A new evaluation method for lumbar spinal instability: passive lumbar extension test.

Area of Science:

• Orthopedics
• Spinal Surgery
• Diagnostic Imaging

Background:

• Lumbar spinal instability diagnosis relies on clinical measures, but their accuracy is often uninvestigated.
• Few studies assess the sensitivity and specificity of clinical tests for lumbar instability.

Purpose of the Study:

• To evaluate the diagnostic accuracy of the novel passive lumbar extension (PLE) test.
• To determine the sensitivity, specificity, and positive likelihood ratio of the PLE test for lumbar spinal instability.

Main Methods:

• The PLE test was performed on 122 subjects with lumbar degenerative diseases.
• Subjects were categorized into instability-positive and instability-negative groups based on flexion-extension lumbar spine films.
• Sensitivity, specificity, and positive likelihood ratio were calculated for the PLE test and other clinical signs.

Main Results:

• The PLE test demonstrated a sensitivity of 84.2% and specificity of 90.4%.
• These diagnostic accuracy metrics surpassed those of other evaluated clinical signs.
• The positive likelihood ratio for the PLE test was 8.84 (95% CI: 4.51–17.33).

Conclusions:

• The passive lumbar extension (PLE) test is a highly effective clinical examination for diagnosing lumbar spinal instability.
• The PLE test offers a practical and easily implementable diagnostic tool for outpatient clinical settings.