Athena Vale
Hip extension is a fundamental movement involved in many daily activities, such as walking, standing up, and climbing stairs. It also plays a crucial role in various sports, including running, jumping, and kicking. The hip extensors are a group of muscles that work together to facilitate hip extension, and their strength is essential for maintaining proper gait and posture. The primary hip extensors include the gluteus maximus, the hamstring muscles (including the long head of the biceps femoris, semimembranosus, and semitendinosus), and the adductor magnus. These muscles collaborate to extend the hip joint, with the gluteus maximus being the most powerful contributor. Weak hip extensors can lead to gait abnormalities and reduced athletic performance. Understanding the role of these muscles and incorporating specific exercises into workout routines can help strengthen the hip extensors and improve overall functional movement.
| Characteristics | Values |
|---|---|
| Definition | Hip extension occurs when the hip joint is extended or "opened" so that the angle between the pelvis and thigh increases |
| Muscles Involved | Gluteus maximus, ischiocondylar part of adductor magnus, semimembranosus, semitendinosus, biceps femoris, iliopsoas, rectus femoris, sartorius, hamstring muscles, abdominal muscles |
| Functions | Hip extension is involved in daily movements such as walking, standing up from a chair, and climbing stairs. It is also important for sports activities like running, jumping, and kicking. |
| Exercises | Standing kickbacks, wall-assisted leg extensions, box/bench-assisted hip lifts, glute squeezes |
| Benefits of Exercises | Strengthening hip extensors can improve performance in sports that require their use, such as sprint racing, running, and cycling |
| Impairments | Paralysis of hip extensors can lead to hyper-extension achieved by dorsiflexing the ankle, extending the knee, and hyper-extending the lumbar spine |
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What You'll Learn
Psoas major
The psoas major is a long, thick, fusiform muscle located in the lumbar region of the trunk, lateral to the lumbar vertebrae, and medial to the quadratus lumborum muscle. It is one of the inner muscles of the hip group and is often considered alongside the iliacus muscle. The name 'psoas' comes from the Greek word for 'muscle of the loin'.
The psoas major muscle functions as both a static and dynamic muscle. It sits at a juncture between the upper and lower body and acts as a "front to back" muscle due to its origin and insertion points. The muscle has two segments, one on each side of the body, which assist with unilateral and bilateral motions. The psoas major combines with the iliacus muscle to act as a hip flexor in both supine and standing positions.
The psoas major is innervated by branches of the lumbar plexus, specifically the anterior branches of spinal nerves L1-L3, and L1-L4. The muscle receives its blood supply mainly from the iliolumbar branch of the internal iliac artery and drains into the femoral, external iliac, and internal iliac veins, as well as directly into the inferior vena cava.
The psoas major muscle contributes to the floor of the femoral triangle in the thigh. Its tendon, known as the iliopsoas tendon, lies deep within the thigh. The psoas major acts as a hip flexor, hip adductor, and hip external rotator. It helps to stabilise the lumbar spine and the femoral head within the acetabulum of the hip during movement.
Sitting for excessive periods can shorten the psoas muscle, leading to myofascial pain, low back pain, and difficulty maintaining a standing position. Psoas major release and stretching can assist in alleviating pelvic pain.
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Iliacus
The iliacus muscle is a flat, triangular sheet that connects the ilium bone to the lesser trochanter. It fills the iliac fossa, the curved surface of the largest pelvic bone. The iliacus is one of the inner hip muscles and is part of the iliopsoas muscle group, along with the psoas major, psoas minor, obturator externus, obturator internus, superior gemellus, inferior gemellus, piriformis, and quadratus femoris muscles.
The iliopsoas is the body's most important hip flexor, and the iliacus is one of the key muscles that helps to maintain proper body posture. The iliacus muscle works in synergy with the psoas major muscle to produce movements in the hip joint. When its proximal attachment is fixed, the muscle contributes to the flexion of the thigh. On the other hand, with its distal attachment fixed, the muscle helps to bring the trunk forward against resistance. These actions are essential for lower limb functions such as walking, running, and jumping.
The iliacus muscle is innervated by the femoral nerve (L2-L4) and is mainly supplied by the iliolumbar artery. Additionally, it receives blood from the deep circumflex iliac, obturator, and femoral arteries. The anterior surface of the pelvic part of the iliacus muscle is covered with the iliac fascia, which separates it from the peritoneum. This surface of the iliacus is also crossed by the lateral femoral cutaneous nerve, the cecum on the right side, and the iliac part of the descending colon on the left side. The medial margin of the iliacus muscle is in relation to the femoral nerve and lateral margin of the psoas major muscle.
The iliacus muscle can become shortened due to excessive use, especially in individuals with sedentary lifestyles or those who engage in excessive exercise without adequate stretching. This shortening can lead to trigger points, tight areas, or knots in the muscle that are painful, tender, and stiff. It can also contribute to an anterior tilt of the pelvis and cause hip, knee, and lower back problems if left untreated.
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Rectus femoris
The rectus femoris is one of the four muscles that make up the quadriceps femoris, or simply, quadriceps. The other three muscles are the vastus intermedius, the vastus lateralis, and the vastus medialis. The rectus femoris is the only quadricep muscle that traverses both the hip and the knee joint. It is a powerful hip flexor, but its influence depends on the position of the knee and hip. When the knee is flexed, the rectus femoris is at its most powerful; when the knee is extended, it loses much of its power.
