Optimal arthrokinematic motion of the shoulder joint generally follow "convex (humerus) on concave (scapula) rules," that is, glide occurs opposite to roll when the humerus is moving on a relatively fixed scapula. For example, during abduction of the shoulder, the humeral head rolls superiorly and glides inferiorly.
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Thereof, how does the scapula move during shoulder flexion?
Shoulder movements The scapula moves around a dorso-ventral axis, resulting in a rotation in the frontal plane. The scapula on the thorax contributes to elevation (flexion and abduction) of the humerus by upwardly rotating the glenoid fossa 50° to 60° from its resting position.
Similarly, what are the 9 movements of the shoulder?
- Flexion and Extension. Flexion and extension are movements that take place within the sagittal plane and involve anterior or posterior movements of the body or limbs.
- Abduction and Adduction.
- Circumduction.
- Rotation.
- Supination and Pronation.
- Dorsiflexion and Plantar Flexion.
- Inversion and Eversion.
- Protraction and Retraction.
Likewise, people ask, what is Arthrokinematic motion?
'Arthrokinematics' refers to the movement of joint surfaces. The angular movement of bones in the human body occurs as a result of a combination of rolls, spins, and slides. A slide is a translatory movement, sliding of one joint surface over another.
What muscles perform shoulder flexion?
The muscles involved in the flexion movement include the anterior deltoid, pectoralis major and coracobrachialis. For a shoulder extension, your body uses the latissimus dorsi, teres major and minor and posterior deltoid muscles.
Related Question AnswersWhat is upward rotation of the scapula?
Results. The middle and lower serratus anterior muscles produce scapular upward rotation, posterior tilting, and external rotation. Upper trapezius produces clavicular elevation and retraction. The lower trapezius assists in medial stabilization and upward rotation of the scapula.How does the scapular movement work?
Upward rotation of the scapula on the thorax is the primary motion of the scapula observed during active elevation of the arm and plays a significant role in increasing the range of elevation of the arm overhead. This motion places the glenoid fossa in a position to support and stabilize the head of the raised humerus.Why is scapular upward rotation important?
Upward rotation of the scapula is suggested to be clinically important because the scapula must rotate adequately in an upward fashion to prevent the humeral head from compressing and shearing against the undersurface of the acromion process during humeral elevation.Which muscle is the prime mover for shoulder flexion?
pectoralis majorWhat muscles retract the scapula?
Retraction of the scapula is sometimes called adduction of the scapula. The scapula is moved posteriorly and medially along the chest wall. Muscles: rhomboideus major, minor, and trapezius are the prime movers. The muscles that protract and retract the scapula are antagonistic, that is, they have opposed actions.What is scapular depression?
2. Depression of the Shoulder Girdle - A movement opposite to elevation. The scapula moves downward or in an inferior direction. Shrugging the shoulder illustrates elevation and depression of the shoulder girdles. The normal ranges of motion of these movements are 40° of elevation and 10° depression.What does Osteokinematics mean?
osteokinematics. (ŏs″tē-ō-kĭn″ĕ-măt′ĭks) The branch of biomechanics concerned with the description of bone movement when a bone swings through a range of motion around the axis in a joint, such as with flexion, extension, abduction, adduction, or rotation.What is the difference between Osteokinematic and Arthrokinematic movements?
So in general Osteokinematics means bone movement and Arthrokinematics joint movement. Osteokinematics is the gross movement that happens between two bones.What is Jointplay?
There are three movements within a joint: active, passive, and joint play. According to Dr. John Mennell's research, joint play occurs within the paraphysiological space within a joint. It is the summation of movements of joint play and movement in the voluntary range that make up the movement of the living anatomy."What is the concave convex rule?
The “concave on convex” rule Instead of moving the ball, move and roll your palm around the stationary ball. As your palm rolls around the ball, it also glides in the same direction. So, when a concave joint surface is moving on a convex joint surface, roll and glide occur in the SAME direction.What is open packed position?
Open pack means the joint is all loosey-goosey, that the ligaments holding the joint together are not taut. The joint is considered rather unstable in the open pack position. Closed-pack position is the opposite. The ligaments surrounding the joint are pulled taut.Which way is convex?
The most important thing to remember is that concave means curving inwards and convex means curving outwards. As convex – bent outwards – is the opposite of concave, it should be easy to remember.Which structures provide most of the stability for the shoulder joint?
The glenoid labrum is a rim of gristle (fibrocartilage) attached to the periphery of the glenoid cavity and acts to deepen the socket and increase the contact surface area between the ball and socket, increasing the stability of the shoulder joint.What causes limited range of motion in shoulder?
One of the most common causes of frozen shoulder is the immobility that may result during recovery from a shoulder injury, broken arm or a stroke. If you've had an injury that makes it difficult to move your shoulder, talk to your doctor about exercises you can do to maintain the range of motion in your shoulder joint.What is shoulder adduction?
Adduction is the movement of a body part toward the body's midline. So, if a person has their arms straight out at the shoulders and brings them down to their sides, it is adduction. For fingers or toes, adduction brings the digits toward the center of the hand or foot.What are the 12 body movements?
- Flexion and Extension. Flexion and extension are movements that take place within the sagittal plane and involve anterior or posterior movements of the body or limbs.
- Abduction and Adduction.
- Circumduction.
- Rotation.
- Supination and Pronation.
- Dorsiflexion and Plantar Flexion.
- Inversion and Eversion.
- Protraction and Retraction.
