On the Anatomy of the Extensor Mechanism and Why Co- Contraction Is Necessary for Versatile Static Fingertip Forces

The so-called multi-articular musculotendons couple torque production across joints because they cross several degrees-offreedom (DOFs) of a limb. There is much debate on whether the function and control differs for monoand bi-articular musculotendons [4]. To expand this dialogue, I highlight some biomechanical aspects of multi-articular finger musclotendons. I conclude it is useful to consider these aspects before drawing conclusions about the neural selection of coordination patterns.