Objectives: The modified Rodnan skin score (MRSS) is used as a primary outcome measure in most therapeutic trials in systemic sclerosis (SSc) in adults. Before we can apply this outcome measure in trials in juvenile patients with SSc, we need to evaluate this assessment method in children without sclerodermatous skin changes, to establish values for the normal paediatric population.
Methods: To determine the MRSS in healthy paediatric population, patients of the paediatric rheumatology out-patient clinic with mechanical pain or with juvenile idiopathic arthritis at the age of 16 yr or under were assessed between 1 January and 31 March 2004. Patients with any sign of connective tissue disease or skin disorders, such as psoriasis or ectopic dermatitis, were excluded. The MRSS was determined at a standardized location and with a standardized pinching method.
Results: Two hundred and seventeen patients, including 100 females, were assessed. The mean age of the patients was 10.5 yr (2.9-16), the mean body mass index (BMI) was 18.3 (9.3-35.7), and the mean MRSS was 13.92 (range 4-25). The MRSS score showed a difference between males and females at every Tanner stage. There was a linear correlation between MRSS and body mass index independently of age and Tanner stage.
Conclusion: The mean MRSS in healthy children is 13.92 units and this range would be expected in a patient with a diffuse form of SSc. The MRSS score in children correlates with the body mass index and the Tanner stage, so it should be corrected to these parameters, according to this pilot study.