I'm trying to know how can I investigate about the muscle functions in these three object?
Shoulder laxity refers to the amount of movement that occurs within the joint, which can be greater than normal due to a stretched or relaxed ligament. This condition can increase the risk of injury and instability.
Shoulder hypermobility refers to an excessive range of motion in the shoulder joint that can cause instability and increased risk of injury. It is often seen in individuals with joint hypermobility syndrome, which is a genetic condition characterized by hypermobile joints.
Shoulder instability refers to a problem with the stability of the shoulder joint, which can cause the joint to slip out of place or become dislocated. This can result from a traumatic injury, such as a fall, or from repeated microtrauma to the joint.
To investigate muscle functions in these conditions, you can use various imaging techniques, such as X-rays, MRI scans, and CT scans, as well as physical examination and assessment of the range of motion, strength, and stability of the joint. Other tests that may be used include electromyography and nerve conduction studies to assess muscle function, and tests to evaluate the stability of the joint, such as the apprehension test.
Laxity generates the hypermobility syndrome.
You can check this studies:
Article Epidemiology of Generalized Joint Laxity (Hypermobility) in ...
https://journals.lww.com/jaaos/Abstract/2011/08000/Impact_of_Joint_Laxity_and_Hypermobility_on_the.2.aspx
The first two, laxity and hypermobility, are not pathological.
Instability, on the other hand, is pathological, and can have the causes listed by Geir Bjorklund.
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