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Home > Cobalt-Chromium Polyaxial Locking Screws
Cobalt-chromium polyaxial locking screws combine two engineering choices in one implant: a variable-angle head that lets the surgeon aim the screw within a cone before it locks, and a cobalt-chromium-molybdenum alloy whose strength allows slim diameters for small bones and articular fragments. They are genuine original Zimmer Biomet components, stocked by BoneCraft and supplied through independent distribution.
Fixed-angle locking assumes the fragment sits where the hole points. Real fractures are less cooperative: the piece that matters is often a few degrees off the planned trajectory, behind a tendon, or sharing space with another screw. A polyaxial head removes that constraint — the surgeon aims within the allowed cone, seats the screw in the fragment, and locks it where it lands.
The alloy is the other half of the design. Cobalt-chromium-molybdenum delivers strength at diameters where stainless or titanium screws would be fragile, so polyaxial fixation reaches the small bones and thin articular fragments that need it most. Aiming, angulation and fragment selection remain the judgement of the operating surgeon.
Polyaxial screws are inserted through the system instrumentation, angulated within the permitted cone toward the target fragment, and locked into the plate head once the trajectory is confirmed. The slim cobalt-chromium profile keeps hardware volume low around small joints.
| Diameter | Length span in range | Typical application |
|---|---|---|
| 1.5 mm | 8 to 18 mm | Small articular fragments, hand and foot |
| 2.5 mm | 14 to 28 mm | Medium periarticular fragments |
| 3.5 mm | 10 to 75 mm | Larger periarticular polyaxial constructs |
The seventy-two-number size matrix is held in BoneCraft warehouse stock and ships in original manufacturer packaging, with factory lot references on the delivery documents.
