Benchmarking Multimodal Vision Frontier Models With Lumbar Spine MRIs for Grading Lumbar Spinal Stenosis. - Gebhard H; Kartal A; Manalil NF; Chung LK; Daulat SR; Cheng CD; Waheed AA; Shahzadi A; Hussain I; Härtl R; Elsayed GA (Global spine journal, 2026)