The five-in-two (FIT) ankle block for outpatient foot surgery: a proof-of-concept anatomical and observational study
Authors' conclusion
The anatomically guided FIT ankle block is an effective proximal motor-sparing regional anesthesia technique for outpatient foot surgery, providing reliable anesthesia, excellent analgesia, and well-tolerated perioperative outcomes.
Study context
- Population
- Adults undergoing outpatient foot surgery
- Participants
- 80 adults
- Outcome
- Surgical anesthesia
Methodological detailsanatomical study, bicentric, proof-of-concept
- Anatomical study
- Bicentric
- Proof-of-concept
Main finding
As reported in the abstract
Successful surgical anesthesia
FIT ankle block
96%
77 of 80
Observational data: associations, not effects.
Secondary outcomes
Sensory block duration
- Median sensory block duration, minutes
- 554 (420-758)
Motor block duration
- Median motor block duration, minutes
- 600 (444-882)
Pain during block placement (VAS)
- Median VAS during block placement
- 0 (0-7)
Pain on arrival in PACU (VAS)
- Median VAS on arrival in PACU
- 0 (0-4)
IV rescue analgesia
- IV rescue analgesia required
- 5%
Patient-reported experience (EVAN-LR global score)
- Median Echelle du Vécu de l'Anesthésie LocoRégionale global score
- 88 (80-97)
Safety
Block-related complications
- Complication rate
- 0% (95% CI 0 to 3.75%)
Original publication
The five-in-two (FIT) ankle block for outpatient foot surgery: a proof-of-concept anatomical and observational study. Reg Anesth Pain Med. Published 19 August 2026. doi:10.
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