The Collaborative International Dictionary of English v.0.48:
Arthrodesis \Ar*throd"e*sis\, n. [NL., fr. Gr. ? joint + ? a binding together.] (Surg.) Surgical fixation of joints. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
arthrodesis n 1: the surgical fixation of a joint which is intended to result in bone fusion