Dominic Stone
Abduction is an anatomical term for the movement of a limb away from the midline of the body. Arm abduction, for example, is the movement of the arms away from the body within the plane of the torso. The primary muscles involved in arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior. Hip abduction, on the other hand, involves the gluteus medius, gluteus minimus, and tensor fasciae latae (TFL) muscles. These muscles help to stabilize the pelvis and rotate the leg at the hip joint.
| Characteristics | Values |
|---|---|
| Definition | Abduction is an anatomical term of motion referring to a movement that draws a limb out to the side, away from the median sagittal plane of the body. |
| Arm Abduction Muscles | Supraspinatus, Deltoid, Trapezius, Serratus Anterior |
| Hip Abduction Muscles | Sartorius, Gluteus Maximus, Gluteus Medius, Gluteus Minimus, Tensor Fasciae Latae, Piriformis |
| Hip Abduction Exercises | Lying Side Leg Lifts, Clamshells, Banded Side Steps, Squats, Standing Hip Abductions, Side-Lying Hip Abduction |
| Hip Abduction Benefits | Improved Stability, Injury Prevention, Improved Athletic Performance, Improved Range of Motion, Pain Relief |
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What You'll Learn
Hip abductor muscles
The hip abductor muscles are crucial for balance and athletic activity, contributing to our ability to stand, walk, and rotate our legs. These muscles are often overlooked, but they are essential for maintaining stability when walking or standing on one leg. Located on the lateral thigh, the primary hip abductor muscles include the gluteus medius, gluteus minimus, and tensor fasciae latae (TFL). The gluteus medius is the prime mover of abduction at the hip joint and is the largest of the three gluteal muscles. It is located on the lateral aspect of the upper buttock, below the iliac crest, and has a fan-like shape. The gluteus minimus is the smallest of the three gluteal muscles and works in tandem with the gluteus medius to abduct and internally rotate the thigh, contributing to hip and pelvis stability.
The secondary hip abductors include the piriformis, sartorius, and superior fibres of the gluteus maximus. The sartorius muscle is the longest muscle in the human body, running over the hip and knee joints. It weakly abducts and laterally rotates the thigh. The gluteus maximus is the largest and heaviest muscle in the body and is the most superficial of all the gluteal muscles, located at the posterior aspect of the hip joint.
Weakness in the hip abductor muscles can lead to pain and improper movement, particularly in the knees and hips. This can result in conditions such as patellofemoral pain syndrome (PFPS), iliotibial (IT) band syndrome, and trochanteric bursitis. Strengthening the hip abductors through exercises like lying side leg lifts, clamshells, and banded side steps or squats can help prevent and treat these issues.
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Arm abductor muscles
Arm abduction is the anatomical term for the movement of the arms away from the body within the plane of the torso (coronal plane). This movement begins with the arm in a position parallel to the torso and the hand in an inferior position. The arm is then moved to a position perpendicular to the torso, ending with the arm raised above the shoulder joint and pointing straight upward. The full range of motion for arm abduction can be observed during a jumping jack.
The primary muscles involved in arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior. The supraspinatus muscle originates from the supraspinous fossa of the scapula, passes under the acromion, and inserts on the superior facet of the greater tubercle of the humerus. It is responsible for the initiation of arm abduction by stabilising the humeral head in the glenoid fossa and controlling the motion up to the first 15 degrees of abduction.
Past 15 degrees, the supraspinatus assists the deltoid with arm abduction up to 90 degrees. The deltoid is a triangular-shaped muscle found over the glenohumeral joint, composed of three different heads: anterior, lateral, and posterior. The deltoid is the primary muscle responsible for arm abduction from 15 to 90 degrees and also serves as a stabiliser of the humeral head, especially when carrying loads.
The trapezius is a large, superficial muscle of the back that divides into three functional parts: descending (superior), middle, and ascending (inferior). The serratus anterior is another muscle involved in arm abduction, receiving its blood supply from the circumflex scapular artery.
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Shoulder abduction
Abduction is an anatomical term referring to the movement of a limb away from the midline of the body. Arm abduction is the movement of the arms away from the body within the plane of the torso (coronal plane). The primary muscles involved in arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.
