Orthopaedics Classification of Bone Tumors ed185f39 Most common tumor in bones of hand: A Exostosis B Giant cell tumor C Enchondroma D Synovial sarcoma High-Yield Explanation (c) EnchondromaEnchondromas are most common type of hand bone tumor.- Phalanges of hand are involved most commonly and the proximal phalanx is the most common site.