Changes of Spinopelvic Parameter using Iliac Screw In Surgical Correction of Sagittal Imbalance Patients

STUDY DESIGN: A retrospective-based study. OBJECTIVES: To evaluate the usefulness of iliac screws in the surgical correction of sagittal imbalance by changes of spinopelvic parameters. SUMMARY OF LITERATURE REVIEW: Although reports exist regarding the fusion rates on lumbosacral fusion by iliac screws, no previous studies address the issue of changes of spinopelvic parameters on surgical correction of sagittal imbalance by iliac screws. MATERIALS AND METHODS: We analyzed a total of 23 patients who were operated on by pedicle subtraction osteotomy and posterior fusion on sagittal imbalance. Patients were divided into two groups: 1) non-iliac screw fixation and; 2) iliac screw fixation. The two groups were compared during the preoperative and postoperative stages, and the last follow-up spinopelvic parameters of two groups. RESULTS: Spinopelvic parameters, except for pelvic incidence, were corrected after surgery; some corrected values of spinopelvic parameters were lost during follow-up. There was a statistically significant difference in the last follow-up period between lumbar lordosis and pelvic tilt. Values of postoperative lumbar lordosis and pelvic tilt was similar to each other; however, during the follow-up period corrected values of spinopelvic parameters of non-iliac screw fixation group were more lost. There were no statistically significant changes in postoperative and last follow-up sacral slope and pelvic incidence. CONCLUSIONS: Sagittal imbalance could be corrected by pedicle subtraction osteotomy, and corrected values of lumbar lordosis and pelvic tilt of iliac screw fixation group could be maintained well compared to non-iliac screw fixation. Iliac screw fixation could be useful for maintenance of corrected values of spinopelvic parameters in surgical correction of sagittal imbalance.

Anatomic Single Bundle Anterior Cruciate Ligament Reconstruction by Low Accessory Anteromedial Portal Technique: An In Vivo 3D CT Study

PURPOSE: Proper femoral tunnel position is important for anatomical reconstruction of the anterior cruciate ligament (ACL). The purpose of this study was to evaluate the positions of femoral and tibial tunnels created using an accessory anteromedial portal technique in single bundle ACL reconstruction. MATERIALS AND METHODS: The femoral tunnel was targeted at the mid-portion of the ACL bundles. We evaluated postoperative computed tomography scans of 32 patients treated by ACL reconstruction using a free-hand low accessory anteromedial portal technique. On the tibial side, the tunnel position was evaluated using Tsukada's method. On the femoral side, the position was evaluated using 1) the quadrant method, 2) Mochizuki's method, 3) Mochizuki's method, and 4) Takahashi's method. Tunnel obliquity was also evaluated. RESULTS: The mean tibial tunnel position was located at 44.6%+/-2.5% anterior from the anterior margin and 48.0%+/-3.0% in medial from the medial margin. The mean femoral tunnel position was located at the center between the anteromedial and posterolateral bundles: Quadrant method, 26.7%+/-2.7%/30.0%+/-2.9%; Watanabe's method, 37.7%+/-2.5%/26.6%+/-2.2%; Mochizuki's method, 38.7%+/-2.7%; Takahashi's method, 21.8%+/-2.2%. The mean femoral tunnel obliquity was 57.7degrees+/-6.2degrees in the sagittal plane and 49.9degrees+/-5.6degrees in the coronal plane. CONCLUSIONS: In anatomic single bundle ACL reconstruction, the low anteromedial portal technique can restore accurate position of the native footprint. Accurate femoral tunnel position facilitates recovery of stability and decreases graft failure rate.

Eleven Levels of Spinous Process Fractures in Thoracolumbar Spine

Cases of over 5-level spinous process fractures are extremely rare. Thoracolumbar region of spine is superimposed on ribs; and as such additional studies such as computerized tomography are needed to diagnose fractures in this region. We report a case of 11 contiguous level thoracolumbar spinous process fractures, which has been treated conservatively.

Complications of Iliac Screw in Spinopelvic Fixation With Adult Spinal Deformity: Complications of Iliac Screw in Spinopelvic Fixation

STUDY DESIGN: Retrospective study. OBJECTIVES: To evaluate clinical & radiologic significance about complications of spinopelvic fixation with iliac screw in patients with adult spinal deformity. SUMMARY OF LITERATURE REVIEW: Complications of iliac screw fixation in adult spinal deformity patients was obscure in spite of the good results of iliac screw fixation. MATERIALS AND METHODS: We analyzed 27 patients, followed over 1-year, with adult spinal deformity (lumbar degenerative kyphosis, degenerative lumbar scoliosis, flat back syndrome). The study was done for complications of iliac screw fixation by clinical and radiological evaluations. RESULTS: Post-operative iliac screw prominence were 15 cases (55.5%), iliac screw breakage was 1 case (3.7%), bursitis was 1 case (3.7%), sacroiliac joint pain were 5 cases (18.5%), halo sign around iliac screw were 23 cases (85.1%), and 3 cases (11.1%) were performed reoperation. There was no significance between halo sign and sacroiliac joint pain. CONCLUSIONS: Iliac screw fixation is a very useful operative method without severe complications on spinopelvic fixation. There are some complications of iliac screw fixation and iliac screw prominence is a most common problem, but few counterplan exits. So, further studies about reducing complication method, management protocols of iliac screw complication were needed.