THE CLINICAL RESULTS OF DEGERATIVE LUMBAR INSTABILITY PATIENTS TRETED WITH POSTEROLATERAL FUSION AND POSTERIOR SEGMENTER INSTRUMENTATION Journal title: Journal of Turkish Spinal Surgery Authors: İ. Teoman BENLİ, Alper KAYA, Berk GÜÇLÜ, Doğaç KARAGÜVEN, Murat KÖKEN Subject(s): Medicine, Surgery