BACKGROUND:Any pathomechanical change in the foot or ankle is expected to cause adverse biomechanical effects on the lumbopelvic region. However, no objective data can be found in the literature regarding the effects of M. Transversus abdominus (mTrA) and M. Lumbar multifidus (mLM), which are effective muscles in lumbopelvic motor control, or regarding the extent of their effects.

METHODS:A total of 64 healthy young adult volunteers were assessed by a physiotherapist experienced in treating feet, and also a radiologist specialized in muscular imaging. In the determination of biomechanical properties of the foot, the navicular drop test (NDT), foot posture index (FPI), pedobarographic plantar pressure analysis, and isokinetic strength dynamometer measurements were used in determining the strength of the muscles around the ankle. Ultrasonographic imaging was used to determine the thicknesses of mTrA and mLM.

RESULTS: Significant correlation was found between the NDT results and the thicknesses of mTrA and mLM (p<.05), and also between the FPI results and the thicknesses of mTrA (p<.05). As the peak pressure of the foot medial line increased, mTrA and mLM thicknesses decreased (p < .05). Although dorsiflexion muscle strength was also effective, mTrA and mLM thicknesses were found to increase especially as the plantar flexion muscle strength increased (p<.05).

CONCLUSIONS:The results of the current study showed that the biomechanical and musculoskeletal properties of the foot-ankle are associated with lumbopelvic stability.

Keywords: foot, ankle, lumbopelvic control

Level of Evidence: II.

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