Symptoms of an isolated tear of the flexor retinaculum include pain, numbness, and tingling on the arch of the foot that’s provoked by walking, standing, and running. Due to the high number of proprioceptive nerve receptors in the fibrous band ankle instability can occur due to the altered feedback to the brain from the retinacula. This generally occurs in those that repeatably experience ankle sprains for no apparent reason.
If the flexor retinaculum extra-articular fibers start to lack proper tissue hydration, lacks mobility, and increases friction on the flexor tendons and tibial nerve. When this occurs compression of the tibial nerve and artery occurs, which is known as tarsal tunnel syndrome.