Sound waves may reveal future of hand disease

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Voluntary written informed consent of the participant or their legally authorized representative has been obtained prior to any screening procedures 2. Clinical diagnosis of DD and a Tubiana staging not exceeding stage II, TPED does not exceed 90°; this is chosen because to great of a contracture will pose problems with taking the US measurement. 3. In the clinical assessment the subject has rather soft DD nodules, more firm nodules are more fibrotic and are less likely to contain blood vessels. This will be confirmed by a hand surgeon at the screening phase. 4. Participant has self reported rapid progression. In the anamnesis the subject reports one of the following: The DD lesion has changed in degree of contracture/nodule size recently; the patient is worried about the function of the involved fingers/hand due to recent progression; the patient is new to DD or has just started experiencing greater discomfort due to a previous existing nodule. 5. Participant agrees to not undergo any form of surgical treatment for DD during the duration of their participation, being 6 months. 6. Participant agrees to return to the clinic after 6 months voluntarily for follow-up measurements. Exclusion Criteria: 1. Participant has any other disorder or pathology of the hand/fingers that could affect the quality of US measurements. This list is exhaustive: trigger finger, fracture, hematoma, tenosynovitis, tendon ruptures, scleroderma, fibromatosis, inflammatory conditions, rheumatoid arthritis, osteoarthritis. 2. Participant has received prior treatment for Dupuytren's disease (needle fasciotomy, (micro)fasciectomy) in the hand under investigation. 3. Participant's affected finger exceeds a TPED over 90° (= Tubiana stage III) (this will affect the value of any US images taken) 4. Participant undergoes treatment for DD during the course of their participation in this study: exhaustive list: fasciectomy/fasciotomy/stretching braces/collagenase injections