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MatOrtho Proximal Interphalangeal Joint Arthroplasy: Minimum Two-Year Follow-up
Olivia Flannery, MD; Oliver Harley, MD; Ann Birch, MD; Mike Hayton, MD; Ian A. Trail, MD
Wrightington Upper Limb Unit, Appley Bridge, United Kingdom

Introduction: The MatOrtho proximal interphalangeal replacement (PIPR) is a cementless cobalt-chromium metal-on-polyethylene mobile bearing surface replacement arthroplasty. It permits preservation of the collateral ligament attachments so that joint stability is not compromised. The aim of this study is to report the outcome and complications from the MatOrtho PIPR at a minimum of 2 years of follow-up from a single centre.

Materials and Methods: A retrospective case review was performed on all MatOrtho PIP joint replacements performed with a minimum of 2-year follow-up. Patient demographics, diagnosis, implant revision and other surgeries were recorded. Subjective and objective outcomes were evaluated at latest follow-up including pain scores, range of motion and radiographic assessment.

Results: 109 implants were inserted in 56 patients. Nine implants (6 patients) were lost to follow-up. Of the remaining 100 implants 75 were female, the average age at time of surgery was 64 years and the principal diagnosis was osteoarthritis in 77% of joints. The average follow-up was 46 months. The revision rate was 12%. The reasons for revision were soft tissue failure in 6 patients, stiffness in 5 patients and implant failure in 1 patient. Eight joints were revised to the NeuFlex (silicone rubber) prosthesis, 3 were converted to an arthrodesis and 1 had exchange of the MatOrtho prosthesis. Twenty-four joints (24%) required soft tissue release. There was no infection. There was a significant improvement in pain scores, with 62 out of 72 joints being pain free at rest. There was an improvement in functional scores post operatively but no improvement in range of motion. Nine percent showed some radiological periprosthetic lucency but no clinical loosening was observed.

Conclusion: The survival of the MatOrtho PIP joint arthroplasty was 88% at a minimum of 2 years follow-up. Patients can be advised that the procedure achieves good pain relief, improvement in functional scores but does not improve range of motion.

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