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  • Title: Plantar forces mid-term after hemiarthroplasty with HemiCAP for hallux rigidus.
    Author: Jørsboe PH, Speedtsberg MB, Kallemose T, Bencke J, Penny JØ.
    Journal: Foot Ankle Surg; 2020 Jun; 26(4):432-438. PubMed ID: 31153732.
    Abstract:
    BACKGROUND: The aim of this study was to examine the biomechanical gait effects and range of motion following a proximal hemiarthroplasty with a HemiCap®. METHODS: Forty-one HemiCAP-operated participants with a mean follow-up time of 5 years had plantar force variables (PFVs) examined and compared with their non-operated foot and a control group. PFVs were compared to the MTPJ1 range of motion (ROM), and pain measured by Visual Analog Scale (VAS). RESULTS: The HemiCAP participants' operated feet had higher PFVs laterally on the foot and lower PFVs under the hallux. Dorsal ROM of the operated feet was a median 45° (range 10-75) by goniometer and 41.5 (range 16-80) by X-ray. An increase in ROM decreased the forces under the hallux. Most participants were pain-free. No correlation between pain and PFVs was found. CONCLUSIONS: Increased dorsiflexion decreased the maximum force under the hallux. A mid-term HemiCAP maintains some motion. The decreased PFVs under the hallux may reflect a patient reluctance to load the first ray, although no correlation between plantar forces and pain was found.
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