Modifications on cervical spine sagittal alignment after magnetic growing rod instrumentation. Is there a correlation with proximal giunctional kyphosis?

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Presentation transcript:

Modifications on cervical spine sagittal alignment after magnetic growing rod instrumentation. Is there a correlation with proximal giunctional kyphosis? Konstantinos Martikos, Emanuela Pipitone, Francesco Lolli, Elena Maredi, Francesco Vommaro, Mario Di Silvestre, Tiziana Greggi Dr. Tiziana Greggi Spine Surgery Division – Rizzoli Orthopaedic Institute Bologna

Introduction The purpose of this study was to examine a possible correlation between cervical spine sagittal modifications and proximal un-instrumented thoracic spine behavior in patients treated with magnetically controlled growing rod (MCGR) constructs.

Material And Methods We reviewed retrospectively 6 consecutive patients treated with MCGR constructs, affected by early onset idiopathic scoliosis, focusing on changes upon: cervical spine lordosis (CL) calculated from C2 lower endplate to C7 lower endplate) proximal thoracic junctional kyphosis (JK) calculated as the angle between the vertebral endplates of two levels above and two levels below the proximal instrumented vertebra. Scoliosis magnitude expressed in Cobb angle, CL and JK were calculated before and after operation and at final follow up (FU). CL JK

Material And Methods A possible correlation between CL and JK was evaluated. All data were analyzed by SAS version 9.2. Non-parametric correlation (Spearman's rho) was used to correlate: post-op CL variation (i.e. post-op value – pre-op value) to post-op JK variation FU CL variation (i.e. FU value – post-op value) to FU JK variation. P < 0.05 was considered statistically significant

Results Patients’ age ranged from 4 to 11 years. Mean FU was 15 months (min 12 - max 19). Main thoracic scoliosis was corrected from 62.7° to 32.0°. Mean post-op CL variation was 15.7° (±11.2°, min 6.0° max 33.0°) while mean post-op JK variation was 0.95° (±8.3°, min -10.0° max 15.0°): no statistical correlation was found between these two parameters. Mean FU CL variation was -20,0° (±13.5°; min -43.0° max -3.0°) and mean FU JK variation was 16.4° (±8.6°, min 7.8° max 30.1°): a statistically significant correlation was found between these two parameters (rho=-0.82857, p=0.0416). JK was always asymptomatic.

Patient, male 4 years old FU Pre - op Post - op

Patient, male 4 years old CL: 3° -14° -30° PJK: 22° 20° 38°

Conclusions A statistically significant correlation was found between JK and progressive increase in cervical spine lordotic alignment over time. This finding may suggest that cervical lordosis increases over time in order to compensate PJK. Future studies upon larger number of patients and longer FU must be carried out in order to confirm this theory. In the immediate post-operative radiographic controls, non statistical correlation was found between JK and CL, wich may indicate that correlation between these variables takes place at long-term rather than short-term. Scoliosis correction was statistically significant in all patients.