Humerus trochlea aplasia is a rare congenital disorder characterized by the absence of the trochlea, a small, curved bone in the elbow joint. This condition can cause the elbow joint to be unstable and can lead to limited range of motion and pain. Treatment typically involves physical therapy and bracing to help stabilize the joint and improve range of motion. In some cases, surgery may be necessary to reconstruct the joint.

The symptoms of humerus trochlea aplasia include:

-Limited range of motion in the shoulder joint
-Pain in the shoulder joint
-Weakness in the shoulder muscles
-Decreased strength in the arm
-Decreased ability to lift the arm
-Decreased ability to rotate the arm
-Decreased ability to reach overhead
-Decreased ability to reach behind the back
-Decreased ability to reach across the body
-Decreased ability to reach forward
-Decreased ability to reach up
-Decreased ability to reach down
-Decreased ability to reach out to the side
-Decreased ability to perform activities of daily living

Humerus trochlea aplasia is a rare congenital condition that is caused by a genetic mutation. It is believed to be caused by a mutation in the HOXD13 gene, which is responsible for the development of the humerus and the trochlea. Other potential causes include environmental factors, such as exposure to certain toxins or radiation, or a chromosomal abnormality.

1. Surgery: Surgery is the most common treatment for humerus trochlea aplasia. The goal of surgery is to reconstruct the trochlea and restore normal shoulder function. This may involve using a graft from another part of the body, such as the fibula, to create a new trochlea.

2. Physical Therapy: Physical therapy is an important part of treatment for humerus trochlea aplasia. Physical therapy can help to improve range of motion, strength, and coordination in the affected shoulder.

3. Bracing: Bracing may be used to help support the shoulder and reduce pain.

4. Medication: Nonsteroidal anti-inflammatory drugs (NSAIDs) may be prescribed to reduce pain and inflammation.

1. Genetic predisposition: Humerus trochlea aplasia is a congenital condition, meaning it is present at birth and is caused by a genetic mutation.

2. Family history: A family history of Humerus trochlea aplasia increases the risk of the condition.

3. Maternal age: Women over the age of 35 are more likely to have a baby with Humerus trochlea aplasia.

4. Maternal health: Women with certain medical conditions, such as diabetes, are more likely to have a baby with Humerus trochlea aplasia.

5. Environmental factors: Exposure to certain environmental toxins, such as radiation, may increase the risk of Humerus trochlea aplasia.

At this time, there is no known cure or medications for humerus trochlea aplasia. Treatment typically involves physical therapy and/or surgery to correct the deformity and improve function.