Logan Steele
The tibia is one of two bones that make up the leg, and it is the weight-bearing bone, making it larger and stronger than the fibula. The tibia is the site of attachment for many leg muscles, including the sartorius, gracilis, quadriceps femoris, semimembranosus, semitendinosus, and popliteus muscles. The tibialis anterior is one of four muscles in the anterior compartment of the leg, and it arises from the upper 2/3 of the lateral surface of the tibia. The tibialis anterior tendon (TAT) can have varying insertion patterns, and a deep portion of the muscle can insert more proximally into the talus.
| Characteristics | Values |
|---|---|
| Muscle | Tibialis anterior |
| Tibia section | Upper 2/3 of the lateral surface |
| Innervation | Deep fibular nerve, recurrent genicular nerve (L4) |
| Function | Dorsiflexion and inversion of the foot |
| Other functions | Stabilizes the ankle, locks the ankle, maintains the medial longitudinal arch of the foot |
| Related pathologies | Tibialis anterior hernia, Tibial tuberosity fractures, Osgood-Schlatter disease |
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What You'll Learn
Tibialis anterior muscle
The tibialis anterior muscle is the largest of four muscles in the anterior compartment of the leg. It is a fusiform muscle, meaning it is thick and fleshy above and tendinous below. The muscle is easily palpable lateral to the anterior border of the tibia. It is innervated by the deep fibular nerve, a branch of the common fibular nerve, and the recurrent genicular nerve (L4). The body of the muscle is supplied by the branches of the anterior tibial artery. The anterior tibial artery passes from the posterior popliteal fossa to the anterior leg through an opening in the interosseous membrane between the tibia and fibula.
The tibialis anterior muscle arises from the upper two-thirds of the lateral surface of the tibia and the adjoining part of the interosseous membrane and deep fascia overlying it, and the intermuscular septum between this muscle and the extensor digitorum longus. The tendon of the tibialis anterior usually passes beneath the extensor retinaculum, which holds it in place. The tibialis anterior tendon (TAT) begins at the distal one-third of the tibia and inserts distally on the medial border of the foot.
The tibialis anterior is one of the primary inverters of the foot. As the muscle arises from the lateral tibia and the tendon inserts on the medial border of the foot, muscle contraction lifts structures of the medial arch (medial cuneiform, first metatarsal, navicular, talus) into adduction-supination or inversion. The movement of inversion occurs at two synovial joints in the foot: the subtalar joint, between the talus and calcaneus, and the midtarsal joint, between the talus and navicular bone.
The tibialis anterior muscle helps maintain the medial longitudinal arch of the foot. It aids in any activity that requires moving the leg or keeping the leg vertical. It functions to stabilise the ankle as the foot hits the ground during the contact phase of walking (eccentric contraction) and acts later to pull the foot clear of the ground during the swing phase (concentric contraction). It also functions to 'lock' the ankle, as in toe-kicking a ball, when held in an isometric contraction.
Excessive physical activity, especially among runners and military personnel, can result in repetitive microtrauma of the tibialis anterior, causing pain along the anterior edge of the tibia known as anterior shin splints or anterior tibial stress syndrome. A tibialis anterior hernia is a rare type of hernia in which fat or other material protrudes through a defect in the tibialis anterior muscle.
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Tibialis anterior hernia
The tibia is one of two bones that comprise the leg, with the other being the fibula. The tibia is the weight-bearing bone of the two, and it runs medial to the fibula from just below the knee joint to the ankle joint. The tibia is connected to the fibula by the interosseous membrane. The tibialis anterior muscle arises from the upper two-thirds of the lateral surface of the tibia and is inserted into the medial and inferior surface of the medial cuneiform bone. The tibialis anterior muscle is the largest of four muscles in the anterior compartment of the leg. It is responsible for dorsiflexion and inversion of the foot.
A tibialis anterior hernia is a rare type of hernia in which fat or other materials protrude through a defect in the tibialis anterior muscle. This type of hernia is typically caused by trauma, such as an inadvertent kick to the lower leg during a football match. It can also be caused by excessive strain on the legs, which is common in athletes and dancers. The tibialis anterior muscle is the most common site of muscle herniation, with around 200 cases reported in the literature.
The treatment of tibialis anterior hernias is controversial, and surgery is typically only considered for symptomatic patients. Conservative management of this condition includes load modifications, compression stockings, and exercises targeting the ankle range of motion, particularly in dorsiflexion. In some cases, custom-made orthotics may be prescribed to alleviate the tensile load and contraction of the tibialis anterior during heel strike.
