Application of a new anatomic hook-rod-pedicle screw system in young patients with lumbar spondylolysis: A pilot study

Figure 4 Typical case. A 21-yr-old male patient had recurrent low back pain for more than 2 yr. A: Two-dimensional computed tomography scan showed lumbar spondylolysis at bilateral L4 and L5 levels; B: Lumbar magnetic resonance imaging showed normal signals of all lumbar intervertebral discs; C: Lateral radiograph after lumbar surgery; D: Anteroposterior radiograph of lumbar spine after operation; E: Computed tomography scan of the lumbar spine at 6 mo after lumbar operation showed the healing of the bone graft in the L4 isthmus; F: Computed tomography scan of the lumbar spine at 6 mo after lumbar operation showed the healing of the bone graft in the L5 isthmus; G: 12 mo after the operation the lateral radiograph showed that the internal fixation had been removed; H: 12 mo after the operation, magnetic resonance imaging showed that the signals of all lumbar intervertebral discs were normal.