Posterior tibial tendon dysfunction (PTTD) is a progressive and debilitating condition. Flat foot is a known associated factor of PTTD but there are still many questions about the biomechanical etiology of PTTD. Hypermobility in the first ray and first metatarsophalangeal joint (MPJ) is thought to be a causative factor in various foot pathologies including PTTD, however the association is not well established. This study aimed to (i) investigate whether hypermobility was associated with development of PTTD in flat footed persons and (ii) report a novel technique of quantifying the stiffness of foot joints. …