The supraspinatus muscle originates from the supraspinous fossa of the scapula, passes under the acromion, and inserts on the superior facet of the greater tubercle of the humerus. It is responsible for the initiation of arm abduction by stabilizing the humeral head in the glenoid fossa and controlling movement up to the first 15 degrees of abduction. Beyond 15 degrees, the supraspinatus assists the deltoid with arm abduction up to 90 degrees. The deltoid is a triangular-shaped muscle found over the glenohumeral joint, composed of three heads: anterior, lateral, and posterior. The supraspinatus contributes to shoulder joint stability by resisting gravitational forces and maintaining contact between the head of the humerus and the glenoid fossa.
The middle fibres of the deltoid are responsible for arm abduction from 15 to 90 degrees. The deltoid receives its neural supply from the axillary nerve (C5, C6) of the posterior cord of the brachial plexus. The subacromial/subdeltoid bursa is a structure that lies between the deltoid muscle and the joint capsule in the superolateral aspect of the joint. It reduces friction underneath the deltoid muscle, allowing increased mobility.
Scapular rotation due to the actions of the trapezius and serratus anterior muscles allows for abduction beyond 90 degrees. The trapezius receives its neural supply from the spinal accessory nerve (C1-C5), with C3 and C4 responsible for proprioception. The circumflex scapular artery provides vascular supply to the serratus anterior.
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Hip abduction exercises
There are two main positions for hip abduction exercises: standing and lying on your side. Here are some specific exercises for each position:
Standing Hip Abduction
Stand with your back straight and feet facing forward, maintaining good posture. Move your right leg out to the right side until you feel a strain along the outer side of your hip and leg. Bring your leg back down to the starting position. Repeat this for 12 to 15 repetitions and then do the same with your left leg. Ensure that you don't lean too far in any direction while performing this exercise. You can also use tubing for resistance. Loop one side of the tubing around one ankle and step on the long end of the tubing with the ball of your other foot. The closer you step to the looped side, the greater the resistance.
Side-Lying Hip Abduction
Lie on your left side with your legs stacked on top of each other and your toes pointed forward. You can cushion your head on your bent left arm. Move your right leg out to the right side until you feel a strain and then bring it back down. Repeat this for 10 reps and then switch to the other leg, working up to 3 sets. As you progress, aim for 20 reps on each side. You can also place a band around your thighs to increase resistance.
Clamshell Exercise
This exercise is performed while lying on your side. Stack your hips and knees, bending them so that your hips are flexed forward about 45 degrees. Keep your body in a long, neutral position, ensuring that your head, pelvis, and feet are aligned. Engage your core and rotate your top knee up and open, using your hip. Hold this position for 2 to 3 seconds and then return to the starting position. Repeat this movement 10 times on each side, working your way up to 20 reps.
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Hip abductor weakness
Weakness in the hip abductor muscles can cause insufficient pelvic stabilisation during locomotion, which can lead to problems in the kinetic chain. This altered biomechanics can cause stress on the outer hip soft tissues, leading to pain and injury. It can also increase medial femoral rotation and valgus knee moments, resulting in an increased Q-angle, altered tracking of the patella, and subsequent injury and pain. Additionally, hip abductor weakness can cause the arch of the foot to drop, leading to flat feet or foot hyperpronation. This condition is known to contribute to issues like shin splints.
The treatment for hip abductor dysfunction is primarily hip-focused physical therapy, which helps to stretch and strengthen the muscles of the back, core, and hip. Therapy typically lasts for at least six to eight weeks, depending on the severity of the muscle dysfunction. For patients who have undergone total hip replacement, physiotherapy-directed hip abductor strength training has been shown to improve gait speed and cadence.
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Frequently asked questions
Abduction is the anatomical term for the movement of a limb away from the midline of the body.
The primary muscles involved in arm abduction are the supraspinatus, deltoid, trapezius, and serratus anterior.
The muscles involved in hip abduction include the gluteus maximus, gluteus medius, gluteus minimus, tensor fasciae latae, and sartorius.
Hip abduction exercises can help improve stability, prevent injuries, and reduce pain in the hips and knees. They can also improve athletic performance, particularly in sprinting and running.
Hip abduction exercises can be done in different positions, such as standing or lying on your side. Resistance bands or bodyweight can be used to provide additional resistance.
