AKA Fajersztajn’s sign: SLR on the painless leg causes contralateral limb pain (a greater degree of elevation is usually required than the painful side). More specific but less sensitive than SLR (97% of patients undergoing surgery with this sign have confirmed HLD 1). May correlate with a more central disc herniation
1)
Rothman RH, Simeone FA. The Spine. Philadelphia 1992