RT Journal Article SR Electronic T1 Hand function impairment in Systemic sclerosis: Outcomes, Mechanisms and Experience (HANDSOME) – a longitudinal observational multicentre study protocol JF BMJ Open JO BMJ Open FD British Medical Journal Publishing Group SP e095283 DO 10.1136/bmjopen-2024-095283 VO 15 IS 3 A1 Greveling, Mark A1 Ong, Voon H A1 Denton, Christopher A1 Foppen, Wouter A1 Herman, Amin A1 Jeffries-Owen, Nick A1 Kortekaas, Marion A1 Masselink, Ilse A1 Mulder, Douwe J A1 Schriemer, Rita A1 Vonk, Madelon C A1 de Vries-Bouwstra, Jeska K A1 Welsing, Paco A1 Mastbergen, Simon A1 Spierings, Julia YR 2025 UL http://bmjopen.bmj.com/content/15/3/e095283.abstract AB Introduction The majority of all patients with systemic sclerosis (SSc) experience hand function impairment. The exact cause for this impairment is yet unknown. As impaired hand function hugely impacts daily functioning and quality of life, there is a high unmet need for effective treatments. With the availability of new imaging modalities, biomarkers and laboratory techniques, opportunities arise to increase insights into the factors contributing to hand function impairment. The objective of this study is to identify risk factors and underlying mechanisms leading to hand function impairment in SSc.Methods and analysis This is a longitudinal observational multicentre study in patients with very early diagnosis of systemic sclerosis and SSc under care of the Department of Rheumatology and Clinical Immunology of the University Medical Centre Utrecht (UMCU), St Antonius Hospital Nieuwegein, UMC Groningen (UMCG), Leiden UMC (LUMC), Radboudumc or Royal Free Hospital (RFH) London. Patients will be followed for 2 years. Medical history, clinical status, nailfold capillaroscopy, skin assessments, serum biomarker analysis, ultrasound, elastography and MRI will be performed, and results related to hand function measurements will be analysed.Ethics and dissemination This study was approved by the Medical Research Ethics Committee NedMec (MREC NedMec) in the Netherlands and by HRA and Health and Care Research Wales in the UK. Results will be published in scientific journals and presented at scientific congresses and patient meetings.Trial registration number NCT06133244.Protocol version V1.3 6-06-2024.