Ankle Inversion from Plantar Flexion PDF

# 1446 H/2024 A.D. ## Ankle Inversion from Plantar Flexion, ### Fig 1 Muscles in the deep layer of the posterior leg. | Tibialis Posterior | Flexor Digitorum Longus | Flexor Hallicus Longus | |:---|:---|:---| | | | | **Manual Muscle Test 200 PHT - Theoretical Part.** Jazan University, College...

# 1446 H/2024 A.D. ## Ankle Inversion from Plantar Flexion, ### Fig 1 Muscles in the deep layer of the posterior leg. | Tibialis Posterior | Flexor Digitorum Longus | Flexor Hallicus Longus | |:---|:---|:---| | | | | **Manual Muscle Test 200 PHT - Theoretical Part.** Jazan University, College of Nursing and Health Sciences, Physical Therapy Department. # 25th Lecture_Theoretical Part: Ankle Inversion from Plantar Flexion ## Objectives: At the end of this lecture the student will be able to: 1. Identify the primary muscles involved in ankle inversion from plantar flexion. 2. Identify the range of motion of ankle inversion from plantar flexion. 3. Describe effect of weakness of ankle inversion from plantar flexion. 4. Describe effect of contracture of ankle inversion from plantar flexion. ## Content: 1. Primary muscles involved in ankle inversion from plantar flexion. 2. Range of motion of ankle inversion from plantar flexion. 3. Effect of weakness of ankle inversion from plantar flexion. 4. Effect of contracture of ankle inversion from plantar flexion. ## Ankle Inversion from Plantar Flexion ### Primary Muscles: a. Tibialis posterior muscle. ### Accessory Muscles: a. Flexor digitorum longus b. Flexor hallucis longus c. Medial head of gastrocnemius. ### Range of Motion: The range of ankle inversion is of 35 degrees. ## Anatomy of tibialis posterior muscle. ### Origin: a. Upper half of posterior shaft of tibia. b. Upper half of fibula. c. Interosseous membrane (Fig.1). ### Insertion: Tuberosity of navicular bone and all tarsal bones (except talus) and spring ligament ### Action: a. Plantar flexes and inverts foot. b. Supports medial longitudinal arch of foot ### Nerve: Tibial nerve ## Figure. 1: Tibialis Posterior Muscle. ## Effects of weakness of tibialis posterior: a. Weakness of tibialis posterior decreases the ability to invert the foot and plantar flex the ankle joint. b. Weakness of tibialis posterior results in pronation of the foot. c. Weakness of tibialis posterior decreases the support of the longitudinal arch. d. Weakness of tibialis posterior interferes with the ability to rise on the toes. ## Effects of contracture of tibialis posterior: a. In non-weight bearing it results in equinovarus position of foot (Fig.2) b. In weight bearing, it results in a supinated position of the heel with forefoot varus (Fig.3). ## Figure 2: Equinovarus position of foot in non weight bearing. ## Figure 3: Supinated position of the heel with forefoot varus in weight bearing