Shoulder Muscles: A Case Study

Improved Essays
Chapter I The Problem and Its Scope
Introduction
The shoulder contains complicated groups of muscles, tendons, ligaments, and bursae all involved in humeral and scapular kinematics (Terry & Chopp, 2000). Regular use of the arms can result in fatigue of shoulder musculature, which could lead to altered scapular kinematics during humeral elevation (Tsai, McClure, & Karduna, 2003). These changes in scapular kinematics can potentially lead to shoulder problems such as impingement syndrome, rotator cuff tears, and glenohumeral instability (Ebaugh, McClure, & Karduna, 2006). It is important to investigate the effects of fatigue on individual shoulder muscles to further understand their role in shoulder injuries. This could help prevent future shoulder injuries
…show more content…
In particular, the infraspinatus is involved in external rotation and stabilization of the humerus as a humeral head depressor by pulling the humerus towards the glenoid fossa of the scapula (Ngomo, Mercier, & Roy, 2013). There was an increase in superior translation of the humeral head while using a nerve block to cause dysfunction of the infraspinatus and supraspinatus. This increase is also often seen in individuals experiencing shoulder impingement syndrome (San Juan, Kosek, & Karduna, 2013). Reddy, Mohr, Pink, & Jobe (2000) found that the infraspinatus showed a significant decrease in electromyographic activity during humeral elevation when comparing subjects with shoulder impingement syndrome to a control group. This suggests that the infraspinatus is an essential muscle to investigate regarding alterations in activity due to fatigue. A good amount of studies have examined infraspinatus functions and fatigue peripherally (D. Ebaugh et al., 2006; Reddy et al., 2000; Tsai et al., 2003), but none have examined the effects of fatigue on the infraspinatus

Related Documents

  • Improved Essays

    If the patient is showing signs of hematoma, loss of pulses, and pallor, a vascular injury is likely (McMillan, 2016). Any muscles in the hip region may also be stretched, torn, or otherwise damaged in a hip dislocation. Arthritis is a common long-term complication of hip dislocation due to damage of the articular cartilage. Myositis ossificans, the growth of bone tissue inside muscle tissue, can occur from soft tissue damage (Gammons,…

    • 895 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    The poor limb postures caused from ligamentous can contribute to degenerative joint conditions. There are several hypermobility or ligamentous laxity individuals who undergo chondromalacia patellae, varicose veins and uterine prolapse, excessive anterior mandibular movement, osteoarthritis disorders from nerve compression, and mitral valve…

    • 907 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    Abstract: Musculoskeletal dysfunctions such as osteoarthritis and low back pain are commonly seen among transfemoral amputees (TFAs), and are considered as secondary disabilities among amputees. The amputation surgery changes the biomechanics of transfemoral amputees abruptly. It is not unusual that the gait deviation in TFAs is commonly observed and the primary cause is muscle weakness. The amputation leads to the loss of muscle distal insertion sites and the change of muscle’s moment arm, thus the force can be generated by hip muscles is affected. These biomechanical disadvantages result in hyperlordotic posture and load increment at the intact limb.…

    • 752 Words
    • 4 Pages
    Improved Essays
  • Superior Essays

    Rotator Cuff Case Study

    • 1609 Words
    • 7 Pages

    This is where the supraspinatus tendon becomes inflamed and painful, because of the location, between the head of the humerus and the acromion of the scapula which is compressed during abduction and adduction of the shoulder. If the impingement syndrome is not treated, usually by rest and strengthening exercises as well as massage, and there is a continuation of use, this can cause the tendon(s) to tear away from the bone (AAOS, 2011). The most common tendon to tear is the supraspinatus tendon (AAOS, 2011). There are different types of tears that can occur. Sometimes the tendons begin to fray and then a single action can cause the fray to progress into a tear.…

    • 1609 Words
    • 7 Pages
    Superior Essays
  • Improved Essays

    With rheumatoid arthritis, stiffness and ache in the joints takes place. This famous autoimmune disorder additionally impacts the tissues determined concerning the body, including the center, lungs, muscle groups, blood vessels, and dermis. Osteoarthritis is related to the development of bone spurs and the discount of cartilage placed at the joint, which is as an alternative painful. When a sufferer suffers osteoarthritis, cartilage begins to break down more commonly within the joints located in the neck, knees, diminish again, hips, and…

    • 542 Words
    • 3 Pages
    Improved Essays
  • Great Essays

    When the rotator cuff muscles become chronically tight the head of the humerus will be pulled up into the shoulder socket compressing the bursa and supra spinatus tendon. As a result of the narrowing of the space between the acromion and the head of the humerus the tendons…

    • 1407 Words
    • 6 Pages
    Great Essays
  • Great Essays

    Lupus Disease

    • 1550 Words
    • 6 Pages

    Lupus, an autoimmune disease, is one of many immune disorders where our own defenses turn on us and attack our own cells and tissues. There are many forms of this disease as well and with many symptoms that can be misleading, diagnosis can be a difficult task. Symptoms can range from flu like symptoms to those that resemble arthritis, and many other diseases in between. The most common symptoms include extreme fatigue, swollen and painful joints or arthritis, fevers that are unexplained, various skin rashes and kidney problems. Lupus can affect many organ systems too, including the heart, lungs and brain.…

    • 1550 Words
    • 6 Pages
    Great Essays
  • Improved Essays

    Cortisol also aids the body’s stress response, and helps to metabolize proteins, carbs, and fats (Cushing’s Syndrome:Causes,n.d.,p1). Cushing’s Syndrome, also called hypercortisolism, may develop if cortisol levels are too high. Complications of Cushing’s Syndrome include unusual bone fractures due to osteoporosis, hypertension,…

    • 1134 Words
    • 5 Pages
    Improved Essays
  • Improved Essays

    Glucocorticoids Case Study

    • 1612 Words
    • 7 Pages

    As glucocorticoids play a vital role in the regulation of the cardiovascular, metabolic, and the immune systems (Drake, Tang & Nyirenda 2007; Manojlović-Stojanoski, Nestorović & Milošević 2012). The concept of foetal programming can arise when the foetus, the mother, or both experience abnormal conditions. These factors include malnutrition, and overexposure to stress hormone either by parental administration, or overproduction of glucocorticoids during the critical development stages. Thus resulting in a broad spectrum of irreversible damage to the development of tissues and organ systems, consequently increase the risk of developing cluster of symptoms, and impaired brain function (Manojlović-Stojanoski, Nestorović & Milošević…

    • 1612 Words
    • 7 Pages
    Improved Essays
  • Superior Essays

    The released Glutamate binds to and activates receptors in the postsynaptic nerve terminal (the dorsal horn neuron)[1]. Specifically activation of α-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA)-type and N-methyl-D-aspartate (NMDA)-type glutamate receptors lead to depolarization and the generation of action potentials which transmits the pain impulses through ascending pathways (e.g. spinothalamic tract ) to the brain. Neuropeptides like substance P are also released into the synapse and have been shown to prolong the depolarization wave elicited by Glutamate (Kandel et al, 2013). The transmission of the signal results in elevated release of norepinephrine from the locus coeruleus neurons which project to the thalamus.…

    • 1169 Words
    • 5 Pages
    Superior Essays