“…Yet, the literature on their benefits is somewhat equivocal. Many studies have an observational or non-randomised design [28], while other studies compare custom orthotics with sham or generic insoles [29][30][31], which may carry their own therapeutic properties, potentially diluting the observed benefits of the customised versions. To date, however, the most compelling evidence of orthotic interventions includes the effect on specific diagnoses such as plantar fasciitis [32], and Achilles tendinopathy with moderate-to-low certainty of short-term pain reductions [33].…”