FaceNit was spot on in one of her previous posts.
I don't have maxillary retrusion. However, most often recession is not just limited to part of the (lower) midface. If the lower part of the zygomatic bone is recessed; often the upper part of the zygomatic bone doesn't have strong projection either. If you have a recessed lower zygomatic bone, then most likely that recession extends upwards towards the inferior orbital rim, and/or it is not unlikely that the medial and lateral inferior orbital rim would be partly recessed to. In my case: the lateral part of the zygoma above the malar prominence is recessed, as is the lateral inferior orbital rim.
In general, to get 'high cheekbones' not just the lower part of the zygomatic bone should be addressed (unless the upper part has strong projection naturally). And the zygomatic sandwich osteotomy augments only the lower part of the zygomatic bone. If you look at the cuts made for the zygomatic sandwich osteotomy, you can see only the lower part of the zygomatic bone is moved. Not the upper part of the zygomatic bone (extending towrds the inferior orbital rim, and/or the inferior orbital rim itself).
Reading a bit up on the forum, sometimes it is suggested to get a zygomatic sandwich osteotomy to get strong, high cheekbones. However the zygomatic sandwich osteotomy will not yield that aesthetic result of high cheekbones, unless you already have strong projection above the malar prominence towards the inferior orbital rim (and strong medial and lateral orbital rims) naturally. (Which is not at all that likely if the lower zygomatic bone is recessed. Since, as written above: if you have recessed lower zygomatic bones, most likely you will have some recession of a bigger part of the zygomatic bone, such as the upper part of the zygomatic bone extending towards the inferior orbital rims, and/or along the orbital rims themselves).
If you are hoping to get some augmentation of the lower part of the zygomatic bone: the zygomatic sandwich osteotomy can give you some extra width and (limited) forward projection at the lower part of the zygomatic bone.
A member here underwent a lefort iii (Earl). He wrote several times the lefort i does not address the inferior orbital rim; and neither does the zygomatic sandwich osteotomy. He was absolutely right. The procedure that does address the lateral and medial inferior orbital rim, as well as the area above the malar prominence exending into the inferior orbital rim, is the (modified) lefort iii he underwent.
Rico wrote the same thing. That the zygomatic sandwich osteotomy does not address the area extending into the inferior orbital rim. You would need a different type of zygomatic osteotomy (or a (modified) lefort iii) to address that area. Some zygomatic osteotomies address the area extending towards the inferior orbital rim. However, as mentioned the zygomatic sandwich osteotomy addresses only the lower part of the zygomatic bone, and the cuts made for this type of osteotomy illustrate exactly that.
In my case 'high cheekbones' were the anticipated results. In general I don't have a deformed result or even a bad looking result. I just have augmentation/fullness of the lower part of the zygomatic bone. The upper part of the zygomatic bone, extending towards the inferior orbital rim is still recessed. (In my case mostly the lateral part, since medially I had good projection naturally/from myself). This looks like lower cheekbones rather than high cheekbones, and it is not what was anticipated. As mentioned I am unhappy.
A revision would be complex, since if I were to somehow address a broader part of the zygomatic bone with a different type of zygomatic osteotomy than the sandwich osteotomy, I now might end up with an overprojected lower zygomatic bone. Which might look awkward. After all the lower part of the zygomatic bone was aready augmented with the sandwich osteotomy and if I were to augment a bigger part of the zygomatic bone (as I would have liked in the first place), that same lower part of the zygomatic bone would be augmented once again. (Unless I would have the zygomatic sandwich osteotomy revised while getting a different zygomatic osteotomy, but that would be very complex revision and probably not worth the risk for me).