Flexor hallucis longus dysfunction: an overview.

Whereas acute and chronic injuries of the tibialis posterior, peroneal and Achilles tendon are frequently encountered, disorders of the flexor hallucis longus tendon are often overlooked, which may contribute to chronic pain and disability. Patients with stenosing tenosynovitis of the flexor hallucis longus tendon frequently present with overlapping signs and symptoms of flexor hallucis longus tendinitis, plantar fasciitis and tarsal tunnel syndrome, which the authors collectively refer to as "flexor hallucis longus dysfunction." A keen awareness of the presenting signs and symptoms and use of ancillary MR imaging and FHL tenography will assist the practitioner in recognizing this commonly misdiagnosed condition.