Injuries of the Extensor Tendons

The extensor system is composed of an extrinsic system and an intrinsic system that work in synergy during the digital extension. It is extra-synovial, except at the level of the extensor retinaculum where it is surrounded by a synovial sheath allowing its lubrication and nutrition. The most frequent injuries are subcutaneous ruptures in zones 1, 2 or 3, which are treated with orthotic, or open traumas that are treated with surgery.