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A Retrospective Data Collection of Distal Interphalangeal Joint Fusion with X Fuse® Superelastic Implant
Clare McCarthy, MD1, Rebecca Stone McGaver, MS, ATC2, Claire R Joubert, PAC1 and Kayla J Seiffert, BA1, (1)Twin Cities Orthopedics, Edina, MN, (2)Twin Cities Orthopedices, Edina, MN

Purpose:
Arthrodesis of the distal interphalangeal (DIP) joint of the fingers and interphalangeal (IP) joint of the thumb are common procedures for multiple diagnoses. The purpose of this study was to evaluate fusion rates and complications in patients who have been previously implanted with the X Fuse® Superelastic Implant.
Methods:
All patients who had a DIP and/or thumb IP joint fusion between June 2013 and May 2019 by the senior author were included. Chart review was used to note demographics, hand dominance, body mass index, and medical and surgical history, including complications, comorbidities, clinical recovery, absence of pain, and functional use. Pre- and post-operative radiographs were evaluated for angular deformity, post-operative correction of that deformity, boney consolidation, and tine cut-out.
Results:
Fifty-three (53) patients (60 fingers, 43 females, 10 males) with a mean age of 62.6 years were included. Surgical diagnoses included osteoarthritis (45), rheumatoid arthritis (4), psoriatic arthritis (1), swan/mallet fingers (5), ulnar motor loss instability (2), and trauma/fracture (3). The implant angulation of 0° X Fuse® was used 85% of the time while the 15° X Fuse® was used in nine cases. Bone consolidation was observed in all but one patient at the average time of 9.7 weeks (range 4.1-17.6 weeks).
Conclusions:
The X Fuse® Superelastic Implant avoids the complications of prominent hardware in the distal tuft as well as painful interosseous wires irritating soft tissue and necessitating a second surgery for removal. The device offers different sizes and different angles to meet the patient's needs. In conclusion, the X Fuse® Superelastic Implant is a safe and reliable implant for intra-medullary implantation in small bones to achieve fusion in a desired angle with minimal complications and 98% fusion rate.

Level of Evidence: IV- Case Series


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