Abstract
Category: Ankle; Basic Sciences/Biologics Introduction/Purpose: The purpose of this systematic review was to evaluate the clinical outcomes, complication rates and failure rates at short-term follow-up following hyaluronic acid (HA) injection for the management of various soft tissue foot and ankle pathologies. Methods: During January 2023, the PubMed, Embase and Cochrane library databases were systematically reviewed to identify clinical studies examining outcomes following HA injection for the management of various soft tissue foot and ankle pathologies. Data regarding study characteristics, patient demographics, pathological characteristics, subjective clinical outcomes, radiological outcomes, complications and failure rates were extracted and analysed. In addition, the level of evidence and quality of evidence for each individual study was also assessed. Results: Studies examining outcomes following HA injection included the following pathologies: Achilles tendinopathy (AT) (6 studies, 126 patients, weighted mean follow-up of 2.9 months), plantar fasciitis (PF) (2 studies, 54 patients, 4.3), lateral ankle sprains (LAS) (2 studies, 119 patients, follow-up of 11.4 months) and Morton's neuroma (MN) (1 study, 83 patients, follow-up of 12 months). Seven different HA formulations were utilised across 10 studies. Weighted mean pain and functional scores improved significantly in all 4 cohorts. The complication rates for the AT cohort, PF cohort, LAS cohort and MN include: 3.2%, 1.9%, 2.5% and 20.5%, respectively. The failure rates for the AT cohort, PF cohort, LAS cohort and MN include: 1.6%, 0%, 0% and 0%, respectively. Conclusion: This systematic review demonstrated improvements in subjective clinical outcomes together with low complication and failure rates following HA injections for various soft tissue foot and ankle pathologies at short term follow-up. However, the heterogeneity between the studies, low number of high quality studies and short-term follow-up limits the generation of any robust conclusions. Further research is warranted to assess the optimal role of HA in the management of foot and ankle soft tissue pathologies.
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