A positive Fortin finger test is when a patient can consistently pinpoint their area of pain within one centimeter of the posterior superior iliac spine (PSIS) during two separate assessments. This indicates potential issues with the sacroiliac joint.
Understanding the Fortin Finger Test
The Fortin finger test is a physical exam technique used to assess pain originating from the sacroiliac (SI) joint. The test is simple to perform but relies on the patient's ability to accurately locate their pain. Here's a breakdown:
Key Elements
- Location: The patient must indicate their pain within 1 cm of the posterior superior iliac spine (PSIS). The PSIS are bony prominences on the lower back, often visible as dimples.
- Consistency: The patient should point to the same area (within 1 cm) on two separate attempts.
- Interpretation: If both conditions are met, the test is considered positive, suggesting potential SI joint involvement in the pain.
How it is Performed:
- The examiner will first identify the PSIS on the patient's lower back.
- The patient is asked to point to the location of their pain with one finger.
- The location is noted, and the patient is asked again to pinpoint their pain on a second occasion.
Why is the Fortin Finger Test Important?
The Fortin finger test helps clinicians assess the potential source of lower back pain. SI joint dysfunction can cause pain in the lower back, buttocks, or even down the leg.
Implications of a Positive Test
- Sacroiliac Joint Dysfunction: A positive test can indicate the SI joint is a likely source of pain, though further evaluation is often required.
- Diagnostic Assistance: While not a standalone diagnostic tool, it aids in the clinical diagnosis of sacroiliac joint disorders and helps to focus further testing and treatment.
- Guiding Treatment: Identifying the source of pain helps therapists and physicians select appropriate treatment plans that target the SI joint.
Summary
| Feature | Description |
|---|---|
| Test | Fortin finger test |
| Positive Result | Patient consistently points to pain within 1 cm of the PSIS on two separate occasions. |
| Indication | Possible involvement of the sacroiliac joint in the patient's pain. |
| Purpose | Assess for SI joint dysfunction and guide further testing and treatment. |
