Acute and chronic tendon ruptures are of every day for an upper extremity surgeon. The repair itself is often not so difficult, but how does my patient achieve a good to excellent result? This is the real challenge in tendon surgery. Therefore, we designed a two-day course with theoretical and practical sessions offering most types of repair in different zones, chronic reconstruction possibilities and transfers for flexor and extensor tendons. The practical sessions will be performed on fresh frozen cadavers with two participants per extremity. The Tendons Esser Masterclass will be organized every 3 years.