Evaluation of Collagen-based Medical Device Treatment Combined With Physiotherapy in Subjects With Achilles Tendinopathy.

In view of the morpho-structural changes that characterize Achilles tendinopathy, the use of injectable medical devices such as Collagen Medical Devices might find therapeutic indication. For some years now, in fact, the use of injectable medical devices based on porcine collagen and ancillary substances of natural origin (Collagen Medical Devices GUNA) has been introduced in the treatment of painful and degenerative pathologies of the locomotor system, which allow a more effective and specific placement of collagen in situ with the function of vehiculation and stabilization. The purpose of this research project is to understand through a multicenter, randomized clinical study investigation the impact of treatment with a porcine Collagen-based Medical Device called MD-Tissue, administered in the peri-tendon area, in combination with physiotherapy on pain reduction and functional improvement of the investigated tendon. The multicenter, randomized clinical investigation is prospective, and will have a total duration of 8 weeks. After enrollment, subjects will be randomized and assigned to two experimental groups: * Group A which, alongside physiotherapy (eccentric strengthening protocol) will receive MD-Tissue Collagen Medical Device. * Group B which, will implement only physiotherapy (eccentric strengthening protocol). Variables will be assessed at baseline (T0 time), after 1 week (T1), after 2 weeks (T2), after 3 weeks (T3), at the end of the injection treatment, and 6 weeks after enrollment (T6/FU). A further evaluation will be carried out after 2 weeks and after 8 weeks T8/FU from the start of the investigation study. After enrollment, subjects in both groups will begin a physiotherapy course (eccentric strengthening protocol), lasting 6 weeks. Each session will consist of stretching exercises of the Achilles tendon.