The conditions he treats include scoliosis, kyphosis, flat-back syndrome, chin-on-chest deformity, cervical disc herniation, cervical stenosis, ossification of the posterior longitudinal ligament (OPLL), lumbar disc herniation, spinal stenosis, spondylolisthesis and other spinal pathologies. Trained in neurological and orthopedic spine surgery, Tan can assess patients from an interdisciplinary perspective.