The Infinity Total Ankle System: Early Clinical Results With 2- to 4-Year Follow-up

Foot Ankle Spec. 2019 Apr;12(2):159-166. doi: 10.1177/1938640018777601. Epub 2018 Jun 4.


Aims: This study presents the first report of clinical and radiographic outcomes of the Infinity Total Ankle System (Wright Medical, Memphis, TN) with minimum 2-year follow-up.

Patients and methods: The first 67 consecutive patients who underwent primary total ankle arthroplasty (TAA) with the Infinity system at 2 North American sites between August 2013 and May 2015 were reviewed in a prospective, observational study. Demographic, radiographic, and functional outcome data were collected preoperatively, at 6 to 12 months postoperatively, and annually thereafter.

Results: The overall implant survival rate was 97% (65 of 67 implants) at a mean follow-up of 35.4 months (27 to 47 months). Two cases underwent talar component revision for aseptic loosening. Six of the 67 cases (9%) required a nonrevision reoperation. Mean Foot Function Index and Ankle Osteoarthritis Scale scores at latest follow-up improved from preoperative by 21.6 ( P < .0001) and 34.0 ( P < .0001), respectively. No radiographic loosening of any talar or tibial components was identified in the 65 nonrevised cases.

Conclusion: Early clinical and radiographic outcomes with the Infinity TAA are promising and compare favorably to those reported for both fixed- and mobile-bearing third-generation TAA designs, even when used in cases with deformity and increased case complexity.

Levels of evidence: Level IV.

Keywords: arthritis and joint disease; complex foot and ankle conditions; implant arthroplasty; implants; joint replacement.

Publication types

  • Observational Study

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Ankle Joint / diagnostic imaging
  • Ankle Joint / surgery*
  • Arthroplasty, Replacement, Ankle / methods*
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Middle Aged
  • Osteoarthritis / diagnostic imaging
  • Osteoarthritis / surgery*
  • Prospective Studies
  • Prosthesis Design
  • Prosthesis Failure
  • Radiography
  • Time Factors
  • Treatment Outcome