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Pressure mapping as an outcome measure for spinal surgery in patients with myelomeningocele
Jean A Ouellet1, Loren Geller, Willem S Strydom
1McGill Scoliosis and Spine Centre, McGill University Health Centre, Shriners Hospital, Montreal, Canada. jean.ouellet@muhc.mcgill.ca
Insights
Spinal surgery for myelomeningocele patients significantly corrects spinal deformities but does not improve pressure distribution or prevent skin ulcerations. Radiographic correction alone does not guarantee better outcomes for these patients.
Area of Science:
- Pediatric Orthopedics
- Spine Surgery
- Biomedical Engineering
Background:
- Myelomeningocele often leads to complex spino-pelvic deformities.
- These deformities can result in significant skin ulcerations, impacting patient quality of life.
Purpose of the Study:
- To evaluate if enhanced curve correction using third-generation spinal implants improves pressure distribution.
- To determine if improved pressure distribution prevents or resolves skin ulcerations in myelomeningocele patients.
Main Methods:
- Retrospective analysis of prospectively collected data from 19 myelomeningocele patients.
- Patients underwent spino-pelvic deformity surgery and were followed for at least 2 years with regular pressure mapping.
- Standard radiographic measurements and sitting pressure mappings were analyzed using statistical methods.
Main Results:
- Surgery significantly corrected radiographic parameters like Cobb angle and pelvic obliquity.
- Despite radiographic improvements, pressure mapping variables showed only minor changes.
- Overall pressure distribution improved, but not to a clinically significant degree for preventing skin ulcerations.
Conclusions:
- Significant surgical correction of spinal deformities in myelomeningocele patients does not translate to improved pressure distribution or reduced skin ulcerations.
- Pressure mapping may not be a reliable predictor of surgical outcomes in this population.
- Sagittal pelvic orientation and coronal spine balance are key factors influencing pressure distribution.
Study Design:
A retrospective analysis of prospectively collected data on a cohort of 19 myelomeningocele patients undergoing spino-pelvic deformity surgery.
Objective:
To examine if greater curve correction with third generation spinal implants correlate with improved pressure distribution and resolution, or prevention of skin ulcerations in myelomeningocele patients.
Summary Of Background Data:
Children born with myelomeningocele have often complex spino-pelvic deformities leading to skin ulcerations.
Methods:
A cohort of 19 consecutive wheelchair dependent patients with myelodisplastic spinal deformities, who underwent spinal surgery, was prospectively followed with regular pressure mappings for a minimum of 2 years. Standard spino-pelvic radiologic measurements were obtained. Sitting pressure mappings were obtained over the study period using the Force Sensitive Applications from Vista Medical (Winnipeg, Manitoba, Canada). Statistical analysis was done using SAS (SAS Institute Inc, Cary, NC). Paired t-test and Wilcox on Signed Rank test was used where applicable. Significance was taken to be P<0.05.
Results:
Surgery significantly corrected radiographic parameters, specifically, Cobb angle (52%), pelvic obliquity (89%), and to a lesser degree pelvic tilt. Stratifying the data based on fixation type showed that the M-W construct was able to significantly correct pelvic obliquity. While significant changes in radiographic variables were observed after surgery, this was not the case with the various pressure mapping variables. Only minor changes after surgery were observed in the average pressure, maximum pressure, and variable coefficient of pressure. What was observed was an improvement in the overall distribution from anterior/posterior and right/left. While the values only approached statistical significance (P=0.053) for right/left, however, this did not appear to be clinically significant regarding skin ulceration.
Conclusion:
Despite significant surgical corrections in radiographic parameters, these resulted in small changes in pressure distributions and do not appear to influence skin ulceration in the myelomeningocele patient. Pressure mapping may not be a useful tool in predicting outcome of spinal surgery. Factors which were proven to influence pressure distribution are the sagittal pelvic orientation and also achieving coronal spine balance.
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