial Congress of the World Federation of Chiropractic Research offers fresh insights into how sacroiliac syndrome (SIS) might relate to neuromuscular compensatory stresses in other parts of the body. This research explores the connection between SIJD and pain or spasm in somatic areas beyond the joint itself, using diagnostic methods from the Sacro Occipital Technique (SOT).

Understanding Sacroiliac Syndrome and Its Challenges

Sacroiliac syndrome involves pain and dysfunction in the sacroiliac joint, which connects the lower spine to the pelvis. The joint plays a crucial role in load transfer and stability during movement. Dysfunction here can lead to pain not only locally but also in other regions due to compensatory neuromuscular patterns.

Traditional SIJ testing often lacks consistency, which means clinicians must look beyond the joint to understand the full picture. This study proposes that areas of pain or muscle spasm in regions such as the medial knee, lateral thigh, and even cranial sutures could serve as indicators of SIJD. These indicators reflect the body's attempt to compensate for dysfunction at the sacroiliac joint.

Methodology of the Pilot Study

The study involved 12 randomly selected subjects from a chiropractic student population, with ethical approval from Logan College of Chiropractic. Researchers used an algometer, a device that measures pain threshold by applying pressure, to assess pain responses at specific somatic sites. These sites included:

• Medial knee

• Lateral thigh

• Upper and lower inguinal ligament areas

• Posterior first costovertebral junctions

• Temporalis muscle

• Occipitomastoid and occipitoparietal sutures

  
  

These areas are part of the diagnostic framework in the Sacro Occipital Technique, which emphasizes the relationship between the sacroiliac joint and other body regions.

After baseline pain thresholds were recorded, subjects received treatment involving orthopedic pelvic wedges (blocks) placed according to SOT protocols. A control group rested supine on a chiropractic Zenith table without intervention for comparison.

Key Findings on Pain Threshold and Treatment Effects

The algometer readings revealed significant changes in pain thresholds when subjects were treated with orthopedic blocks. The control group showed minimal variation in pain thresholds, ranging from a decrease of 3 lbs/cm² to an increase of 2 lbs/cm² across all tested areas.

In contrast, subjects receiving the orthopedic block treatment experienced a significant increase in pain thresholds, indicating reduced pain sensitivity. The most notable improvement occurred at the left upper inguinal ligament area, suggesting this site may be particularly sensitive to changes in sacroiliac joint mechanics.

These findings support the idea that SIJD affects neuromuscular function beyond the joint itself and that targeted orthopedic interventions can alleviate compensatory stress in related somatic regions.

Practical Implications for Clinicians

This pilot study highlights several important points for practitioners managing sacroiliac syndrome:

• Broaden diagnostic focus: Instead of relying solely on direct SIJ tests, clinicians should assess pain and muscle tension in related somatic areas such as the knee, thigh, and pelvic ligaments. These indicators can provide valuable clues about underlying SIJD.

  
  

• Use objective pain measurement tools: Algometry offers a quantifiable way to track pain thresholds and treatment response, improving clinical accuracy.

  
  

• Incorporate orthopedic block treatments: Applying pelvic wedges as part of SOT protocols may help reduce neuromuscular compensatory stress and improve patient outcomes.

  
  

• Consider bilateral assessment: Comparing pain and spasm on both sides of the body can reveal asymmetries linked to sacroiliac dysfunction.

  
  

Limitations and Future Directions

While the study offers promising insights, it is important to recognize its limitations. The small sample size of 12 subjects limits the generalizability of the findings. Larger studies are needed to confirm these results and explore the long-term effects of orthopedic block treatments.

Future research could also investigate how these somatic indicators correlate with other diagnostic tools such as imaging or electromyography. Understanding the neurophysiological mechanisms behind compensatory postural stresses could lead to more targeted therapies.

Summary

Sacroiliac syndrome involves complex neuromuscular compensations that extend beyond the joint itself. This pilot study demonstrates that pain and spasm in specific somatic areas can serve as reliable indicators of SIJD. Using orthopedic pelvic wedges based on Sacro Occipital Technique protocols significantly increased pain thresholds, suggesting reduced pain and improved function.

For clinicians, these findings encourage a broader diagnostic approach and the use of objective pain measurement tools. Incorporating treatments that address compensatory stresses may enhance patient care and outcomes in sacroiliac syndrome.

