Journal of Hand Surgery (European Volume) · IF 1.3 · July 22, 2026 · LoE III
A five-year radiostereometry study of cup fixation and implant survival in 484 Moovis trapeziometacarpal arthroplasties
Maiken Stilling, Torben Bæk Hansen, Janni Kjærgaard Thillemann — Aarhus University
This prospective single-center study followed 484 Moovis dual-mobility thumb basal joint implants in 407 patients, using precise radiostereometric analysis (RSA) to track cup migration alongside clinical and patient-reported outcomes for up to 9 years. Cup migration stabilized early (0.28 mm at 3 months, only rising to 0.39 mm by 5 years), grip strength, pain, and QuickDASH scores improved and held steady after 1 year, and 9-year implant survival was 98% for aseptic cup loosening and 87% for any component revision, with 96% patient satisfaction at 5 years.
AI summary · from the full text · reviewed by Pukhraj Gaheer, Medical Student, Queen's University before publishing
Why it mattersThis provides some of the longest-term RSA-validated fixation and survivorship data for a widely used press-fit trapeziometacarpal cup, reassuring hand surgeons about its durability compared with earlier failure-prone designs.
Conclusion strengthConfirms prior evidence
Effect exceeds the MCID on QuickDASH and blinded outcome assessment, offset by no power calculation and no comparator.
Presenting this at rounds? Start here
- ?RSA analysis was unusable in 84 hands and only 148 hands had 5-year RSA data (versus 484 implanted); how might this substantial and selective loss of migration data, combined with the wide range of actual follow-up times (2-9 years), bias the reported migration and survival estimates?
- ?Given that all 13 intraoperative trapezium fractures occurred in the first 20% of cases (suggesting a learning curve), what specific technical safeguards should surgeons adopting this implant put in place during their early experience to avoid this complication?