To fit the extension to the patient’s upper limb, you can take the measurements of arm and forearm.

The arm length should be measured:

• from the greater tubercle of the humerus
• to the lateral epicondyle of the humerus

The forearm length should be measured:

• from the lateral epicondyle of the humerus
• to the styloid process of the ulna

Set the obtained lengths in a 1:1 ratio on the centimeter rulers for the arm and forearm parts of the shoulder therapy extension before placing the patient’s limb on it.