Shoulder pain out of the blue

A patient presents with a sudden-onset sharp and burning pain down the side of her upper arm

Emma, a 32-year-old, right-handed accountant presented with severe right shoulder pain.

The pain developed over a 24-hour period and there was no history of prior injury.

She does not play any regular sports and had not used the shoulder for any physical activities prior to the onset of the pain. She does not have diabetes.

The pain was localised to the lateral aspect of her upper arm, and was sharp and burning in nature.

Clinical examination showed a very irritable shoulder generally.

Her range of motion was