In patients with leg (+/− back) pain suspected of having lumbosacral nerve root compression, a finger-floor distance of > 25 cm when the patient bends forward and attempts to touch the floor with the fingers has been found an independent predictor of radiological (MR imaging) compression. This was not the case for the straight leg raising test.
Vroomen PCAJ, de Krom MCTFM, Wilmink JT, Kester ADM, Knottnerus JA. Diagnostic value of history and physical examination in patients suspected of lumbosacral nerve root compression. Journalof Neurology, Neurosurgery and Psychiatry 2002; 72: 630-634