It has been shown that foot and ankle postural disorders can alter the biomechanic of lower extremity and pelvis. This situation can affects balance, postural control and phsical performance of individual adversely. However, it is unknown whether the muscles that control lumbopelvic are affected or not affected. The aim of this study is to investigate the relationship between foot-ankle characteristics and lumbopelvic control, balance and physical performance in healthy young adults.

A healthy load distribution at the foot depends on the ability of the foot to fulfill both the task of stabilization and mobilization. Studies related foot movement disorders usually focus on subtalar joint. The reason for this is that subtalar joint transmits the rotations which in leg to the foot. One of the deformities affecting the foot and subtalar joint is pes planus. Kosashvili et al. have shown that grade 2 and 3 pes planus can affect the lower limb biomechanical alignment, resulting in an increase in perceived pain associated with the knee, hip and pelvic region. Problems related to foot and ankle can affect the balance of individuals as well as affect the pelvic region. Sung et al. have shown that the postural stability and balance of individuals with pes planus are worse than those without pes planus. Studies showing that foot-ankle postural disorders negatively affect physical fitness and motor performance of individuals are also present. Akaras et al. have stated that the increase in pronation in the hindfoot affects individuals' leap and agility performance negatively. It has shown that leg-related problems can affect upper. However, there is no objective study of ultrasonographic imaging of core muscles in foot-ankle problems. The aim of this study is to investigate the relationship between foot-ankle characteristics and lumbopelvic control, balance and physical performance in healthy young adults.

Inclusion Criteria:

• Volunteering to participate.
• Be between the ages of 18 and 25
• Being a normal weighted individual with a body mass index from 18.5 to 24.9

Exclusion Criteria:

• Presence of any systemic, locomotive or foot related problem
• Undergone any surgical operation related to the foot
• To have loss of sense, diabetic or peripheral neuropathy
• The presence of any problem with the spine (back pain, scoliosis, past surgeons)
• Presence of any neurological problem

64 healthy young adults