The iliotibial tract or iliotibial band (also known as the band Maissiat or IT Band) is the longitudinal fibrous strengthening of the lascal fascia. The actions of ITB and the associated muscles are to prolong, kidnap, and laterally rotate the hip. In addition, ITB contributes to lateral knee stabilization. As long as the knee extension of ITB moves anteriorly to the lateral condyle of the femur, while ~ 30 degrees of flexion of the knee, ITB moves posteriorly to the lateral condyle. However, it has been suggested that this is only an illusion because of the strain changes in the anterior and posterior fibers during movement. This is derived from the anterolateral iliac tubercle portion of the iliac crystal external lip and the insertion of the lateral condyle of the tibia in Gerdy tubercle. The image shows only the proximal portion of the iliotibial canal.
Part of the iliotibial band located below the tensor fasciae latae is extended upward to join the lateral portion of the hip joint capsule. The tensor fasciae latae effectively tightens the iliotibial band around the knee area. This makes it possible to strengthen the knee especially in lifting the opposite leg.
Gluteus maximus and tensor fasciae latae muscles inserted in the channel.
Video Iliotibial tract
Clinical interests
The IT band stabilizes the knee both in extension and in partial flexion, and is therefore used constantly during walking and running. When one leans forward with a slightly bent knee, the tract is the knee's main support for gravity.
Iliotibial band syndrome (ITBS or ITBFS, for iliotibial band friction syndrome) is a thigh injury commonly associated with running. This can also be caused by biking or hiking. The incidence of iliotibial band syndrome occurs most often in cases of excessive use. The iliotibial band itself becomes inflamed in response to repeated compression on the outside of the knee or swelling of the fat pad between the bone and the tendon at the knee side. ITB syndrome can also be caused by poor physical condition, lack of warm up before exercise, or drastic changes in activity levels. Until recent anatomical studies show differently, the previously held belief is that the distal portion of the iliotibial band rubs over the bursa, but the bursa is found to be absent. Moreover, the theory that iliotibial bands need to be stretch has been questioned as, in cadaveric study under extreme loads, the flexibility of iliotibial bands has been shown to be minimal with greater stiffness than capsular fibers.
Symptoms of iliotibial band syndrome may include pain in the outside of the knee at the beginning of the exercise that goes through a particular exercise or movement such as running down and bending the knee for a long time.
This syndrome is usually developed by people who suddenly increase their activity level, such as runners who increase their mileage. Other risk factors for ITBS include gait abnormalities such as overpronation, leg length differences, or bent legs. ITB Syndrome is an overuse condition of distal ITB near the lateral femoral condyle and in Gerdy tubercle. The most vulnerable knee range for this condition is 30-40 degrees; This is where ITB crosses the lateral femoral epicondyle.
Maps Iliotibial tract
Postural function
The IT band is very important to stand asymmetric (pelvic slouch). The upward push on the lower attachment of the IT ribbon thrusts the knee back into hyperextension, thus locking the knee and turning the limb into a rigid supportive pillar.
References
This article combines text in the public domain of page 468 of the 20th edition of Gray's Anatomy (1918)
Source of the article : Wikipedia
0 Comments