Gaenslen's Test: Pain Provocation at the Sacroiliac Joint

When a client points to pain right in the "gap" of the sacroiliac joint (that area between the posterior superior iliac spine and the sacrum), Gaenslen's test is one of the most widely used provocation tests to confirm whether that joint is involved in the problem.

Unlike Gillet's test (which assesses mobility), Gaenslen's test aims to reproduce pain through a position of mechanical stress on the sacroiliac joint.

What does this test measure?

Gaenslen's test applies a torsional stress to the sacroiliac joint by combining hip hyperextension on one side with maximal hip flexion on the opposite side, while the client lies supine at the edge of the table.

If this maneuver reproduces the client's familiar pain in the sacroiliac area, it's considered a positive provocation sign.

Equipment needed

• A table where the client can position themselves at the edge
• Nothing else

Test protocol

1. The client lies supine, with their buttocks right at the edge of the table
2. Ask them to flex the hip and knee on one side, bringing the knee toward the chest with both hands
3. Let the opposite leg drop off the table, into hip extension (passive hyperextension)
4. Apply gentle, controlled pressure in both directions: push the flexed knee toward the chest and, simultaneously, gently press the hanging leg downward
5. Ask whether this reproduces the client's usual pain in the sacroiliac area
6. Repeat on the other side to compare

Common mistakes

• Applying too much force abruptly, instead of progressive pressure
• Not specifically asking whether the reproduced pain is the same as the one motivating the consultation (and not just normal muscular tension)
• Not comparing both sides

How to interpret the result

Result	Interpretation
Positive: the client's familiar sacroiliac pain is reproduced with the torsion maneuver	Suggests the sacroiliac joint is involved in the pain
Negative: no pain is reproduced, or only nonspecific muscular tension appears	Reduces the likelihood that the sacroiliac joint is the main source of pain

As with most individual sacroiliac tests, its isolated diagnostic accuracy is limited. The usual recommendation is to use a battery of several sacroiliac provocation tests (Gaenslen, compression, distraction, FABER, etc.) and consider the pattern positive if several of them agree.

Relationship with other tests

Gaenslen's test pairs especially well with:

• Sacroiliac traction/compression test — another provocation test, useful for adding evidence
• Gillet's test — to also assess joint mobility, not just pain

Tracking with Movalytics

If a client has recurring sacroiliac pain (typical in runners, sports involving rotation, or postpartum), it's worth documenting which tests reproduce pain and at what intensity in each assessment. In Movalytics you can log the results of your sacroiliac test battery and see whether the pattern of positives changes as treatment progresses.

Frequently asked questions

Is Gaenslen's test safe? Yes, applied with progressive and controlled pressure it's a safe test, although it should be avoided or used with extra caution in people with intense acute pain or suspected fracture. Does a positive Gaenslen confirm sacroiliac dysfunction? Not on its own, but combined with other positive provocation tests, it substantially increases the likelihood that the sacroiliac joint is relevant to the client's pain. Can it be done on pregnant women? It's a test used for pregnancy-related pelvic pain, but pressure should be gentle and adapted to tolerance and stage of pregnancy.