The rectus femoris is situated in the middle of the front of the thigh and is fusiform in shape. Its superficial fibres are arranged in a bipenniform manner, with deep fibres running straight down to the deep aponeurosis. The muscle has two origins. The "direct head" originates from the anterior inferior iliac spine, while the superior acetabular ridge is the origin of the "indirect head". The direct head is more often involved than the indirect head.
The rectus femoris is a direct antagonist to the hamstrings at the hip and the knee. It is prone to injury as it crosses both the knee and the hip. A rectus femoris strain, also referred to as a hip flexor strain, is a common injury at the tendon that attaches to the patella, or in the muscle itself. The injury is usually a partial tear but can be a full tear. The rectus femoris is also susceptible to avulsion fractures, where a forceful contraction of the muscle generates a force greater than that which holds the bone together, causing a fragment of the anterior inferior iliac spine of the hip to avulse.
The muscle is innervated by the femoral nerve, originating from lumbar nerve roots L2 to L4. The femoral nerve is the posterior division of the L4 root.
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Sartorius
The sartorius muscle is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. The sartorius muscle originates from the anterior superior iliac spine and part of the notch between the anterior superior iliac spine and anterior inferior iliac spine. It runs obliquely across the upper and anterior part of the thigh in an inferomedial direction. It passes behind the medial condyle of the femur to end in a tendon. This tendon curves anteriorly to join the tendons of the gracilis and semitendinosus muscles in the pes anserinus, where it inserts into the superomedial surface of the tibia. Its upper portion forms the lateral border of the femoral triangle, and the point where it crosses adductor longus marks the apex of the triangle.
The sartorius muscle can move the hip joint and the knee joint, but all of its actions are weak, making it a synergist muscle. At the hip, it can flex, weakly abduct, and laterally rotate the femur. At the knee, it can flex the leg; when the knee is flexed, the sartorius medially rotates the leg. Sitting cross-legged demonstrates all four actions of the sartorius. The muscle may be split into two parts, and one part may be inserted into the fascia lata, the femur, the ligament of the patella, or the tendon of the semitendinosus. The tendon of insertion may end in the fascia lata, the capsule of the knee joint, or the fascia of the leg. The muscle may be absent in some people.
The name 'sartorius' comes from the Latin word 'sartor', meaning tailor, and it is sometimes called the tailor's muscle. This name likely refers to the cross-legged position in which tailors once sat. The muscle may also have been named for its resemblance to a tailor's ribbon, or for the inferior portion of the muscle being the 'inseam' or area of the inner thigh that tailors commonly measure when fitting trousers. Antique sewing machines required continuous crossbody pedalling, which would have given tailors particularly developed sartorius muscles.
The sartorius muscle plays an important part in stabilising the pelvis, especially in women. This is due to the constrictive effect that the muscles on both sides of the body have on the pubic symphysis. One of the many conditions that can disrupt the use of the sartorius is pes anserine bursitis, an inflammatory condition of the medial portion of the knee. This condition usually occurs in athletes from overuse and is characterised by pain, swelling, and tenderness.
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Pectineus
The pectineus muscle is a flat, quadrangular muscle found in the superomedial part of the anterior thigh. It is the most anterior adductor of the hip. The muscle's primary action is hip flexion; it also assists in hip adduction and external rotation of the hip. The pectineus muscle originates from the pectineal line of the pubis and the surface of the bone in front of it, between the iliopectineal eminence and pubic tubercle. The fibres pass downward, backward, and lateral, to be inserted into the pectineal line of the femur, which leads from the lesser trochanter to the linea aspera.
The pectineus muscle is considered a transitional muscle between the anterior thigh and medial thigh due to its innervation by the femoral nerve and, in some cases, the obturator nerve. The femoral nerve is the greater nerve, providing the sole innervation for the pectineus muscle in over 90% of cases. The muscle is also innervated by the accessory obturator nerve in 8.7% of cases. The pectineus muscle can become injured by overstretching, specifically by stretching a leg or legs too far out to the side or front of the body. The most common symptom of an injured pectineus muscle is pain.
The pectineus muscle is also a postural muscle as it stabilises the pelvis and balances the trunk on the lower extremity during walking. It is one of the five key muscles that contribute to hip flexion, along with the iliacus, psoas, rectus femoris, and sartorius. Activities that use this muscle include running, skating, kicking a soccer ball, and playing basketball.
The pectineus muscle can be classified in the medial compartment of the thigh when emphasising its function or the anterior compartment of the thigh when emphasising its nerve. The muscle is related to the psoas major muscle and the medial circumflex femoral artery and vein by its external border. Its internal border is connected to the outer edge of the adductor longus. The obturator foramen is situated directly behind the pectineus muscle, forming one of its coverings.
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Frequently asked questions
Hip extensors are muscles that produce the greatest torque across the hip, allowing for movements such as walking, standing up from a chair, climbing stairs, running, jumping, and kicking.
The muscles that extend the hip include the gluteus maximus, the hamstring muscles (including the long head of the biceps femoris, semimembranosus, and semitendinosus), and the adductor magnus.
Hip extension exercises can help strengthen the hip extensor muscles. Some examples of these exercises include standing kickbacks, where you lift your leg and extend it backwards, and glute bridges, where you lift your hips towards the ceiling while engaging your core and glutes.
