tibialis posterior muscle


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tib·i·al·is pos·ter·i·or mu·scle

(tib-ē-ā'lis pos-tēr'ē-ŏr mŭs'ĕl)
Most anterior (deepest) muscle of deep posterior (plantar flexor) compartment of leg; origin, soleal line and posterior surface of tibia, the head and shaft of the fibula between the medial crest and interosseous border, and the posterior surface of interosseous membrane; insertion, navicular, three cuneiform, cuboid, and second, third, and fourth metatarsal bones; action, plantar flexion and inversion of foot; nerve supply, tibial.
Synonym(s): musculus tibialis posterior [TA] .

tibialis posterior muscle

Leg muscle. Origin: anterior tibia and fibula. Insertion: navicular, cuneiform, and cuboid bones; metatarsals 2-4. Nerve: tibial (L4-L5). Action: inverts and plantarflexes foot.
See also: muscle

tibialis posterior muscle

; PTM lower-leg posterior-compartment muscle (see compromise of tibialis posterior PTM (function)
  • origin lower one-third of tibia, fibula and interposed interosseous

  • insertion primarily into navicular tuberosity, with distal slips passing to deep plantar structures (plantar aspects of cuneiforms, and 2, 3 and 4 metatarsal bases)

  • nerve supply tibial nerve

  • action ankle joint plantar flexion and subtalar joint inversion, locking talonavicular and calcaneocuboid joints; major dynamic hindfoot stabilizer, resisting valgus (pronatory) deformity

References in periodicals archive ?
Weakness or pain during contraction of an injured tibialis posterior muscle is characteristic.
6,13) Therefore, dysfunction of the tibialis posterior muscle results in less efficient gait, as the heel does not effectively medialize, and the gastrocsoleus complex requires greater excursion to become a heel inverter.
30,32-34) It is postulated that the surgical failures in patients with deep posterior compartment syndrome may be due to inadequate release of the tibialis posterior muscle or suboptimal postoperative mobilization that leads to hematoma and scar formation in the deep posterior compartment.