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	Scala Marx di Valutazione dell'Attività (MARS)	International Knee Documentation Committee Subjective Knee Form
Campo	Medicina dello sport	Medicina dello sport
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	2001	2001
Ideatore	Russell G. Marx, T. J. Stump, E. C. Jones, T. L. Wickiewicz, R. F. Warren	International Knee Documentation Committee (IKDC)
Tipo	Patient self-report activity level	Patient self-report
Fonte seminale	Marx RG, Stump TJ, Jones EC, Wickiewicz TL, Warren RF. Development and evaluation of an activity rating scale for disorders of the knee. Am J Sports Med. 2001;29(2):213-218.	Irrgang JJ, Anderson AF, Boyle JB, et al. Development and validation of the International Knee Documentation Committee Subjective Knee Form. Am J Sports Med. 2001;29(5):600-613.
Alias	MARS, Marx Activity Scale	IKDC, IKDC-SK
Correlati	4	5
Sintesi	The Marx Activity Rating Scale (MARS) is a 4-item patient-reported instrument that quantifies the frequency of high-demand athletic activities performed in the past four weeks. Developed by Marx and colleagues in 2001 and published in the American Journal of Sports Medicine, the MARS focuses specifically on quantifying participation in running, cutting, decelerating, and pivoting—the high-impact, multi-directional activities that demand the most from the knee and ankle. The MARS is widely used in orthopedic research to classify patients by activity level and to assess return to activity following surgery.	The IKDC Subjective Knee Form is an 18-item patient self-report instrument that measures knee function and symptoms in individuals with various knee conditions. Developed by the International Knee Documentation Committee in 2001 and published in the American Journal of Sports Medicine, it has become the gold standard for assessing knee-specific outcomes across diverse populations, from athletes returning to sport after anterior cruciate ligament injury to patients with osteoarthritis or meniscal pathology.