Proximal interphalangeal joint arthroplasty with Tactys ® : Clinical and radiographic results with a minimum follow-up of 12 months.

The Tactys® implant is a total anatomic gliding and modular prosthesis for proximal interphalangeal (PIP) arthritis. We report the clinical and radiographic results of this implant with a minimum follow-up of 12 months. Thirty-three implants in 27 patients with a mean age of 67 years were reviewed. Surgical approach was mid-line dorsal and trans-tendinous. Postoperative active motion was performed with a protective splint for 4 weeks. All patients were evaluated (pain, range of motion, strength, function through QuickDASH and PRWE scores, X-rays) by an independent examiner. The mean follow-up was 21 months (range: 12-30). Pain decreased from 7.4 to 1.6 on a VAS scale (P<0.001). Flexion-extension range of motion increased from 32.1° to 59.2° (P<0.001). Functional QuickDASH and PRWE improved from 64.5 and 67.1 to 25.5 and 19.5, respectively (P<0.001). Grip and pinch strength increased from 15.1 and 1.8 to 24.2 and 2.4kg/F, respectively (P<0.001). At the last follow-up, a swan neck deformity was noticed in three patients, which was reducible in all cases. Four patients were reoperated: dorsal tenoarthrolysis in three cases and correction of swan neck deformity in one case. On X-rays, asymptomatic periprosthetic ossifications were noticed in 13 cases (39%). There were no signs of implant migration or loosening. Our results are comparable to those of other published studies of PIP arthroplasty. The modularity of the Tactys® implant allows the range of motion of the PIP joint to be maintained. It is a reliable alternative to other conventional PIP implants.

LEVEL OF EVIDENCE: Level 4, case series.