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Authors of section

Authors

Aida Garcia, Fabio A Suarez

Executive Editor

Simon Lambert

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K-wire fixation

1. General considerations

Long oblique/spiral fracture

K-wire fixation is optimal for fracture fixation in pediatric patients. In some cases, it can be used in adults with the disadvantage of not producing interfragmentary compression. It also needs longer support with a splint to prevent fracture displacement.

At least two K-wires need to be inserted in a converging or diverging manner for optimal rotational stabilization.

Reduction can be achieved in a closed or open manner. Closed reduction is easier with acute fractures and has the advantage of sparing the hematoma.

There is a risk of wire-track infection (osteitis).

Fixation with two to three K-wires in diaphyseal long oblique or spiral phalangeal hand fractures

Short oblique fracture

A short oblique fracture may be stabilized with two K-wires crossing each other.

Fixation with two K-wires in short oblique diaphyseal oblique phalangeal hand fractures

Fracture plane

Obliquity of the fracture is possible either in the plane visible in the AP view or the lateral view. Always confirm the fracture configuration with views in both planes.

AP and lateral views of oblique extraarticular fractures of the diaphyseal phalanx - hand

2. Patient preparation

Place the patient supine with the arm on a radiolucent hand table.

Patient positioned supine with the arm on a radiolucent hand table

3. Closed reduction

Reduction can be achieved by traction and lateral pressure exerted at the site of maximal displacement.

Confirm reduction clinically and with an image intensifier. If there is shortening of the finger, then there is often malrotation of the fracture.

If the fracture appears stable after reduction, nonoperative treatment can be considered. Confirming reduction with an image intensifier is then essential.

Traction and lateral pressure exerted at the site of maximal displacement to achieve reduction of an oblique diaphyseal phalangeal hand fracture

If closed reduction is not successful or in a nonacute case, proceed with an open reduction.

When indirect reduction is not possible, this is usually due to interposition of parts of the extensor apparatus.

4. K-wire fixation

Insert two to three K-wires in different directions crossing the fracture plane through both cortices. The K-wire tracks should not cross each other near the fracture plane.

Take care not to injure the extensor tendon.

Fixation with two K-wires in short oblique diaphyseal oblique phalangeal hand fractures

The ends of the K-wires may be left protruding the skin for later removal or buried under the skin.

To protect the skin, bend the K-wire ends with pliers in an L- or U-shape.

K-wire ends that protrude the skin bent in an L-shape to protect the skin

5. Checking alignment

Identifying malrotation

At this stage, it is advisable to check the alignment and rotational correction by moving the finger through a range of motion.

Rotational alignment can only be judged with flexed metacarpophalangeal (MCP) joints. The fingertips should all point to the scaphoid.

Malrotation may manifest by an overlap of the flexed finger over its neighbor. Subtle rotational malalignments can often be judged by a tilt of the leading edge of the fingernail when the fingers are viewed end-on.

If the patient is conscious and the regional anesthesia still allows active movement, the patient can be asked to extend and flex the finger.

Any malrotation is corrected by direct manipulation and later fixed.

73 P130 Lag screw fixation

Using the tenodesis effect when under anesthesia

Under general anesthesia, the tenodesis effect is used, with the surgeon fully flexing the wrist to produce extension of the fingers and fully extending the wrist to cause flexion of the fingers.

Surgeon fully flexing the wrist to produce extension of the fingers and fully extending the wrist to cause flexion of the fingers

Alternatively, the surgeon can exert pressure against the muscle bellies of the proximal forearm to cause passive flexion of the fingers.

Surgeon exerting pressure against the muscle bellies of the proximal forearm to cause passive flexion of the fingers

6. Final assessment

Confirm fracture fixation and stability with an image intensifier.

7. Aftercare

Postoperative phases

The aftercare can be divided into four phases of healing:

  • Inflammatory phase (week 1–3)
  • Early repair phase (week 4–6)
  • Late repair and early tissue remodeling phase (week 7–12)
  • Remodeling and reintegration phase (week 13 onwards)

Full details on each phase can be found here.

Postoperative treatment

The hand is supported with a dorsal splint for 4 weeks. This would allow for finger movement and help with pain and edema control. The arm should be actively elevated to help reduce the swelling.

The hand should be splinted in an intrinsic plus (Edinburgh) position:

  • Neutral wrist position or up to 15° extension
  • MCP joint in 90° flexion
  • PIP joint in extension
Dorsal splint to treat a dislocation of the proximal interphalangeal joint

The reason for splinting the MCP joint in flexion is to maintain its collateral ligament at maximal length, avoiding scar contraction.

PIP joint extension in this position also maintains the length of the volar plate.

73 P130 Lag screw fixation

Functional exercises

To prevent joint stiffness, the patient should be instructed to begin active motion (flexion and extension) immediately after surgery.

Functional exercises for the hand

Follow-up

See the patient after 5 and 10 days of surgery.

Implant removal

K-wires can be removed once consolidation of the fracture is visible.