"Knee Joint Position Sense and Dynamic Balance in Females With Primary Dysmenorrhea

Inclusion Criteria: * They should be virgin, healthy female students * They have regular menstruation (3-8 days in duration, with 21-35 days in-between). * They should have the same activity level mild active female. * Their ages will range from 18 to 25 years old. * Their body mass index (BMI) will range from 18 to 24.9 Kg/m2. Exclusion Criteria: * History of knee injury, surgery in the knee or spinal vertebrae. * Females having any vestibular problems, otitis media, labyrinthitis or any inner ear problems that affect balance * Women with any cognitive deficits * History of neuromuscular or spinal disease. * History of pelvic pathology or any gynecological disease.