[Tendinopathies of the foot and ankle : Evidence for the origin, diagnostics and therapy].

Tendinopathies of the foot and ankle result in substantial impairment of the mobility of patients and have a high clinical significance. Knowledge of the origin of these diseases has been accumulated over decades from the multitude of intrinsic and extrinsic triggering factors based on biomechanical considerations with an evidence-based medicine (EBM) level 5. A high correlation between tendinopathy and hypervascularization of the Achilles tendon was found in a double-blind randomized prospective study using Doppler ultrasound (EBM level 1) but these results were not reproducible; therefore, the importance of these findings is unclear. Inspection and clinical examination supplemented by ultrasound and magnetic resonance imaging (MRI) are essential to achieve the correct diagnosis. The varying extent of load-dependent irritation of tendons and the surrounding tissues and the individual variation in experience of investigators mean that the results of clinical examinations are difficult to collate or not reproducible and cannot be investigated in studies. The expression of the varying results is difficult to assess even by the use of sonography and magnetic resonance imaging (MRI). Conservative treatment of tendinopathy is based on medical experience (EBM level 5). The effectiveness of physiotherapeutic eccentric loading and extracorporal shock wave treatment (ESWT) for Achilles tendinopathy was demonstrated in several case control studies and series (EBM level 3). Due to the high rate of healing with physiotherapy, surgery should only be performed following a minimum of 6-12 weeks of unsuccessful conservative treatment, because formation of scar tissue on the foot can result in permanent complaints (EBM level 4).