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Home > Locking Cortical Screws
Locking cortical screws combine a fine cortical thread form with a locking head: the shaft thread is engineered for the dense bone of the diaphysis, while the head locks into the plate at a fixed angle. They are the shaft-end screws of locking plate constructs. The range is genuine original Zimmer Biomet product, stocked by BoneCraft in depth and supplied through independent distribution.
The shaft end of a locking plate works in different bone from the head end. Down the diaphysis the cortex is thick and dense, and the screw that anchors there should be threaded for it: a fine, shallow thread that packs maximum engagement into hard bone. That is the cortical thread form — and on a locking screw it arrives with a head that fixes its angle in the plate.
The combination matters in long bridging constructs, where the shaft screws carry the working length of the plate. Anchored bicortically and locked to the plate, they hold the construct to length and alignment without being crushed against the bone. Screw length for unicortical or bicortical purchase and the number of shaft screws remain choices of the operating surgeon.
The screws are driven through the system drill guide so the locking head engages the plate hole squarely, and length is measured for the intended unicortical or bicortical anchorage. The cortical thread is at home in the diaphysis, where the shaft segment of the plate does its work.
| Diameter | Length span in range | Typical plate region |
|---|---|---|
| 2.7 mm | 10 to 40 mm | Shaft end of small periarticular plates, foot and wrist |
| 3.5 mm | 10 to 100 mm | Shaft screws of standard periarticular locking plates |
| 4.5 mm | 20 to 100 mm | Heavy locking plate constructs |
The one-hundred-forty-number size matrix is held in BoneCraft warehouse stock and ships in original manufacturer packaging, with factory lot references on the delivery documents for hospital receiving and traceability files.
