Abstract: This invention relates to a modular device (10) for positioning and immobilisation of a patient's body for surgical operations, which comprises a pelvis support (20) for supporting the patient's pelvis and at least one foot tether support (30) with a foot tether fixation (50) for positioning and immobilisation of a patient's leg, whereby the at least one foot tether support (30) is pivotable in the horizontal and/or in the vertical plane with respect to the pelvis support (20). In addition, the modular device (10) according to the invention can comprise a hip support (60) for positioning the patient's hip during the operation. The invention also relates to an operating table (100) comprising the modular device (10) according to the invention.