Additionally, due to the location of the scapula on the axilla, there are many lymph nodes and lymph networks in this area which assist with fluid drainage and balance within the body. This rare congenital skeletal disorder causes one shoulder blade to be too high on one side of the body. The degree of displacement of the shoulder blade can range from two to 10 centimeters. Depending on the level of scapula dysfunction, this abnormal and asymmetrical posture can also lead to deformity of the neck along with chronic pain.
This condition may be associated with other musculoskeletal defects in the body. The scapula is responsible for several motions which are integral to daily movement and smooth upper extremity motion. Protraction and retraction of the scapula assist with movement of the pectoral girdle and chest muscles both forward and back, respectively.
Elevation and depression of the scapula assist with the movement of the entire shoulder capsule up and down, seen in motions such as shrugging of the shoulders. Upward rotation and downward rotation of the scapula assist with stabilization of the shoulder capsule during excessive arm motion.
Upward rotation of the scapula occurs when the arm moves both up and outward simultaneously. This seemingly simple motion requires significant shoulder stabilization due to the intricacies of the humerus and scapula. Similar stability is required for downward rotation of the scapula when the arm moves both down and inward simultaneously. The pattern of muscle contractions and motion that occurs between the scapula and the humerus is called the scapulohumeral rhythm, which is a large focus of physical therapy for shoulder pain.
As mentioned, this is often a crucial impairment in those affected by neurological events such as a stroke due to a blockage of nerve and blood supply to this area. An additional mechanism the scapula plays a large role in is the scapulothoracic rhythm, which is the pattern of muscle contractions and motion that occurs between the scapula and the thoracic vertebra.
Similar to the scapulohumeral rhythm, this relationship is vital to the stability of the shoulder joint as a whole. Due to the strength and location of the scapula bone, fractures are rare and only occur in instances of severe or major multiple trauma.
Ligaments are vital to aid in the maintenance of scapula stability. Injury to the ligaments surrounding the scapula can occur and result in a range of symptoms depending on the severity. This can cause mild pain and loss of range of motion in simple cases or symptoms mimicking that of nerve damage, where there is no motion in the scapula due to loss of ligament function.
Shoulder impingement syndrome is partially caused by impaired scapular movements. This serves to place undue pressure on the nerves and blood supply running through the scapular muscles.
When excessive pressure is placed on nerves over an extended period of time, this can lead to a permanent loss of nerve function. Subluxation is a condition that can occur in any joint in the body. Subluxation of the shoulder joint occurs from extreme forms of ligament laxity. This can be difficult to reverse and, again, early intervention is important to minimize the complications which can result from this condition. Splints and braces are very helpful in promoting proper posture and preventing further injury.
Rest will help lessen the pressure placed on the joint, along with decreasing overall swelling and pain. Rehabilitation of injury to a shoulder ligament injury and shoulder impingement syndrome would include rest and splinting to ensure proper positioning. Proper positioning is important to give the ligament s the opportunity to return to their natural and taut form, if possible. Positioning is also beneficial to minimize the frequency of the nerve pinching and causing acute, persistent pain.
Splints, braces, or slings can be provided by medical professionals or through treatment by a physical or occupational therapist as part of a treatment course. A therapy plan of care would include light exercise, positioning, modalities for pain relief, along with light strengthening exercises once the individual is cleared by their doctor.
Subluxation typically occurs as a result of a neurological incident, such as a brain hemorrhage or a stroke.
This causes loss of nerve function to the large nerve network, called the brachial plexus, which lies over the shoulder joint. This means partial or complete loss of motor and sensory function in the impaired arm. In such instances, due to the likelihood of simultaneous cognitive impairment, a treatment method called neuromuscular re-education is a large component of physical and occupational therapy treatments.
This type of treatment guides an individual to complete basic strengthening activities and eventually functional activities such as dressing, toileting, bathing, and more using outlined methods in order to assist with reshaping the brain and building motor programs. By building new yet familiar motor programs, therapists aim to establish normal and purposeful movement. Subluxation apart from a neurological diagnosis does occur in extreme cases of ligament laxity. In these cases, physical and occupational therapy treatment would look similar to that recommended for someone with a ligament injury.
Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Shoulder dysfunction assessment: self-report and impaired scapular movements. Phys Ther. National Organization for Rare Disorders. Sprengel Deformity. Kiel J, Kaiser K. Acromioclavicular Joint Injury.
In: StatPearls. Boezaart AP, Tighe P. New trends in regional anesthesia for shoulder surgery: Avoiding devastating complications. Int J Shoulder Surg. Cowan PT, Varacallo M. The spine which is located at the back of the scapula and the acromion can be readily palpated on a patient.
The flat blade of the scapula glides along the back of the chest allowing for extended movement of the arm. The coracoid process is a thick curved structure that projects from the scapula and is the attachment point of ligaments and muscles. The scapula is also marked by a shallow, somewhat comma-shaped glenoid cavity , which articulates with the head of the humerus. The top end of the humerus consists of the head, the neck, the greater and lesser tubercles, and the shaft.
The head is half-spherical in shape and projects into the glenoid cavity. The neck lies between the head and the greater and lesser tubercles. The greater and lesser tubercles are prominent landmarks on the humerus and serve as attachment sites for the rotator cuff muscles. Note how the ball head of the humerus fits into a shallow socket on the scapula called the glenoid. One can see that this ball does not fit into the glenoid cup at all; this allows for the wide range of movement provided by the shoulder, at the cost of skeletal stability.
Joint stability is provided instead by the rotator cuff muscles , related bony processes and glenohumeral ligaments. This is an interactive guide to help you find relevant patient information for your shoulder problem. This site complies with the HONcode standard for trustworthy health information: verify here. The material on this website is designed to support, not replace, the relationship that exists between ourselves and our patients.
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