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ARTICLE49.29 years).Inclusion criteria were either isthmic or degenerative spondylolisthesis after failed conservative management for >6 months.Exclusion criteria were 70 years of age, instability of more than two levels, dysplastic or pathologic type of spondylolisthesis, previous spine surgery, and moribund patients.The procedure was explained to the patients, and proper consent was obtained.Preoperative visual analog scale (VAS) and functional status using the Oswestry Disability Index (ODI) short form-12 (SF-12) questionnaire were documented, and thorough physical and neurological examination was done.Lumbosacral (LS) spine stress (flexion-extension) view X-rays (Fig. 1 and Table 1) were done to assess instability and pelvic parameters (lumbar lordosis, slip IntroductIonSpondylolisthesis is one of the major causes of low-back aches, mostly in the later part of middle (productive) age.Lumbar instability is not seen in all cases of spondylolisthesis.This segmental instability is associated with chronic low-back pain with or without radiculopathy.Since the evolution of modern orthopedic instrumentation, many surgical techniques have been adopted for lumbar instability to give such patients a pain-free life and early return to their routine.Among these, transforaminal lumbar interbody fusion (TLIF) is well-documented and accepted in the literature as it provides circumferential stabilization in a single incision. 12]3456 TLIF is also regarded safer than other surgeries on the spine due to its approach.Intervertebral cages of various materials also have been introduced to augment the stability.Polyether ether ketone (PEEK) cage with its modulus of elasticity, equivalent to cancellous bone, has been used as an alternative to titanium. 7,8However, not much has been documented regarding TLIF surgeries with PEEK cages.We aim to study the functional outcomes after TLIF with PEEK cage fixation in patients operated on for lumbar segmental spondylolisthesis and correlate radiologically by assessing fusion, implant position, and complications. MaterIals a n d MethodsA total of 38 patients (11 males and 27 females) were included in this study.The age-group ranged between 30 and 67 years (mean age-1-
Chandraprakash et al. (Fri,) studied this question.