[Purpose] The purpose of this study was to investigate the effect of co-stabilizer muscle
activation on knee joint position sense. [Subjects and Methods] This study was a pre-post,
single-blinded randomly controlled trial (angle sequence randomly selected) design. Seven
healthy adults with no orthopaedic or neurological problems participated in this study.
Knee joint position sense was measured by a target matching test at target angles of 30°,
45° and 80° of knee flexion a using digital inclinometer under two conditions: erect
sitting, which is known to highly activate co-stabilizer muscle and slump sitting, which
is known to little activate the co-stabilizer muscle. [Results] A significant difference
in joint position matching error at the knee flexion angle of 45° was founded between two
conditions erect sitting: (3.83 ± 1.47) and slump sitting: (1.00 ± 0.63). There were no
significant differences in joint position matching error at the other target angles.
[Conclusion] Knee joint position sense at 45° is likely to be affected by activation of
co-stabilizer muscle, and this value is suitable for facilitation of joint position sense
with skilled movement.
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