Abstract
Category:
Midfoot/Forefoot
Introduction/Purpose:
Advanced-stage arthritis of the first metatarsophalangeal joint (MTPJ), or “Hallux Rigidus” (HR) is a common forefoot pathology. When surgery is indicated, arthroplasty is an alternative to arthrodesis, which aims to preserve MTPJ dorsiflexion. Since it is unclear whether total-toe or hemi-toe devices are preferred implants in MTPJ arthroplasty, we completed a systematic review of the literature and did a meta analysis to test which type of implants clinically outperform in hallux rigidus.
Methods:
A systematic review of MTPJ arthroplasty was performed using Pubmed, EMBASE, SCOPUS, and Cochrane library for the years 2000 to 2017. Data was extracted from articles containing both preoperative and postoperative endpoints for either hemi or total MTPJ arthroplasty cases. To be eligible for inclusion, studies must have had a mean follow-up window of at least 24 months and standard deviation of outcome. Total eleven studies were included for review, seven studies with hemi replacement and six studies with total arthroplasty. Pooled mean values were calculated, and a forest plot was created comparing pre-and post-operative American Orthopedic Foot and Ankle Score (AOFAS), visual analogue scale (VAS), and range of motion (ROM) results for both hemi-toe and total-toe arthroplasty. Statistical analysis was performed using SPSS.
Results:
Mean postoperative AOFAS scores in patients undergoing hemiarthroplasty improved by 50.7 points (95%CI: 48.5, 52.8), which was higher than the mean postoperative AOFAS improvement of 40.6 points (95%CI: 38.5, 42.8) seen in total-toe patients. Mean postoperative VAS improvement in hemiarthroplasty was 6.05 points (95%CI: 5.92, 6.18), which was comparable to the mean VAS improvement of 6.29 points (95%CI: 6.02, 6.55) seen in total arthroplasty. Mean postoperative MTPJ ROM improved by 43.0 degrees (95%CI: 39.3, 46.6) in hemi-toe patients, which exceeded the mean ROM improvement of 32.5 degrees (95%CI: 29.9, 35.1) found in total-toe cases. A meta-analysis of the data revealed non-significant statistical trends for AOFAS and ROM in favor of hemiarthroplasty.
Conclusion:
Hemi-surface implants in MTPJ arthroplasty may improve postoperative AOFAS and ROM results to a greater extent than total-toe devices. High-quality randomized controlled studies are needed to confirm long-term surgical outcomes in these patients.