Incremental Contribution of the Minnesota Multiphasic Personality Inventory - 3 to Predicting One-Year Postoperative...

Area of Science:

• Psychology
• Neurosurgery
• Pain Management

Background:

• Pre-surgical psychological assessments are increasingly standard for spinal cord stimulator interventions in the U.S.
• The Minnesota Multiphasic Personality Inventory (MMPI) has shown value in predicting surgical outcomes for chronic back pain.
• The latest MMPI version, MMPI-3, requires further investigation for its predictive utility in this context.

Purpose of the Study:

• To evaluate the predictive validity of the MMPI-3 for post-surgical outcomes in patients undergoing interventions for chronic back pain.
• To determine if MMPI-3 scores add predictive value beyond pre-surgical clinical measures.

Main Methods:

• A cohort of 909 patients completed the MMPI-3 and self-report measures of pain, disability, and emotional functioning pre-surgery.
• The same measures were readministered one year after surgical intervention.
• Statistical analyses examined the MMPI-3's contribution to predicting outcome variance.

Main Results:

• MMPI-3 scale scores explained up to 9% of the variance in post-surgical outcomes, controlling for pre-surgical data.
• Emotional/internalizing dysfunction, somatic dysfunction, and externalizing dysfunction on the MMPI-3 were significant predictors of poorer outcomes.
• Higher scores in these areas indicated a greater likelihood of negative post-surgical results.

Conclusions:

• The MMPI-3 is a valuable tool for pre-surgical psychological assessments in chronic back pain patients.
• MMPI-3 results can enhance the prediction of surgical outcomes, particularly identifying risks associated with psychological and somatic dysfunction.
• These findings support the integration of MMPI-3 assessments into pre-operative evaluations to better anticipate patient outcomes.