
12/06/2025
The fundamental principle of Humeral Intracondylar Repair System (HIRS) is to apply the principles on non union management to HIF which are:
✅Debride the sclerotic bone to allow vascular access
✅Bone Grafting to encourage healing
✅Stable fixation with compression
HIRS was designed to optimise healing and minimise complications for cases of HIF and humeral condylar fractures. The screw is titanium alloy, self-tapping, headless, and self-compressing.
Demineralised Bone Matrix (DBM) is canine bone allograft which has osteoinductive (stimulates bone formation) and osteoconductive (a surface for which bone to grow on) properties.
DBM is prepared from cortical bone which contains osteoinductive growth factors (BMPs) including those relevant to bone healing. The presence of BMP can be demonstrated by implanting DBM in vivo and examined under microscope for new bone formation. The figure below shows the H&E stained DBM after 28 days of implantation in thigh muscle of an athymic mouse, showing new bone forming elements such as osteocytes, adipocytes, bone marrow, new osteons, etc.
➡Filling the void!
When using our HIRS screw, once you are happy that the implant is seated appropriately we can ‘fill the void’ surrounding the shaft of the HIRS screw with DBM to encourage healing.
Position the implant so a cutting flute lines up with the cranial edge of the hole.
You can then use a large gauge intravenous (IV) catheter (18G min) to apply the Demineralised Bone Matrix putty. Check the putty is flowing from the tip, once confirmed that there is no obstruction, we can advance the IV catheter down the cutting flute into the void that exists around the core of the screw. We can slowly and gradually back-fill the void while withdrawing from the void, until we have putty extruding from around the implant. We can then tighten up the screw until it bottoms out. At this point we can take 3-5 mins to allow the tissues to relax and give one final turn on the HIRs screw to tighten.
https://www.fusionimplants.com/product/demineralised-bone-matrix-0-5cc/
https://www.fusionimplants.com/product/hirs/