The purpose of the study is to assess knee joint position sense, pain and dynamic balance in female with primary dysmenorrhea.
Eligibility
Sex
FEMALE
Min age
18 Years
Max age
25 Years
Healthy volunteers
Accepted
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.
Primary outcome measure(s)
Overall Stability Index (OSI) . Antero-posterior stability index score (APSI) . Medio lateral stability index score (MLSI) . Over all stability index score (OASI) — at first and fourth menstrual days The Overall Stability Index (OSI) is the primary measure of dynamic postural control obtained from the balance assessment system. It reflects the standard deviation of the participant's sway from the platform's center across both the medial-lateral and anterior-posterior directions. Higher OSI values indicate greater instability and poorer balance performance. As an integrated measure of sway variability, the OSI is considered the most comprehensive indicator of overall balance ability and is commonly used to evaluate changes in postural control in response to therapeutic interventions.
Medial-Lateral Stability Index (MLSI) — at first and fourth menstrual days The Medial-Lateral Stability Index (MLSI) quantifies the degree of side-to-side sway during balance testing. It represents the standard deviation of medial-lateral movement from the platform's center point, providing a directional measure of postural stability. Elevated MLSI scores reflect increased lateral instability, which may be associated with impaired neuromuscular control or deficits in weight-shifting ability. This variable is useful for identifying balance impairments that predominantly affect frontal plane stability.
Anterior-Posterior Stability Index (APSI) — at first and fourth menstrual days The Anterior-Posterior Stability Index (APSI) measures front-to-back sway during dynamic balance assessment. Calculated as the standard deviation of anterior-posterior deviations from the center of the platform, the APSI provides insight into sagittal plane stability. Higher APSI values indicate greater instability and reduced capacity to control forward and backward movements. This index is important for evaluating postural control related to gait, stepping, and activities requiring controlled anterior or posterior shifts in the center of gravity.
knee joint position sense — at first and fourth menstrual days using active knee position sense test by universal goniometer.
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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