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"upper extremity" is correct and can be used in written English.
It is generally used to refer to a person's arms and hands (or the corresponding part of an animal). For example, you could say "Our physical therapist had us do exercises to strengthen our upper extremities."
Exact(60)
You have a threatened upper extremity which also threatens employment, ability, and function.
"Surgery is frequently not an option for musicians," said Dr. Cherniack, a specialist in upper extremity medicine.
There were improvements in upper extremity spasticity and motor functions.
Upper extremity examination revealed normal circulation, motor and sensation bilaterally.
There were no paresthesias of the left upper extremity.
There were no neurovascular deficits in the right upper extremity.
86% of sonographers reported upper extremity musculoskeletal pain.
Mechanical load on the upper extremity during wheelchair activities.
Upper extremity and hand function are most limited.
There were no embolic, oculocerebral, or ischemic upper extremity events.
Associated fracture of the upper extremity was found in 10.2%.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com