Introduction. The degeneration of the adjacent segment in lumbar spine with spondylodesis is well known, though the exact incidence and the mechanism is not clear. Several implants with semi rigid or dynamic behavior are available to reduce the biomechanical loads and to prevent an adjacent segment disease (ASD). Randomized controlled trials are not published. We investigated the biomechanical influence of dynamic and semi rigid implants on the adjacent segment in cadaver lumbar spine with monosegmental fusion (MF). Materials and Methods. 14 fresh cadaver lumbar spines were prepared; capsules and ligaments were kept intact. Pure rotanional moments of ±7.5 Nm were applied with a Zwick 1456 universal testing machine without preload in lateral bending and flexion/extension. The intradiscal pressure (IDP) and the range of motion (ROM) were measured in the segments L2/3 and L3/4 in following situations: in the native spine, monosegmental fusion L4/5 (MF), MF with dynamic rod to L3/4 (Dynabolt), MF with interspinous implant L3/4 (Coflex), and semi rigid fusion with PEEK rod (CD Horizon Legacy) L3-L5. Results. Under flexion load all implants reduced the IDP of segment L2/L3, whereas the IDP in the segment L3/4 was increased using interspinous implants in comparison to the other groups. The IDP was reduced in extension in both segments for all semi rigid or dynamic implants. Compared under extension to the native spine the MF had no influence on the IDP of the adjacent disc. The rod instrumentation (Dynabolt, PEEK rod) lead to a decreased IDP in lateral bending tests. The ROM in L3 was reduced in all groups compared to the native spine. The dynamic and semi rigid stabilization in the segment L3/4 limited the ROM more than the MF. Discussion. The MF reduced the ROM in all directions, whereas the IDP of the adjacent segment remained unaffected. The support of the adjacent segment by semi rigid and dynamic implants decreased the IDP of both segments in extension mainly. This fact is an agreement with other studies. Compared to our data, no significant effect on the adjacent levels was observed. Interestingly, in our study, the IDP of the adjacent segment is unaffected by MF. The biomechanical influence in the view of an ASD could be comprehended, but is not completely clear. The fact of persistent IDP in the adjacent segment suggests that MF has a lower effect on the adjacent segment degeneration as presumed. Biomechanical studies with human cadaver lumbar spines are limited and depend on age and degenerative situation. The effect on supporting implants on adjacent segment disease in lumbar spine surgery has to be investigated in clinical long term studies

Introduction. Correction and arthrodesis for cervical kyphosis associated with atetoid cerebral palsy has been considered to be difficult because of their involuntary neck movements and severe deformity. The aim of this study is to evaluate the surgical outcome of midline T-saw laminoplasty and posterior arthrodesis using pedicle screws. Methods. 15 patients were retrospectively reviewed. There were 6 women and 9 men, with a mean age 52.9 years (range 31–71 years). Mean follow-up period was 43 months (range 24–84 months). For clinical evaluation, the Japanese Orthopaedic Association (JOA) score and Barthel index (BI) which shows independence in ADL were used. For radiographic evaluation, change of C2–C7 Cobb angle of sagittal alignment, adjacent segment instability after the surgery were evaluated. Results. The average JOA score improved significantly from 6.2 preoperatively to 10.5 postoperatively. The average BI improved from 44.2 before surgery to 72.5 after surgery. C2–C7 Cobb angle of sagittal alignment measured 12.3 degrees of kyphosis preoperatively and 1.2 degrees of lordosis postoperatively. Solid posterior bony fusion was achieved in all cases. There was two cases of adjacent segmental instability, which required additional surgery. Seven (5.6%) out of the 125 inserted screws showed more than 2mm deviation. However, there were no neurovascular complications during or after surgery in any cases, and all cases maintained strong internal fixation. Conclusion. Midline T-saw laminoplasty and posterior arthrodesis using pedicle screw is a favorable option for the patient with kyphotic deformity associated with atetoid cerebral palsy, as it preserves cervical alignment, and improve neurological status and ADL

Introduction. Because it typically afflicts older patients with poorer health and/or risk factors, spondylodiscitis can become life threatening. Lingering symptoms, which can be attributed to residual destruction as well as concurrent degenerative changes in the adjacent segments after inflammation has subsided, are frequently present after both conservative and operative therapies. Here, quality of life outcomes are presented for patients two years after operative and conservative treatment. Methods. 82 patients with spondylodiscitis were included prospectively from 01/2008. 28% of patients were treated conservatively (Group 1) and 72% operatively (Group 2). Clinical findings, SF-36, ODI, COMI, and a visual analog scale (VAS) were evaluated and compared between the groups at admission and follow-up (2 year FU). Results. Average patient age was 64.9 ± 6.3 years. Average inpatient hospital stay was 26.5 ± 16.9 days. Neurologic deficits were present in 39.0% of patients preoperatively and 18.3% at FU. Abscess formation was diagnosed in 89.0% of cases and intraspinal abscesses in 43.9%. Hospital mortality was 11.0% and total mortality 14.6% at FU. 6.1% of cases were lost to FU. The preoperative ODI scores averaged 75.4 ± 16.6, and did not vary significantly between the groups. At FU, with 33.9 ± 21.2, average score was significantly better (p<0.001). On the SF-36, preoperative average scores were PCS 25.7 ± 7.1 and MCS 37.3 ± 13.4, and at FU PCS 43.5 ± 10.1 (p<0.05) and MCS 47.7 ± 14.8 (p<0.05). COMI scores also showed significant (p<0.001) improvement (preoperatively 9.2 ± 1.0 and at FU 3.5 ± 2.2). On comparison, patients in Group 2 (VAS 8.3) preoperatively had more pain (p<0.05) than those in Group 1 (VAS 6.3), but there was no significant difference at FU (group 2 VAS 2.5 and group 1 VAS 3.0). Over 90% of operated patients reported that treatment helped, while over 30% of conservatively treated patients said that treatment helped a little or not at all. Discussion. In the pre-antibiotics era, the prognosis for spondylodiscitis was poor. Currently, it can still lead to serious health problems and become life threatening. Quality of life and physical limitations are markedly worse than for the general population. Compared to patients treated conservatively, patients treated with surgery have somewhat improved quality of life and significantly better patient satisfaction