It has been a long held view that spinal and epidural anesthesia reduce thromboembolism but a current study seeks to quantify this. However it seems to be a weak effect with a Number Needed to Treat of 500.
30 day readmission rates (but not mortality) were also reduced.
Neuraxial anesthesia may contribute to thromboembolism reduction but should not be the sole prophylaxis. And of course the ASRA guidelines for its use with anticoagulants enter the equation.