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In this paper we review some aspects of the theory of magnetic threadeddisks. We discuss in particular the equations that determine the position ofthe inner disk boundary by using different prescriptions for the neutronstar-accretion disk interaction. We apply the results to several accretionpowered X-ray pulsars that showed both quasi-periodic oscillations in theirX-ray flux and spin-up/spin-down torque reversals. Under the hypothesis thatthe beat-frequency model is applicable to the quasi-periodic oscillations, weshow that these sources provide an excellent opportunity to test models of thedisk-magnetosphere interaction. A comparison is carried out between themagnetospheric radius obtained with all the prescriptions used in threaded diskmodels; this shows that none of those prescriptions is able to reproduce thecombination of quasi-periodic oscillations and torque behaviour observed fordifferent X-ray luminosity levels in the X-ray pulsars in the present sample.  This suggests that the problem of accretion disk threading by stellarmagnetic field is still lacking a comprehensive solution. We discuss briefly anoutline of possible future developments in this field.

Can disk-magnetosphere interaction models and beat frequency models for quasi-periodic oscillation in accreting X-ray pulsars be reconciled?