Patients with acute lower-back pain who have undergone routine conventional drug treatment at the first visit to the emergency department (49 patients). The drug treatment consists of analgesic-anti-inflammatory (diclophenac sodium 75 mg IM) and myorelaxant (thiocolchicoside 4 mg IM), administered only once.

Patients, who received chiropractic treatment immediately after the conventional drug treatment as in the control group (49 patients). The chiropractic treatment consists of high speed and low amplitude spinal manipulation techniques, applied only once.

Single intramuscular injection of mixture of two commercial drugs (Analgesic-anti-inflammatory and myorelaxant) at the specified dosages

Visual Analogue Pain Scale (VAS) assessment at the fifth minute after the injection of drug. Visual Analogue Scale (VAS) is a measurement instrument that tries to measure a characteristic or attitude that is believed to range across a continuum of values and cannot easily be directly measured. It uses a ten centimeter scale with a minimum of 0 indicating no pain and a maximum of 10 indicating worst pain.

Visual Analogue Pain Scale (VAS) assessment at the fifth minute after the injection of drug. Visual Analogue Scale (VAS) is a measurement instrument that tries to measure a characteristic or attitude that is believed to range across a continuum of values and cannot easily be directly measured. It uses a ten centimeter scale with a minimum of 0 indicating no pain and a maximum of 10 indicating worst pain.