LONG TERM OUTCOME AFTER DISPLACED SACRAL FRACTURES TREATED WITH INTERNAL FIXATION

Introduction

Displaced fractures in the sacrum are associated with other intra-pelvic organ injuries. There are some reports on short term outcome, however there is little knowledge about the long-term morbidity after these severe injuries.

Aims of study

1. -

   Describe neurologic deficits in the lower extremities and impairments involving the uro-genital, bowel and sexual functions a minimum of 8 years after injury.

2. -

   Compare the long-term results with our previously published results after one-year follow-up (1).

Materials and methods

39 consecutive patients with displaced sacral fractures were prospectively registered at Oslo university hospital, Ullevaal between 1996 and 2001. Tötterman et al. published 1-year results on 32 of the 39 patients(1). In the present study we followed 29 of these 32 patients for 8 years or more. The following evaluation instruments were used: Neurology: Sensorimotor function was classified according to ASIA score. Bladder function: Structured questionnaire with regards to frequency, urge or incontinence. Also, flowmetry and ultrasound were done to determine maximum flow and post-micturition volume. Bowel function: Structured questionnaire with regards to frequency, urge, diarrhea, constipation and incontinence. Sexual function: Open questions to address any problems associated with sexual function. For male patients, selected questions from the International Index of Erectile Function were used.

For comparison with previous data from the one year follow-up we used the Wilcoxon Signed-rank test for non-parametric data.

Results

Neurology: 26 patients had neurologic deficits in the lower extremities. Two patients were not testable and only 1 was asymptomatic. Bladder function: 5 had slightly changed, 11 significantly changed and 4 completely changed voiding pattern. Bowel function: 6 had slightly changed and 3 completely changed bowel pattern. Comparing our results with previous data showed deterioration in voiding function over time in 38%(p=0.005), improved bowel function in 28%(p=0.047) and no significant changes in neurological deficits (p=0.47). Sexual function: 45% reported sexual dysfunction versus 38% at the 1-year follow-up.

Conclusion

Neurologic deficits, uro-genital and bowel dysfunction are frequent after displaced sacral fractures. Voiding and sexual problems deteriorated over time, while bowel function improved, and neurological deficits showed no significant changes. Pathologic bladder function may cause irreversible structural damage to the bladder, and subsequent impaired renal function. These problems should therefore be addressed early in the rehabilitation period and the patients must be followed by adequate expertise for many years after the injury.