Spondylolysthesis is in simple language unstable spine with slipping of One vertebra over other in the spinal column. Common site is L5/S1 and L4/5. This causes chronic back ache and when not treated progresses to increasing grades of slip with leg pains also. Affects young individuals due to Pars interarticularis fracture of vertebrae, causing unstable posterior elements and spinal column. See the Young lady suffering from Two level (L4 and L5 ) B/L Pars Interarticularis fracture, with Gr-1 SPONDYLOLYSTHESIS L5/S1 treated by TLIF and decompression and fixation walking comfortably 2 days after surgery!
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