DeCamp ON, Provencher S, Unger-Boyd M. A Pilot Study: Investigating a Sacroiliac Syndrome.  WFC’S 10th Biennial Congress. International Conference of Chiropractic Research.  Montreal, Canada. Apr 30 – May 2, 2009: 242-3.

Introduction: Some authors have showed 60% unreliability toward SIJ testing [1]. The purpose of this investigation is to propose a relationship between the present regional sacroiliac syndrome (SIS) [2] and additional somatic areas of neuromuscular compensatory postural stresses relating to sacroiliac joint dysfunction (SIJD) [3]. Comparative bilateral areas of pain/spasm as utilized in Sacro Occipital Technique (SOT) [4], termed indicators, were analyzed for clinical and neurophysiological correlation.

Method: 12 subjects were chosen at random, from the student population of Logan College of Chiropractic (IRB approved through Logan College of Chiropractic). Subjects selected were tested with an Algometer for pain response, and recorded, at specific somatic areas utilized diagnostically in SOT related diagnostic procedures (medial knee, lateral thigh, upper and lower aspects of the inguinal ligament, posterior 1st costovertebral junctions, temporalis muscle, occipitomastoid, and occipitoparietal sutures). Subjects were then analyzed for placement of orthopedic pelvic wedges (blocks) and treated according to SOT related protocols. The control group was lying supine for 5 minutes on a chiropractic Zenith table without any intervention.

Results: The Algometer measured the pain threshold differences experienced by the subject’s proposed SIJ related somatic indicators. The mean pain threshold value for the control, which the subject was not orthopedically blocked, was an increase or decrease in pain by -3 to 2 lbs/cm2 for all somatic indicators. Pain thresholds were found to be significantly increased (p < 0.05) when the subjects were treated with orthopedic blocks most noted to the left upper inguinal ligament (9.4 lbs/cm2; p < 0.05), left lower inguinal ligament (6 lbs/cm2; p < 0.05) and left occipitomastoid suture (3.6 lbs/cm2; p < 0.05). The major difference was seen in the left upper inguinal ligament with an increase of 9.4 lbs/cm2 in pain threshold.

Discussion: Based on the taxonomy for SIS provided by The International Association for the Study of Pain, McGrath indicates that diagnostic examination of the SIJ by palpation “is confounded by anatomical and sensory variables. Illustrative of systematic and possibly insurmountable anatomical and sensory confounding [5]” therefore, “the continued use of non-standardized, manual diagnostic palpation as a basis for manipulative intervention is questionable. There is a need to develop a sophisticated, technologically based alternative that offers a reliable multimodal input, standardization of findings and comparative indexing of such findings to a reference data-base [5].”

This study, involving analysis and treatment of SIJ torsion lesions, proposes a new definition of a sacroiliac syndrome based upon a novel interpretation of the neurophysiology and the current pilot clinical trial. Three of the 16 indicator’s pain thresholds increased significantly after orthopedic pelvic blocking as compared to the control group indicating a plausible relationship between the 3 indicators and sacroiliac dysfunction.

Conclusion: There is a clear need for diagnostic protocols that offer a reliable and valid method of evaluating sacroiliac joint dysfunction. It is possible that SOT related protocols may offer a viable alternative to what is used currently in orthopedic circles. The current pilot study while giving interesting information indicates that further studies are needed with a larger sample of subjects, with the full SOT protocols and delineating the possible SI osseous weightbearing versus nutation/counternutation (respiratory) dysfunctions.

References:

1. Laslett M, April CN, McDonald B, Young SB. Diagnosis of sacroiliac joint pain: validity of individual tests and composites of tests. Man Ther 2005, 10:207-18.

2. Cooperstein R. Sacro Occipital Technique. Chiropractic Technique. Aug 1996; 8(3): 125-31.

3. Sterenfeld EB, Chou LH, Herzog R, Vresilovic E. The predictive value of provocative sacroiliac joint stress maneuvers in the diagnosis of sacroiliac joint syndrome. Arch Phys Med Rehabil. 1998 Mar; 79(3):288-92.

4. Zelle BA, Gruen GS, Brown S, George S. Sacroiliac joint dysfunction: evaluation and management. Clin J Pain. 2005 Sep-Oct; 21(5):446-55.

5. McGrath MC. Clinical considerations of the anatomy of the sacroiliac joint (SIJ). A review of the characteristics of function, motion and pain. J Osteopath Med 2004; 7: 16-24.