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In his seminal paper, Gordon Waddell describes a test for assessing non-organic physical findings in low back pain by comparing passive knee extension while the examinee is sitting versus performing a supine straight leg raise. The sitting test is done with distraction, where the examiner may claim to check the knee or foot, while the supine test involves passive hip flexion with the knee extended. The final positions of the examinee in both tests are nearly identical, and symptomatic results should align. Discrepancies between the sitting and supine tests may indicate non-organic findings, highlighting the importance of consistent results in evaluations.
