This is a study to assess the benefit of sodium hyaluronate (Ostenil) injection for plantaris friction syndrome (PFS) associated with midportion Achilles tendinopathy. Functional outcome scores will be recorded prior to treatment and at regular intervals up to 2 years. Changes in tendon structure will be assessed using ultrasonographic tissue characterisation (UTC). UTC will be performed prior to treatment and also at regular intervals up to 6 months following injection.
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Ultrasound Tissue Characterisation (UTC)
Timeframe: up to 6 months post intervention