Final answer:
The muscles of the anterior compartment of the leg do not cross the knee joint; they are primarily involved in dorsiflexion of the foot.
Step-by-step explanation:
None of the muscles of the anterior compartment of the leg (i.e., the part below the knee) cross the knee joint. The anterior compartment includes muscles such as the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and sometimes the fibularis tertius, which are primarily responsible for dorsiflexion of the foot.
Meanwhile, muscles that do cross the knee joint, like the rectus femoris and the other components of the quadriceps femoris, are located in the anterior compartment of the thigh, not the leg.