This study investigated the accuracy of using the inferior angle of the scapula (IAS) as a reference for determining spinal levels. Key findings include:
- Common Correlation: The IAS most frequently aligns with the upper body of T9, though variability spans from T7 to T10.
- Variability Factors: Gender, posture, and anatomical differences influence scapular positioning.
- Practical Implications: Chiropractors and other musculoskeletal practitioners may need to revise traditional landmarks when using the IAS for spinal adjustments.
The findings highlight the challenges of using scapular positioning for precise spinal segment identification, emphasizing the need for better methodologies in clinical practice.
Objective
To determine which spinal segment most closely corresponds to the inferior angle of the scapula (IAS) using measurements from A-P full-spine radiographs.
Outcomes
- Average Correlation: The IAS most often corresponds to the upper body of T9 on the left side and the lower body of T9 on the right side.
- Range of Variability: The IAS was found to align with spinal levels from T7 to T10.
- Gender Differences: The IAS was positioned slightly lower in males compared to females.
- Reliability Challenges: Variations in scapular position, posture, and examiner error make it difficult to consistently identify spinal segments using the IAS as a landmark
Conclusion
The IAS is not a consistently reliable landmark for identifying precise spinal levels due to significant variability and common errors in palpation. Practitioners should consider revising traditional rules of thumb for locating spinal levels and may need to explore alternative or supplementary methods for greater accuracy in clinical practice.
