Retrospective study that the PI decided not to proceed with

This is a retrospective chart review to determine the non-inferiority of performing lower extremity peripheral nerve block placement under spinal anesthesia compared to its pre-spinal counterpart.

This is a retrospective chart review to determine the non-inferiority of performing lower extremity peripheral nerve block placement under spinal anesthesia compared to its pre-spinal counterpart.

Primary outcome:

- The investiigators will be looking into persistent abnormal neuropathic symptoms lasting more than 7 days following a sciatic popliteal nerve block.

Inclusion Criteria:

• ambulatory foot surgery
• ambulatory ankle surgery
• use of spinal Anesthesia
• use of pre-spinal anesthesia nerve block techniques
• use of sciatic nerve block

Exclusion Criteria:

• all other surgeries

The investigators plan to analyze data for patients who underwent ambulatory foot or ankle procedures with the use of spinal anesthesia and sciatic nerve block in the popliteal fossa at HSS between March 1, 2016 and February 24, 2020