CoLag® screws are cannulated, headed compression screws for foot and ankle surgery. Their proximal thread and head design gives what CONMED calls Compressive Stability: dual-lead distal threads for insertion, and a differential pitch between the distal threads and the threads under the head that compresses the fragments as the screw advances.
The low-profile head can be countersunk. The screws are self-drilling and self-tapping, with the insertion feel of a conventional headed screw, and Lavender Medical supplies the Ø 6.7 mm screws, 30 to 115 mm, which are also used as the compression screw with CoLink NeoFuse ankle fusion plates.
Features
- Head threads and head design that add compression and stability as the head seats.
- Differential-pitch threads for compression across the fracture or fusion site.
- Dual-lead distal threads for insertion.
- Low-profile head that can be countersunk; the head also eases removal if needed.
- Self-drilling and self-tapping.
- Ø 6.7 mm, 30 to 115 mm, compression or fully threaded.
- Washer for the 6.7 mm screw.
- Titanium alloy, each screw delivered sterile.
Indications
Internal fixation in the foot and ankle; the Ø 6.7 mm screw is used as the compression screw across the tibiotalar joint with CoLink NeoFuse ankle arthrodesis plates.
Indications, contraindications, warnings and precautions are listed in the instructions for use (IFU).
How it works
- A wire guide in the drill guide places a K-wire of the size for the chosen screw.
- The wire guide is removed and the depth gauge, passed over the K-wire inside the drill guide, gives the screw length.
- The cannulated drill is passed over the K-wire to the planned depth.
- The cannulated screw is inserted with the matching Torx driver shaft on the ratcheting handle. The distal threads advance faster than the head threads, compressing the bone segments; as the head threads seat in the near segment, compression increases until the head is fully seated.
Screw sizes
- Ø 6.7 mm: 30 to 115 mm, compression or fully threaded; T25 driver, 4.8 mm drill, 2.2 mm K-wire.
- Washer available for the 6.7 mm screw.
Sizes and ordering
Screws are titanium alloy and delivered individually in sterile packaging. Codes are from CONMED's CE-market catalogue (2025) and the CoLag surgical technique (SP-15004-03 Rev. D). Lavender Medical supplies the Ø 6.7 mm screws.
CoLag screws, Ø 6.7 mm31 items
| Ref. | Length |
|---|---|
| P65 ST630 | 30 mm |
| P65 ST632 | 32 mm |
| P65 ST634 | 34 mm |
| P65 ST636 | 36 mm |
| P65 ST638 | 38 mm |
| P65 ST640 | 40 mm |
| P65 ST642 | 42.5 mm |
| P65 ST645 | 45 mm |
| P65 ST647 | 47.5 mm |
| P65 ST650 | 50 mm |
| P65 ST652 | 52.5 mm |
| P65 ST655 | 55 mm |
| P65 ST657 | 57.5 mm |
| P65 ST660 | 60 mm |
| P65 ST662 | 62.5 mm |
| P65 ST665 | 65 mm |
| P65 ST667 | 67.5 mm |
| P65 ST670 | 70 mm |
| P65 ST672 | 72.5 mm |
| P65 ST675 | 75 mm |
| P65 ST677 | 77.5 mm |
| P65 ST680 | 80 mm |
| P65 ST682 | 82.5 mm |
| P65 ST685 | 85 mm |
| P65 ST687 | 87.5 mm |
| P65 ST690 | 90 mm |
| P65 ST695 | 95 mm |
| P65 ST700 | 100 mm |
| P65 ST705 | 105 mm |
| P65 ST710 | 110 mm |
| P65 ST715 | 115 mm |
CoLag screws, Ø 6.7 mm, fully threaded31 items
| Ref. | Length |
|---|---|
| P65 ST830 | 30 mm |
| P65 ST832 | 32 mm |
| P65 ST834 | 34 mm |
| P65 ST836 | 36 mm |
| P65 ST838 | 38 mm |
| P65 ST840 | 40 mm |
| P65 ST842 | 42.5 mm |
| P65 ST845 | 45 mm |
| P65 ST847 | 47.5 mm |
| P65 ST850 | 50 mm |
| P65 ST852 | 52.5 mm |
| P65 ST855 | 55 mm |
| P65 ST857 | 57.5 mm |
| P65 ST860 | 60 mm |
| P65 ST862 | 62.5 mm |
| P65 ST865 | 65 mm |
| P65 ST867 | 67.5 mm |
| P65 ST870 | 70 mm |
| P65 ST872 | 72.5 mm |
| P65 ST875 | 75 mm |
| P65 ST877 | 77.5 mm |
| P65 ST880 | 80 mm |
| P65 ST882 | 82.5 mm |
| P65 ST885 | 85 mm |
| P65 ST887 | 87.5 mm |
| P65 ST890 | 90 mm |
| P65 ST895 | 95 mm |
| P65 ST900 | 100 mm |
| P65 ST905 | 105 mm |
| P65 ST910 | 110 mm |
| P65 ST915 | 115 mm |
CoLag washers1 item
| Ref. | For screw |
|---|---|
| P65 ST067 | Ø 6.7 mm |
CoLag instruments5 items
| Ref. | Description |
|---|---|
| P06 208A00 | CoLag 5.0/6.7 mm instrument tray, base and lid |
| P06 N0291 | Guide wire, single trocar, 2.2 mm × 9 in, for Ø 6.7 mm screws |
| P06 N0631 | Cannulated driver, T25, Hudson, for Ø 6.7 mm screws |
| P06 N0562 | Cannulated lag screw reamer, 4.8 mm, Hudson, for Ø 6.7 mm screws |
| P06 N0601 | Cannulated countersink, Hudson, for Ø 6.7 mm screws |
Codes and sizes are taken from the manufacturer's marketing literature and may change. For current information, check the ConMed website or the instructions for use before ordering.
Surgical Technique
Product information
How do CoLag screws compress?
The leading threads are dual-lead and have a different pitch from the trailing threads under the head, so the screw compresses the bone segments as it advances. The threads under the low-profile head then add compression and stability as the head seats.
Can the head be countersunk?
Yes. The low-profile head can be countersunk, using the countersink for the screw diameter.
Is a fully threaded version available?
Yes. The Ø 6.7 mm screw is available as a compression screw and as a fully threaded screw, 30 to 115 mm.
Are the screws self-drilling?
Yes. They are self-drilling and self-tapping, with the insertion feel of a conventional headed screw.
What are they made of?
Titanium alloy (ASTM F136).
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