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Tibial tuberosity
The tibia is one of two bones that comprise the leg, the other being the fibula. The tibia is the weight-bearing bone of the two, and it is significantly larger and stronger than the fibula. The tibia runs medially to the fibula from just below the knee joint to the ankle joint.
The tibial tuberosity is a large, broad protrusion located on the anterior surface of the proximal tibia. It is a bony protrusion where the patellar ligament inserts. The tibial tuberosity can be easily palpated as the protrusion located just inferior to the patella. The subcutaneous infrapatellar bursa overlies the tibial tuberosity.
The tibial tuberosity provides the inferior insertion for the patellar ligament, also known as the common quadriceps tendon. The quadriceps femoris inserts anteriorly on the tibial tuberosity. The tibial tuberosity serves as the origin or insertion point for many muscles, including the tibialis anterior, extensor digitorum longus, soleus, tibialis posterior, flexor digitorum longus, sartorius, gracilis, quadriceps femoris, semimembranosus, semitendinosus, and popliteus muscles.
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Tibialis posterior tendon
The tibia is one of two bones that comprise the leg, the other being the fibula. The tibia is the weight-bearing bone, making it significantly larger and stronger than the fibula. The tibia forms the knee joint proximally with the femur and forms the ankle joint distally with the fibula and talus.
The tibialis posterior is located deep in the posterior compartment of the lower leg and is situated between the flexor digitorum longus and the flexor hallucis longus. It is a key stabilising muscle supporting the medial arch of the foot. The tibialis posterior tendon (also called the posterior tibial tendon) connects the lower leg muscles to the bones on the inner side of the foot and ankle.
The tibialis posterior tendon is susceptible to inflammation (tendonitis), which can be temporary (acute) or long-lasting (chronic). Acute tendonitis can heal with time and rest, but if it becomes chronic, it can lead to a cycle of tissue degeneration, eventually resulting in posterior tibial tendon dysfunction (PTTD). PTTD is the failure of the posterior tibial tendon, which can lead to the collapse of the arch of the foot (commonly known as flatfoot). This condition can cause debilitating deformities and affect mobility.
The tibialis posterior tendon can be strengthened through various exercises, which can help prevent or treat conditions associated with weakness in this tendon. Strengthening exercises can be performed in multiple positions, including functional positions, to isolate the tibialis posterior muscle. Plantarflexion with inversion movement is encouraged to achieve this.
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Tibialis anterior tendon
The tibia is one of two bones that make up the leg, with the other being the fibula. The tibia is the weight-bearing bone of the two, making it significantly larger and stronger than the fibula. The tibia runs medial to the fibula from just below the knee joint to the ankle joint.
The tibialis anterior is a muscle in the anterior compartment of the leg. It is the largest of four muscles in this compartment, with the other three being the extensor digitorum longus, extensor hallucis longus, and fibularis tertius. The tibialis anterior tendon (TAT) is a tendon that is part of the tibialis anterior muscle. The TAT begins at the distal one-third of the tibia and inserts distally on the medial border of the foot.
The tibialis anterior muscle is primarily responsible for dorsiflexion and inversion of the foot. The muscle helps maintain the medial longitudinal arch of the foot. It draws up and holds the toe in a locked position. The tibialis anterior aids in any activity that requires moving the leg or keeping the leg vertical. It functions to stabilize the ankle as the foot hits the ground during the contact phase of walking (eccentric contraction) and acts later to pull the foot clear of the ground during the swing phase (concentric contraction). It also functions to 'lock' the ankle, as in toe-kicking a ball, when held in an isometric contraction.
The TAT can be affected by anterior tibialis tendonitis, an injury that occurs in the front of the ankle where the tendon meets the foot. Tendonitis in the TAT can cause pain and affect the ability to dorsiflex and invert the foot. Treatment options for anterior tibialis tendonitis include anti-inflammatory medicines, such as ibuprofen or naproxen, and cold therapy.
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Frequently asked questions
The tibia is the site of attachment for many leg muscles. Muscles that insert into the tibia include the sartorius, gracilis, quadriceps femoris, semimembranosus, semitendinosus, and popliteus muscles.
The tibia is one of two bones that comprise the leg. As the weight-bearing bone, it is larger and stronger than its counterpart, the fibula. The tibia forms the knee joint with the femur and the ankle joint with the fibula and talus.
The tibialis anterior is a muscle that arises from the upper 2/3 of the lateral surface of the tibia. It is inserted into the medial and inferior surface of the medial cuneiform bone and adjacent portion of the first metatarsal bone. The tibialis anterior is responsible for dorsiflexion and inversion of the foot.
Tibial tuberosity is a bony protrusion of the anterior tibia where the patellar ligament inserts.
