INTRODUCTION: At the AAHS meeting in Coronado, Ca. in January of 2001 Dr. Joseph Imbriglia described his CMC arthroplasty. It consisted of 1/4 to 1/3 distal trapezectomy, imbrication of the CMC capsule to the FCR, and transfer of the EPB to the flexor side of the proximal phalanx. The modification to Imbriglia's arthroplasty involves imbricating the ulnar most slip of the APL to the FCR and using the remaining tendon as an "anchovie", and reefing the other slips of the APL to give the MC an abduction vector. MATERIAL & METHOD: Between January 2001 and January of 2003 15 modified Imbriglia CMC arthroplasties were performed by the author. All CMC joints were classified as either Eaton grade II or III. There were 13 female and 1 male patients. One patient, the male, had bilateral CMC arthroplasties. Nine of fourteen had worker's compensation insurance. Eight were dominant and 7 were non-dominant. Post-operative care consisted of a post-operative thumb spica splint for two weeks until sutures were removed. Then, four weeks of a removable thumb spica splint with exercises of the MCP and DIP twice in the morning, afternoon and in the evening. All 14 charts were reviewed and patients called back for re-evaluation as to residual pain, CMC subluxation, hyper-extension deformity of the MCPJ, return to original job,grip strength, pinch strength, injury to the radial sensory nerve, and overall satisfaction of procedure. RESULTS; Three of fifteen had minimal residual pain. None of the fifteen had subluxation of the MC on the residual trapezium. None had a tendency to hyperextension of the MCPJ. All nine of the WC patients returned to their original job without job modification. The grip strength and the pinch strength on the operated side was stronger than the non-operated side on those patients that had arthritis on the opposite side, seven of fifteen patients. The grip strength and pinch stregth remained lower that the opposite side if there was no arthritis in the CMC joint, seven of fifteen. The bilateral patient had stronger strength on both sides. All of the fifteen patients would have the procedure repeated CONCLUSION; The modification to the Imbriglia CMC arthroplasty seems to give excellent preliminary results in Eaton's Grade II & III arthritis.