Why AMC happens is not fully understood, although some arthrogryposis causes are known.
Others, including genetic influences, remain under study.
This article explains arthrogryposis, some potential causes for the disorder, and its symptoms.
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Is Arthrogryposis Rare?
It is an isolated congenital contracture and not arthrogryposis.
If the joints don’t move, extra connective tissue develops around the joint and fixes it in place.
There is no prenatal test for the disorder.
However, people with a history of AMC during previous pregnancies can be monitored more closely.
An AMC diagnosis is confirmed when a newborn has joint contractures in two or more places.
Arthrogryposis Treatment
Arthrogryposis cannot be cured, but treatment is directed towards specific symptoms.
For example, early vigorous physical therapy can help stretch out the contracted joints and develop the weak muscles.
Splints can also help stretch joints, especially at night.
Orthopedic surgery may also be able to relieve or correct joint problems.
Ultrasound or computed tomography (CT) scans can identify any central nervous system or other abnormalities.
These may require surgery to treat, such as congenital heart defects that may need to be repaired.
Keep in mind that AMC is not a progressive disease.
Almost two-thirds are eventually able to walk (with or without braces) and attend school.
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