Objective:　To　compare　the　mechanical　effects　of　metatarsal　deficit　and　its　reconstruction　with　ilium,　fibula　and　scapula　on　foot　function　using　three-dimensional　(3-D)　finite　element　analysis.　Methods:　Deficits　of　the　first　to　the　third　metatarsal　bone　and　the　fourth　to　the　fifth　metatarsal　bone,　and　their　reconstructions　with　ilium,　fibula　and　scapula,　respectively,　were　simulated　by　a　3-D　foot　model.　The　peak　displacement　and　the　peak　stress　were　defined　as　indexes　to　estimate　foot　function.　Results:　It　was　found　that　foot　function　was　affected　primarily　by　the　deficit　of　the　first　to　the　third　metatarsal　bone.　In　comparison　with　the　intact　healthy　foot,　the　peak　displacement　and　the　peak　stress　of　the　whole　deficit　of　the　first　to　the　third　metatarsal　bone　increased　by　215　and　212%,　respectively,　while　those　of　the　half　deficit　increased　by　165　and　205%,　respectively.　For　the　whole　and　the　half　deficit　of　the　fourth　to　the　fifth　metatarsal　bone,　the　values　of　the　two　indexes　increased　by　144　and　109%,　and　137　and　103%,　respectively.　After　reconstruction,　the　results　showed　that　the　stress-concentrated　regions　dispersed　relatively,　especially　in　heel,　metatarsal　heads　and　reconstructive　bone　block.　The　maximum　displacement　and　stress　of　the　deficit　rebuilt　by　ilium　were　the　minimums　in　comparison　with　the　reconstructions　with　fibula　and　scapula.　Conclusion:　The　reconstructed　multi-metatarsal　deficit　can　be　analysed　by　finite　element　method.　The　ilium　was　the　preferred　reparation　material　for　the　bone　deficit.　Copyright　(c)　2006　John　Wiley　&　Sons,　Ltd.