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Categories: Abstracts, 2017, Podium

Silastic 1st metatarsal phalangeal joint replacement for the treatment of end stage hallux rigidus: analysis of a consecutive series of 108

J. Ring, T. Clough

¹Wrightington, Wigan and Leigh NHS Hospital Trust, Lancashire, United Kingdom

Introduction: Arthroplasty for treatment of end stage hallux rigidus is controversial. Arthrodesis remains the gold-standard, but this procedure is not without complications, with up to 10% non-union, 14% re-operation and 10% transfer metatarsalgia rates reported.
The aim of this study was to analyse the outcome of the double-stemmed silastic implant (Wright-Medical) for end stage hallux rigidus.

Method: We conducted a retrospective review of a consecutive series of 108 silastic 1^st MTPJ implanted in our Unit (January 2005 - December 2016). Data was collected from our research databases, patient notes, PACS and PROMS. No patient was lost to follow-up.

Results: Average age was 60.1 years (range 42-84 years; 104F; 4M). Results show a 98.1% survivorship at an average 5.1 years follow up (range 6 months-12 years). Average pre- and post-operative MOXFQ scores were 78.8/100 and 11.0/100 respectively and VAS scores improved from 7/10 to 1.3/10, with an average post-operative range of movement of 26.3°. Overall satisfaction rate was 90.6%. 2 patients (1.9%) required revision; 1 for early infection (2 months) and 1 for stem breakage (10 years). There were 15 complications (13.9%) in the group, 5 lateral metatarsalgia, 7 patients stiffness and ongoing pain in the index joint occurred in 2.7%. There was a 20% incidence of radiological cyst formation or demarcation, but this was neither progressive, symptomatic, nor affected clinical outcome.

Conclusions: The authors believe these results are superior to results of other published implants for hallux rigidus (BioPro and Cartiva). Additionally, these results do not confirm progressive osteolysis, previously reported for this implant in other series, as being a mechanism of failure. Finally, these results suggest the double stemmed silastic 1^st MTPJ replacement provides a reliable alternative, with at least comparable outcomes, to that of fusion, for the treatment of end stage hallux rigidus.

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Tags: Hallux Rigidus

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