What combination of tests is utilized to assess SI dysfunction?

• A. Sacral thrust followed by distraction
• B. Distraction and thigh thrust, then compression
• C. Compression, then sacral thrust
• D. Thigh thrust and straight leg raise

Answer: (B)

The combination of distraction and thigh thrust, followed by compression, is an effective method for assessing sacroiliac (SI) joint dysfunction. Distraction and thigh thrust target the integrity and mobility of the SI joint by examining joint stability and pain provocation. Distraction involves placing the patient in a supine position and applying a force that separates the ilium from the sacrum, testing the joint's ability to withstand forces. The thigh thrust test involves applying pressure through the femur while the patient is in a supine position to elicit pain related to SI joint dysfunction.

After these tests, compression is often performed to further assess the joint’s stability. This sequence helps healthcare providers to accurately identify dysfunction in the SI joint by examining joint responses to both separation and compression forces, which simulate the functional loading conditions of the joint. This combination of tests is comprehensive and allows for a thorough assessment of SI joint pathology.

Other combinations do not adequately encompass the necessary functional assessment of the SI joint, which is critical for diagnosing SI dysfunction effectively. The selected combination draws on the dynamic function of the SI joint and addresses multiple angles of examination.