Differentials
Trigger finger
SIGNS / SYMPTOMS
INVESTIGATIONS
SIGNS / SYMPTOMS
The finger can be fully extended with a notable click.
INVESTIGATIONS
Ultrasound: thickening and hypoechogenicity, with possible increased vascularity of the A1 pulley.
Epithelioid sarcoma
SIGNS / SYMPTOMS
INVESTIGATIONS
SIGNS / SYMPTOMS
Tends to be progressive and extend beyond localised digits.
INVESTIGATIONS
Biopsy: results can be difficult to determine but are often seen as well-defined eosinophilic cytoplasms and one or more atypical, eccentrically located nuclei, resulting in a plasmacytoid appearance.
Camptodactyly
SIGNS / SYMPTOMS
INVESTIGATIONS
SIGNS / SYMPTOMS
Presence of little finger contracture from an early age.
INVESTIGATIONS
No differentiating tests.
Traumatic finger contracture
SIGNS / SYMPTOMS
INVESTIGATIONS
SIGNS / SYMPTOMS
History of significant preceding trauma leading to injury of the proximal interphalangeal joint.
INVESTIGATIONS
X-ray of hand may show associated fracture.
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