Displacement of the head of the humerus out of the shoulder joint. The main symptom is pain in the shoulder and upper arm, made worse by movement. A forward dislocation often produces obvious deformity; a backward dislocation usually does not.
Diagnosis is by X-rays. The head of the humerus is repositioned in the joint socket. The shoulder is then immobilized in a sling for about 3 weeks.
Complications of shoulder dislocation include damage to nerves, causing temporary weakness and numbness in the shoulder; damage to an artery in the upper arm, causing pain and discoloration of the arm and hand; and damage to muscles that support the shoulder.
A painful condition of the shoulder accompanied by sti?ness and considerable limitation of movement. The usual age-incidence is between 50 and 70. The cause is in?ammation and contracture of the ligaments and muscles of the shoulder joint, probably due to overuse. Treatment is physiotherapy and local steroid infections. There is practically always complete recovery, even though this may take 12–18 months.... frozen shoulder
Displacement of the crystalline lens from its normal position in the eye. Lens dislocation is almost always caused by an injury that ruptures the fibres connecting the lens to the ciliary body. In Marfan’s syndrome, these fibres are particularly weak and lens dislocation is common.A dislocated lens may produce severe visual distortion or double vision, and sometimes causes a form of glaucoma if drainage of fluid from the front of the eye is affected. If glaucoma is severe, the lens may need to be removed. (See also aphakia.)... lens dislocation
Pain and stiffness affecting one shoulder and the hand on the same side; the hand may also become hot, sweaty, and swollen. Arm muscles may waste through lack of use (see Sudeck’s atrophy). The cause of shoulder–hand syndrome is unknown, but it may occur as a complication of myocardial infarction, stroke, herpes zoster, or shoulder injury. Recovery usually occurs in about 2 years. This period may be shortened by physiotherapy and corticosteroid drugs. In rare cases, a cervical sympathectomy is performed.... shoulder–hand syndrome
(luxation) n. displacement from their normal position of bones meeting at a joint such that there is complete loss of contact of the joint surfaces. It usually results from trauma (e.g. dislocation of the shoulder, which is common in sports injuries, and dislocation of the mandible from the temporomandibular joint) but may be congenital, in which case it usually affects the hip (see congenital dislocation of the hip). In a traumatic dislocation the bones are restored to their normal positions by manipulation under local or general anaesthesia (see reduction). Compare subluxation.... dislocation
(CDH) an abnormality present at birth in which the head of the femur is displaced or easily displaceable from the acetabulum (socket) of the ilium, which is poorly developed; it frequently affects both hip joints. CDH occurs in about 1.5 per 1000 live births, being more common in first-born girls, in breech deliveries, and if there is a family history of the condition. The leg is shortened and has a reduced range of movement, and the skin creases may be asymmetrical. All babies are routinely screened for CDH at birth and at developmental check-ups by gentle manipulation of the hip causing it to be reduced and dislocated with a clunk (see Barlow manoeuvre; Ortolani manoeuvre). The diagnosis is confirmed by X-ray or ultrasound scan. Treatment is with a special harness holding the hip in the correct position. If this is unsuccessful, the hip is reduced under anaesthetic and held with a plaster of Paris cast or the defect is corrected by surgery. Successful treatment of an infant can give a normal hip; if the dislocation is not detected, the hip does not develop normally and osteoarthritis develops at a young age.... congenital dislocation of the hip
a difficult birth (see dystocia) in which the anterior or, less commonly, the posterior fetal shoulder impacts on the maternal symphysis or sacral promontory. It is an obstetric emergency and is diagnosed when the shoulders fail to deliver after the fetal head and when gentle downward traction has failed. Additional obstetric manoeuvres (e.g. *McRobert’s manoeuvre) are required to release the shoulders from below the pubic symphysis. It occurs in approximately 1% of vaginal births. There are well-recognized risk factors, such as maternal diabetes and obesity and fetal *macrosomia. There can be a high *perinatal mortality rate and morbidity associated with the condition; the most common fetal injuries are to the brachial plexus, causing an *Erb’s palsy or *Klumpke’s paralysis. Maternal morbidity is also increased, particularly *postpartum haemorrhage.... shoulder dystocia
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