Search
Enter keywords to search for products, blog posts, and more.
Enter keywords to search for products, blog posts, and more.
Home > Long Cephalomedullary Nail (ZNN CM System)
The long cephalomedullary nail spans the femur from the trochanteric entry point to beyond the isthmus, fixing intertrochanteric and subtrochanteric fractures with a head element that runs up the neck into the femoral head. It is a genuine original implant from the Zimmer Biomet ZNN CM nailing system, stocked by BoneCraft and supplied through independent distribution.
A short nail ends where it ends — and anything below its tip is unprotected bone. When the fracture extends into the subtrochanteric region, when the canal is wide or the bone is metabolically weak, the long nail earns its place by carrying the fixation past the isthmus and giving the whole femoral shaft a load-sharing internal splint.
The cephalomedullary principle is shared with the short nail: a lag element crosses the neck into the femoral head and slides as the fracture settles, while the nail body bears the bending loads of the shaft. The long version adds distal locking and full-length protection against fracture propagation in fragile bone. Fracture classification, entry point and implant length remain decisions for the operating surgeon.
The nail is inserted through a trochanteric entry portal and advanced down the canal to the planned depth. The head element is then driven up the femoral neck into the head under image control, and distal locking screws complete the construct. Length is chosen so the nail tip passes the isthmus with margin below the fracture.
| Nominal length | Code families | Diameters available |
|---|---|---|
| 300 mm | 47-2493-302 / 303 | 10 / 11 mm |
| 320 mm | 47-2493-321 / 322 / 323 | 10 / 11 mm |
| 340 mm | 47-2493-342 / 343 | 10 / 11 mm |
| 360 mm | 47-2493-362 / 363 | 10 / 11 mm |
| 380 mm | 47-2493-382 / 383 | 10 / 11 mm |
| 400 mm | 47-2493-402 / 403 | 10 / 11 mm |
| 420 mm | 47-2493-423 | 10 mm |
| 440 mm | 47-2493-442 / 443 | 11 mm |
The twenty-eight-number matrix of lengths and diameters is held in BoneCraft warehouse stock and ships in original manufacturer packaging, with factory lot references documented for the receiving facility.
