Navicular Tuberosity

Tuberosity fractures are relatively common.  The main tendon that stabilizes the arch, the posterior tibial tendon, inserts into the navicular tuberosity.  It exerts force on the tuberosity when the foot is forcibly everted, or outwards.  The fractures are generally nondisplaced due to multiple ligament attachments.  Treatment includes the use of a short leg cast with a well-molded arch for 6-8 weeks.  Often the foot is held in plantarflexion and inversion to decrease the pull of the PT tendon.  When displaced, early surgical reattachment is recommended.