A Clinical Study to Evaluate Safety and Performance of PEEK-OPTIMA™ HA Enhanced Interbody Cages in the Lumbar Spine

Inclusion Criteria: * Is the subject aged 18 years of age or older and skeletally mature? * Does the subject have a primary diagnosis of symptomatic degenerative disc disease (DDD) or symptomatic degenerative disc disease (DDD) with spondylolisthesis (Grade 1) at one or two contiguous levels from L2 to S1? * Does the subject have discogenic back pain with degeneration of the disc confirmed by medical history, radiographic examination and MRI (MRI must be obtained within the 6 months prior to subject surgery and radiographs obtained within 3 months prior to subject surgery)? * Is the subject judged by the Investigator to be suitable for transforaminal lumbar interbody fusion (TLIF) surgery based on their medical history? * Is the subject indicated for surgical treatment with the EVOS Lumbar Interbody System with autologous bone graft? * Has the subject completed at least 6 months of conservative non-operative treatment without obtaining adequate symptomatic relief? * If the subject is female and of childbearing age, do they have a negative pregnancy test (by Beta HCG qualitative analysis), or do they have a history of a surgical sterilisation, or a history of no menses in the past twelve months? * Is the subject, in the opinion of the Investigator, able to understand this clinical study, co-operate with the procedures and are they willing to return to the hospital for all the required post-operative follow-ups? * Is the subject able to give voluntary, written informed consent…