BackgroundThe　use　of　external　fixators　to　treat　foot　and　ankle　deformities　remains　a　challenge　in　orthopedic　surgery　due　to　their　diversity.　We　hope　to　improve　the　automation　and　accuracy　of　the　correction　process.　MethodsA　three-degree-of-freedom　(3-DOF)　electromotor-driven　external　fixator　for　uniplanar　foot　and　ankle　deformities　was　proposed.　Computer-assisted　correction　software　was　developed　to　help　surgeons　use　digital　technology　to　measure　the　required　parameters　from　patients＇　X-ray　radiographs.　The　correction　trajectory　and　the　prescriptions　were　generated　in　the　software　based　on　the　proposed　correction　strategy.　ResultsTwo　clinical　cases　were　simulated　to　verify　the　correction　ability　of　the　developed　external　fixator.　The　results　showed　that　the　angular　and　displacement　deformities　were　well　corrected.　ConclusionsThe　developed　external　fixator　can　accurately　and　automatically　correct　foot　and　ankle　deformities　with　the　help　of　computer-assisted　correction　software,　which　significantly　reduces　the　burden　on　surgeons　and　patients.