Wright described this technique which has the advantage of being relatively easy.
|Screw entry point|
To be able to place bilateral laminar screws, one must plan the starting holes such that both screws are feasible. One side must be as cranial as possible, while the other side as caudal as possible to allow for both screws.
Place a small burr hole as the starting point for the laminar screws.
Use a pedicle probe directed as dorsally as possible so as to avoid intrusion into the spinal canal.
Tap, measure the length, and insert polyaxial screws. Often screw lengths of 25-35 mm are possible. A screw that perforates the dorsal cortex of the lamina is perfectly acceptable and may in fact be desirable in cases of severe osteoporosis.