Straight leg raise

The Lasègue characters (including Lasègue test, Lazarević characters or Lasègue Lazarević 's sign) describes a possible elongation pain of the sciatic nerve and / or spinal nerve roots in the lumbar and sacral segments of the spinal cord as part of an investigation from orthopedics, neurology and rheumatology, the Lasègue Lazarević test.

The name of the character go to the French internist Ernest -Charles Lasègue (1816-1883) and the Serbian neurologists Laza Lazarević Kuzman (1851-1890) back.

Implementation

The patient lies flat on his back. The extended leg is passively flexed to 70 ° at the hip joint. In berichtetem pain diffraction will not continue until the physiologically possible diffraction. If there is pain in the leg up to an angle of about 45 degrees, which are sharp, from the back inject in the leg and radiate the knee to below, the test is positive, and is called Lasègue characters. As a cause of pain in this case the elongation of the sciatic nerve (sciatic ) is seen. When pain indication at an angle of 60-70 ° is spoken by a Pseudolasègue or by a pseudo positive Lasèguezeichen; this may be also be a strain pain of the hamstrings muscles.

Pure pain of non- einschießendem character in the leg or thigh should be seen as muscle strain pain. The possible Lasègue character is intensivierbar by simultaneous internal rotation of the leg; also by dorsiflexion of the foot (so-called Bragard characters). The angle at which employs the pain is noted. The pain generally results in a reflex motion resistance. There are L4/L5 or L5/S1 compresses the nerve roots of the segments.

The Lasègue test can be positive for sciatica, a herniated disc or a meningeal irritation as meningitis or subarachnoid hemorrhage.

When inverted Lasègue character ( reverse Lasègue ) the triggering pain with flexion at the knee joint is stretched at the hip joint (the patient lies flat and the abdomen) as a strain character of the femoral nerve ( compression of the nerve roots L3/L4 ) refers.