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Home > Cancellous Bone Screws
Cancellous bone screws are built for trabecular bone: a deep, widely spaced thread that bites into the soft bone of the metaphysis where a cortical thread would strip. Partially threaded versions lag fragments together by design. The BoneCraft range covers four, six and six point five millimetre diameters — genuine original screws from the Zimmer Biomet trauma systems, stocked in depth and supplied through independent distribution.
The metaphysis is a different material from the shaft: a lattice of trabeculae rather than a dense wall. Screws that work in cortical bone fail there, because purchase in trabecular bone comes from thread depth and span, not from thread count. The cancellous thread — deep and wide — is engineered around exactly that difference.
The classic application is screw-only fixation of metaphyseal fragments: condyles, plateaus, malleoli, where a partially threaded screw crosses the fracture line and compresses it as it seats, often with a washer spreading the load on the thin cortex. The same screws serve as the metaphyseal partners of plate constructs. Size and configuration remain selections of the operating surgeon.
Cancellous screws are placed after drilling and measuring, with partially threaded versions positioned so the thread engages only the far fragment — the screw then lags the fracture together as it tightens. Washers are used where the near cortex is thin.
| Diameter | Role in the range | Typical application |
|---|---|---|
| 4.0 mm | Small cancellous screw | Small metaphyseal fragments, periarticular sites |
| 6.0 mm | Mid-size cancellous screw | Metaphyseal fixation where a smaller corridor applies |
| 6.5 mm | Large cancellous screw | Condyle, plateau and large metaphyseal fragments |
The size matrix of over two hundred fifty catalog numbers is stocked in BoneCraft warehouse stock and ships in original manufacturer packaging, with lot references on every shipment.
