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Feb 25 - ankle and lower leg.doc

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Physical Education and Sport
Brad Kern

Feb 25 – Ankle and Lower Leg • Subtalar joint allows inversion and eversion • Subtalar joint is made up of the talus and calcaneus • Ankle joint (allows plantar flexion and dorsi-flexion) • The lateral collateral ligament is made up of 3 ligaments: the posterior talofibular ligament, calcaneofibular ligament, anterior talofibular ligament. These all stop inversion • The medial aspect of the ankle is relatively stable due to the deltoid ligament • The medial aspect is also stable due to the bony structure • The fibula extends down the lateral side, so this adds to the stability of the medial side of the ankle • Eversion ankle sprains are rare • There are mostly lateral ankle sprains due to inversion of the calcaneous • The tibia doesn’t extend as far down as the fibula • Posterior talofibular ligament runs on the posterior side of the ankle • Know table 15.1 on page 237 Muscles to know Anterior – ankle dorsiflexion  extensor digitorum longus, extensor halluscis longus, tibialis anterior Superficial posterior – ankle plantar flexion  soleus, gastrocnemius. Plantaris, Gastroc is a 2 joint muscle, it crosses the knee and is involved in plantar flexion. The soleus, gastroc, and plantaris all make up the Achilles tendon Deep Posterior – involved in ankle inversion.  tib posterior, flexor digitorum longus, flexor hallucis longus Lateral compartment – ankle eversion  peroneals Preventing Injury In the Lower Leg and Ankle Achilles Tendon Stretching • Tight heel cord may limit dorsiflexion • Should routinely stretch before and after practice • Normal dorsiflexion should be 10 degrees • Performed with knee extended and flexed 15-30 degrees. Different degrees of stretching will stretch the soleus. If the knee is straight, the gastroc will be
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