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Each Kerrison is photographed individually. Filling gaps in a graduated set? Tell us the bite widths you need. We will tell you what we can cover from stock.
Buyer's guide
Bite width
Bite width is the defining specification of a Kerrison rongeur. It is measured across the biting surface in millimeters, and common widths run from about 1 mm to 6 mm. Many sets are graduated, such as a run from 2 mm to 5 mm. Which width suits a level or approach is a clinical decision for your surgeons.
Bite direction, angle and handle geometry
Up-bite and down-bite describe which way the jaw is angled relative to the shaft. Common bite angles are 40 degrees and 90 degrees, and other angles exist. Handle style and working length vary between patterns too. Which direction, angle and length suit an approach is a clinical decision for your surgeons. When replacing a Kerrison, match what is marked on the one you have.
Detachable-tip or one-piece
Take-apart designs come apart into separate components; one-piece designs do not, so they have fewer parts to lose or mismatch. Ejector variants push the bone fragment clear of the jaw. Preference varies between surgeons, so confirm what your team expects before substituting one for the other. On a take-apart pattern, check the listing photos to see that all parts are present, and ask us if it is unclear.
Specifications
| Specification | Common values |
|---|---|
| Bite Width | About 1 mm to 6 mm |
| Bite Direction | Up-bite or down-bite |
| Angle | Commonly 40 degrees and 90 degrees |
| Working Length | Commonly 15 cm to 23 cm |
| Handle Type | Standard or thin-line |
| Design | Ejector or non-ejector; detachable-tip (take-apart) or one-piece |
| Footplate | Standard or thin / low-profile |
Trusted brands
Manufacturers of this equipment include:
Ruggles
Clear Choice Medical is an independent supplier. We are not affiliated with, sponsored by, endorsed by, or an authorized dealer for any manufacturer named on this page. Manufacturer names and model designations appear solely to identify equipment and describe compatibility.
Buyer FAQ
Is a Kerrison the same thing as a rongeur?
A Kerrison is a type of rongeur, but a specific one. General orthopedic rongeurs such as the Leksell take cupped bites with opposing jaws. A Kerrison has a flat footplate that slides beneath bone and a punch that closes against it. For general bone rongeurs, see our orthopedic rongeurs page.
What do 40 degree and 90 degree actually refer to?
They give the bite angle, which is the angle of the jaw relative to the shaft. A 90-degree jaw sits at a right angle to the shaft, and a 40-degree jaw sits at a shallower angle. Which angle suits a case is a clinical decision for your surgeons. When replacing a Kerrison, match the angle marked on the instrument or stated by the manufacturer.
What is a thin footplate for?
A thin or low-profile footplate is a thinner version of the plate at the tip, so it takes up less space beneath the bone. It is a separate pattern from the standard footplate, and a listing should say which one it is. Whether a case calls for one is a clinical decision for your surgeons.
How is bite width measured?
Bite width, sometimes called jaw width, is measured across the biting surface in millimeters. It is the number most listings lead with.
Do you sell graduated sets?
We list individual instruments and, when we have them, sets. If you are assembling or completing a ladder, send us the widths and angles you need and we will tell you what we can cover from stock and hold it while you decide.
Do items arrive sterile?
No. Everything ships non-sterile and is processed by your facility per its own protocols and the manufacturer instructions before clinical use. Before we acquire an instrument, the hospital or manufacturer it comes from must clean and sterilize it.
What information do I need to match a replacement Kerrison rongeur?
A replacement Kerrison is identified by more than bite width. Relevant details include the manufacturer and model or reference number, bite direction, bite angle, working length, footplate profile and handle pattern. These features separate instruments that may look similar in a photograph. If the model marking is incomplete, the remaining markings and stated dimensions provide useful identifying information. A shared bite width alone does not establish that two Kerrisons are the same instrument.
What is the difference between an up-bite and a down-bite Kerrison rongeur?
Up-bite and down-bite describe whether a Kerrison's jaw is angled upward or downward relative to the shaft. They identify different jaw configurations, not differences in the instrument's overall length or bite width. The terms are useful when looking at Kerrison listings because otherwise similar instruments can have opposite bite directions. A clear listing identifies the direction alongside the other stated dimensions, so the buyer can tell which configuration is being offered.
What does detachable-tip or take-apart mean on a Kerrison rongeur?
Detachable-tip and take-apart describe a Kerrison design with components intended to separate, rather than a permanently assembled one-piece construction. The name does not specify bite width, footplate profile, angle or working length. It is therefore possible for take-apart Kerrisons to have different dimensions and configurations. When a listing offers a complete instrument or only a component, that distinction should be clear from the product description and the pieces actually shown.
What does working length mean on a Kerrison rongeur?
Working length means the stated usable reach of a Kerrison rongeur. It is not the same measurement as bite width or overall length. Different listings may not use the same reference points, so a number is useful only when the measurement is identified. A photograph alone cannot establish an exact working length. The stated dimension helps distinguish otherwise similar Kerrison patterns without substituting for their other identifying specifications.
About Kerrison rongeurs
A Kerrison rongeur is also called a Kerrison punch. It has a flat footplate at the tip and a punch that slides along the shaft to close against it. The footplate is placed beneath the bone to be removed, and each squeeze of the handle takes off a small fragment. Because the footplate sits between the cutting edge and whatever lies underneath, bone can be removed in small increments.
That single design decision explains most of the specification list. Footplate thickness matters because the plate has to fit into a space that may be very tight. Bite width matters because it sets how much bone leaves per pass. Bite angle matters because the footplate has to sit flat against the underside of the bone. The angle of approach varies between procedures.
Kerrison rongeurs are often kept as graduated sets. A set might run from 2 mm to 5 mm in a 40-degree bite, with some 90-degree bites alongside. A missing size leaves a gap in the set, and single instruments can be bought to fill it.
When evaluating a used Kerrison, the areas worth looking at closely are the footplate tip for bending or burring, the jaw closure for a flush meet with no light gap, the slide action for smoothness without grinding or catching, the return spring for full and even travel, and the pivot for lateral play. On take-apart designs, the additional question is whether every component is present and originally matched to that instrument. Each Kerrison is photographed individually, and we will send further images of any of those areas before purchase.
Start an order with four details: bite width, bite direction, angle and working length. The manufacturer, the model or reference number, the footplate profile and the handle pattern narrow it further.
Related pages
Not sure it is the right match? Call us at 727-482-5016 before you order. Tell us what you are matching to and we will confirm fit against the listing photos.