Sign of the buttock | cyriax.eu

Sign of the buttock

Body: 

The sign of the buttock is part of a combination of findings which indicates serious gluteal pathology. It is considered being a red flag.

The patient suffers from gluteal pain, which may or may not spread down the leg.

We perform the standard functional examination of the lumbar spine :

  • in standing, we notice flexion is painful and limited
  • straight leg raise is also painful and limited. We might suspect a lumbar disorder.
  • However…, passive hip flexion is even more limited than straight leg raise, i.e. a clear sign of the buttock ; the hip rotations also hurt in a non-capsular way.

Because of the positive hip signs, the complete hip examination should be included.  Some resisted hip tests may prove positive.

Interpretation of a sign of the buttock 

  • straight leg raise incriminates a structure behind the hip.
  • The positive passive hip flexion eliminates the nerve roots and the hamstrings as a possible cause of the pain (because, during knee flexion those structures are in a relaxed position).
  • The only structures left we think of are the bony and soft tissue structures of the buttock.

A complementary examination is called for.

What could be the pathology 

  • infection : osteomyelitis of the upper femur, septic sacroiliac arthritis,ischiorectal abscess, septic gluteal bursitis
  • neoplasm at the ilium or at the upper femur
  • fractured sacrum.

This clearly illustrates the importance of performing the passive hip tests immediately after having tested the straight leg raise in the lumbar examination. Hip tests are not just hip tests, but enable us to discover serious local pathology in the buttock.

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