The musculoskeletal system represents a holistic movement organization emerging from the integrated function of the central nervous system, musculoskeletal structures, and joint complexes. This organization is defined in the literature as the kinetic chain, characterized by the sequential and coordinated activation of body segments to enable distal segments to perform activities with optimal speed, position, and timing. The efficiency of the kinetic chain depends on optimal length-tension relationships, neuromuscular control, and balanced load transfer between segments. As the initial point of contact with the ground, the foot functions not merely as a passive support surface but as a dynamic structure actively involved in postural control, balance, and the regulation of ground reaction forces. Plantar pressure distribution and Center of Pressure (CoP) dynamics are considered objective indicators of foot-ground interaction. Due to its complex anatomical and biomechanical structure, any mechanical disturbance within the foot can influence the loading patterns of the entire kinetic chain.Abnormal plantar pressure distribution-characterized by increased peak pressures, altered forefoot-rearfoot load ratios, and increased CoP variability-may lead to compensatory load redistribution in proximal joints. These compensations have been associated with altered motor strategies, reduced neuromuscular control, and impaired shock absorption. Consequently, such alterations may contribute to the development of pain in proximal regions. This suggests a potential association between plantar pressure patterns and pain localization and severity in young adults.

The musculoskeletal system is a complex and integrated structure in which movement emerges through the coordinated interaction of the central nervous system, musculoskeletal components, and joint complexes. This coordinated system is commonly conceptualized as the kinetic chain, which refers to the sequential and synchronized activation of body segments to allow distal segments to perform functional tasks with optimal timing, velocity, and alignment. The effectiveness of the kinetic chain is strongly influenced by biomechanical and neuromuscular factors, including optimal length-tension relationships, efficient neuromuscular control, and the balanced transfer of forces across interconnected segments.

Within this system, the foot represents the first point of contact with the ground and plays a crucial role in both static and dynamic conditions. Rather than acting as a passive structure, the foot functions as an active and adaptive component responsible for maintaining postural control, regulating balance, and modulating ground reaction forces. Plantar pressure distribution and Center of Pressure (CoP) parameters are widely accepted as objective measures reflecting the interaction between the foot and the ground. These parameters provide insight into load distribution patterns, stability, and movement strategies during both standing and gait.

The anatomical and functional complexity of the foot contributes to its role as a highly integrated biomechanical system. The presence of multiple bones, joints, ligaments, and muscles-many of which span more than one joint-enables the foot to adapt to varying mechanical demands. However, this complexity also makes the system susceptible to dysfunction. Any mechanical alteration within the foot, such as changes in plantar pressure distribution, can disrupt normal load transmission and consequently affect the entire kinetic chain.

Abnormal plantar pressure distribution is typically characterized by increased peak pressure values, altered forefoot-to-rearfoot load ratios, and increased variability in CoP movement. These changes may indicate inefficient load absorption and distribution during both static stance and dynamic activities such as walking. As a result, compensatory mechanisms may develop in proximal segments, including the knee, hip, and lumbar spine, in order to maintain functional movement and stability.

Previous studies have demonstrated that individuals experiencing musculoskeletal pain, particularly in the lower back, exhibit altered plantar pressure patterns during standing and walking compared to healthy individuals. These alterations are often interpreted as adaptive motor strategies aimed at minimizing discomfort. However, while such compensations may provide short term benefits, they may lead to long-term negative consequences, including disrupted muscle activation patterns, reduced neuromuscular control, and decreased efficiency in shock absorption. The cumulative effect of these alterations can result in impaired static and dynamic stability, further exacerbating abnormal loading patterns within the foot. This creates a cyclical process in which changes in plantar pressure distribution contribute to proximal dysfunction, which in turn reinforces abnormal movement patterns. Consequently, disturbances originating at the distal level may have significant implications for the entire kinetic chain. Understanding the relationship between plantar pressure distribution and pain characteristics is therefore of clinical importance. The use of pain mapping techniques in conjunction with plantar pressure analysis may provide valuable insights into how specific pressure patterns relate to localized pain regions. Such findings could support the development of targeted rehabilitation strategies aimed at optimizing load distribution, improving neuromuscular control, and reducing pain. In this context, investigating the association between plantar pressure distribution and pain localization and severity in young adults may contribute to a better understanding of biomechanical and neuromuscular factors underlying musculoskeletal pain, ultimately informing both preventive and therapeutic approaches.

Inclusion Criteria:

• Young adults aged between 18 and 35 years
• Ability to stand and walk independently
• Adequate cognitive function to understand and follow the measurement procedures
• Willingness to participate voluntarily and provide written informed consent
• Absence of acute lower extremity pain or injury on the day of assessment
• Not using any assistive devices (e.g., orthoses, canes) during measurement

Exclusion Criteria:

• History of a foot deformity diagnosed during childhood
• History of musculoskeletal injury involving the lower extremity or lumbar region within the past 12 months
• Previous surgery involving the lower extremity or lumbar region
• Any condition that may affect general motor function, balance, circulation, sensory function, or pain perception

Participants will be recruited using a convenience sampling method from the local population, primarily consisting of university students and their peers.