Where is the iliotibial tract located?
The structure is located on the lateral surface of the thigh, representing a thickening of the fascia lata (fascia lata). The lateral intermuscular septum of the thigh (septum intermusculare femoris laterale), which separates the anterior and posterior muscle compartments, is anchored to it. The tract descends inferiorly and attaches to the tibia.
What is its structure and what is it formed from?
The tract is formed by the following anatomical components:
- Muscle aponeuroses — formed by the fusion of the fascia lata with the gluteus maximus muscle (m. gluteus maximus) and the tensor fasciae latae (m. tensor fasciae latae).
- Superior fibers of the gluteus maximus — the anterosuperior fibers of this muscle transition into a broad tendon that sweeps around the greater trochanter and continues into the tract.
- Origin — originates from the iliac crest (crista iliaca) and the aponeuroses of the aforementioned muscles.
- Insertion — attaches anterior to the lateral condyle of the tibia in the area of Gerdy's tubercle (Gerdy’s tubercle).
What function does this structure perform?
The primary role of the iliotibial tract is the stabilization of the knee joint in the sagittal plane. It serves as a passive stabilizer during locomotion (walking and running). Additionally, along with vastus lateralis, the tract creates a lateral pull, participating in the biomechanics of the knee joint.
What is the clinical significance of the tractus iliotibialis?
This anatomical structure is involved in a number of clinical and surgical aspects:
- Symptoms and pathologies — contracture of the m. tensor fasciae latae impairs knee joint stabilization. Iliotibial band syndrome (TFL/IT-band syndrome) is also recognized, manifesting as lateral knee pain due to friction of the tract against the lateral condyle.
- Surgical application — an aponeurotic strip from the iliotibial tract (harvested from the middle third of the thigh, measuring 8–10 cm in length and 2–3 cm in width) is used as a grafting material in surgeries, such as Thiersch–Pyrah plastic surgery for anal sphincter tightening.
The tract is formed with the participation of m. gluteus maximus and m. tensor fasciae latae and participates in the stabilization of the knee joint.
Class and exam questions
Where does the iliotibial tract attach?
It attaches anterior to the lateral condyle of the tibia in the area of Gerdy's tubercle (Gerdy’s tubercle).
Which muscles participate in the formation of the tractus iliotibialis?
The tract is formed by the fusion of the fascia lata with the gluteus maximus muscle (m. gluteus maximus) and the tensor fasciae latae (m. tensor fasciae latae).
What is the main function of the iliotibial tract?
The main function consists in the passive stabilization of the knee joint in the sagittal plane during walking and running.
What else to study on this topic
- Fascia lata of the thigh (fascia lata)
- Tensor fasciae latae (m. tensor fasciae latae)
- Gluteus maximus muscle (m. gluteus maximus)
- Lateral intermuscular septum of the thigh
- Stabilization of the patella and knee joint
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