Injury to the posterior thighs


The back muscles of the thigh are three, and in other four researchers: the biceps femur with the long and short head, the semicircular and the semicircular. These muscles, in addition to the short head, extend from the hip to the lower hip thigh, where the biceps tendon is outward, the semicircular and the semicircular inward.

With respect to the biceps femoral, it exhibits two longitudinal heads in the long, which extends along with the rest of the posterior thigh muscles from the hamstring and from the adjacent femur of the hip joint and the short head from the trabecular line and from the outer superficial line. the outer median diaphragm. Above the height of the tibia, the two heads are joined in a common occipital tendon, which rests on the forearm's head.
The long head is innervated by the tibia of the sciatic nerve and the short by the perineum.
The muscle (long head) exhibits an activated extension and helps to bend the hip joint outward. The biceps tendon rests more than the other two muscles farther from the knee motion axis and thus has greater lever strength and therefore capable of protecting the knee lock to the full extent. It is therefore a dynamic knee joint stabilizer in combination with the anterior cruciate ligament that plays the role of the static joint stabilizer. h.
On the other hand, double muscle neurosis can lead to poor synchronization or an increase in the intensity of stimulation on both heads, and this may be the main reason that this muscle exhibits the highest frequency of injuries at approximately 53%.
The semi-tendon extends from the sciatic curvature and rests with a tendon on the inner rim of the tibial curvature and on the tibial fascia, contributing to the formation of the goose foot with the hip and tail.
The semicircular protrudes from the sciatic curvature and with three bundles adjoins the anterior, the vertical and the oblique, which adheres to the articular pocket of the knee joint.
Both of these muscles are innervated by the tibia of the sciatic nerve, and activators cause stretching and help inward rotation and extension of the hip joint.


Picture: During the foot-to-ground contact phase, the flexural torque of the posterior thighs of the TMUS tries to compensate for the extensor torque of the TEXT knee

The role of the hind thighs in movement is multifactorial. For example, during the final swing phase in the running cycle these muscles are called upon to play many roles in a short period of time:

  • Eccentric contraction, slowing knee extension
  • Isometric contraction with simultaneous control of knee stability
  • They play a role in the extent of hip joint
  • They compensate for movement from knee extension to flexion

So during sports that require sudden acceleration, these muscles are quickly recruited and cause tiny molecular damage, when they are not tired and athletes in poor technique because of it, they are called upon to play yet another role, the stabilizer, as a result the extent of their charge increases dramatically. This accumulation of micro fiber bursts greatly increases their chances of injury.

Mechanics of Injury

Picture : During the swing phase the posterior thighs are activated, elongated and absorb energy from the retarded limb

The period of maximum eccentric contraction during the running cycle, during which the muscle is at both elongation and contraction, appears to present the highest risk of injury to these muscles. A low proportion of quadriceps and hindlimbs. femoral, will increase the extensor torque across the knee, and potentially extend the eccentrically retracted hind females beyond their elasticity limits.
Most epidemiological studies indicate a relatively higher one
injury rate for biceps femoris (long head) compared to the other two muscles.
Tight agonal sinusitis is primarily responsible for the anterior tilt of the pelvis, and this results in a mechanical disadvantage due to the increased muscle tension when it is in the final phase of swing.
In addition, weak abdomens bring the pelvis to the forefront, increasing their tendency and at the same time increasing the risk of injury due to overload.

Risk factors

  • Decreased elasticity - poor elasticity is definitely a risk factor for soft tissue injuries. It is believed that a tighter muscular structure may reduce the ability of the muscle to prolong rapidly without injury.
  • Poor lumbar posture and core muscle stability - excessive lower lumbar lordosis has been suggested to be a major risk factor for injury because it brings gluteal and posterior thigh muscles to mechanical disadvantage
  • Advanced age (which has been shown to be associated with inelastic hip flexors and increased body weight)
  • Excessive stride when accelerating on sprints
  • Muscle fatigue - due to it disrupts motor control
  • Inadequate warm-up - reducing muscle's ability to absorb repetitive stresses
  • The adhesions and anatomy of these muscles - double neurosis of these muscles can result in delayed contraction of these muscles, which leads to reduced power output and greater instability when they are required to deal with repeated eccentric contractions.
  • Bad ratio in quadriceps and posterior femur
  • Previous injury - Associated with poor repair
  • Maximum torque position - it is important because it can reduce the number of sarcomeres and the instability that occurs in the muscle during eccentric contraction. Therefore, training to increase the angle of extension of the knee is the point where it is produced. maximum torque on the biceps femoris will result in a reduction in the eccentric contraction during limb deceleration