Hip replacements can be performed in several ways. So the answer would depend on your specific procedure.
However the general answer is that poses which require external rotation in both femurs (thigh bones) should not be done at all after a hip replacement. These are called "open pelvis poses". If you should choose to pursue a yoga practice, and I hope that you will, please unearth a highly skilled, well trained, and therapeutically oriented teacher. Wandering into nearest health club "yoga" class is ill-advised.
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