Page 18 - Digi-Med_HBS-Snap-Off-Schrauben-2021-03-29

SURGICAL TECHNIQUE

SURGICAL TECHNIQUE

HAND AND FOOT SURGEY WEIL OSTEOTOMY

1. EXPOSURE

The procedure is performed using a dorsal intermetatarsal and/or
transverse approach. After the two extensor muscles have been separated:
- Hohmann retractors are placed on both metatarsal sides.
- The metatarsophalangeal joint is dislocated between the extensor
digitorum longus and the extensor digitorum brevis.
- A Hinge spreader is inserted to protect the extensor muscles
and afford good exposure for the osteotomy

2. OSTEOTOMY

Osteotomy is performed using an oscillating saw:
- Make a 3 cm (approximately) horizontal cut parallel to the sole,
to increase the interfragmental contact area and thus enhance healing.
- Osteotomy results in spontaneous recession of the metatarsal
head, which relieves tension on soft tissue.

3. TRANSLATION

- Grasp the matatarsal head with Kocher forceps.
- Use the “Index Plus Minus“ formula and the Lelévre Curve to determine
the amount of recession of the metatarsal head.
- The metatarsal head must be held in the correct position for for ubsequent
screw fixation.

4. INSERTION OF THE SNAP-OFF SCREW
- Connect the screw inserter to the power drill, and drive the screw into the
metatarsal.
- The inserter snaps off as soon as the screw head makes contact with the
dorsal cortex.
- If necessary, insertion of the screw can be completed with the special
screwdriver (with 3 notches).

5. RESECTION OF THE BONE PEAK
- Bone peak is resected using Liston pliers. This allows deep flexion of the
metatarsophalangeal joint.
- It may be necessary to perform a Z-shaped release (Green
technique) of the extensor muscles.

digimed Medizintechnik assumes no liability as described in this user guide of non-compliance
defects and damage.

CATALOGUE NUMBER CAUTION
DO NOT REUSE
BATCH CODE
USE BY
MANUFACTURER

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