56: Percutaneous Pinning of Bennett Fracture and Open Reduction and Internal Fixation of Rolando Fracture

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Procedure 56 Percutaneous Pinning of Bennett Fracture and Open Reduction and Internal Fixation of Rolando Fracture

Indications

Figures 56-9 through 56-11 provided courtesy of Kevin C. Chung, MD; Figures 56-14 through 56-17 provided courtesy of Sandeep J. Sebastin, MD.

If the fracture is nondisplaced at initial presentation (uncommon), it can be treated with splint or cast immobilization for 6 weeks, followed by protected motion.

Surgery is indicated for failure to maintain acceptable reduction with splint or cast (articular step-off of <1 mm).

Most Bennett and Rolando fractures are unstable and require surgical intervention.

In most cases, closed reduction and percutaneous pinning is indicated for Bennett fractures.

Open reduction is indicated when reduction cannot be achieved by closed means (more common with Rolando fracture).

If open reduction is required, large fragments can be fixated by a variety of methods (plate, lag screw, percutaneous K-wires), whereas small fragments are best treated with K-wire fixation.

Surgical Anatomy

A Bennett fracture is a two-fragment intra-articular thumb metacarpal base fracture.

A Rolando fracture is a three-fragment intra-articular thumb metacarpal base fracture.

The thumb carpometacarpal (CMC) joint geometry is similar to two interlocking saddles, with their surfaces at 90 degrees to each other.

The volar beak ligament is deep to the superficial anterior oblique ligament (SAOL) and is an important stabilizer of the thumb CMC joint.

In a Bennett fracture, the volar beak ligament stabilizes the Bennett fragment, which is located volarly and ulnarly.

The larger fragment, consisting of the remainder of the metacarpal, must be reduced to the Bennett fragment.

The abductor pollicis longus (APL) tendon inserts on the dorsal base of the thumb metacarpal and causes dorsal subluxation and proximal displacement of the metacarpal (Fig. 56-1).

The adductor pollicis inserts on the metacarpal shaft and causes CMC flexion and adduction (see Fig. 56-1).

In a Bennett fracture, the metacarpal is supinated, adducted, and flexed, with proximal displacement and dorsal subluxation of the base.

FIGURE 56-1

Positioning

The patient is supine.

A pneumatic tourniquet is placed on the arm in case closed reduction is not possible and open reduction is required.

The extremity is placed on a hand table, with the thumb pointing upward.

The surgeon or assistant placing the K-wires sits at the patient’s axilla, facing the palm.

The surgeon or assistant performing the reduction sits at the patient’s shoulder, facing the dorsum of the hand.

Exposures

If open reduction is required, the exposure is through a modified Wagner incision (Fig. 56-2).

The longitudinal limb of the incision is along the glabrous/nonglabrous skin border.

At the thumb base, the incision turns ulnarly and extends to the flexor carpi radialis (FCR) tendon.

Dissection is carried down to the border of the thenar musculature, protecting sensory nerve branches in the subcutaneous tissue (Fig. 56-3).

A no. 15 blade is used to elevate the thenar muscles off of the metacarpal base and trapezium (Fig. 56-4).

The APL tendon is reflected ulnarly.

The joint is then exposed with a transverse capsulotomy, in the interval between the APL and the reflected thenar musculature (Fig. 56-5).

FIGURE 56-2

FIGURE 56-3

FIGURE 56-4

FIGURE 56-5

Pearls

It is important not to extend the Wagner incision ulnar to the FCR tendon, to avoid injury to the palmar cutaneous branch of the median nerve.

It is important to protect sensory nerves, such as the superficial sensory branches of the radial nerve, and smaller branches of the lateral antebrachial cutaneous nerve (LABC).

Fluoroscopy can be used to confirm joint location before capsulotomy.

Pitfalls

Injury to the palmar cutaneous branch of the median nerve by extending the incision ulnar to the FCR.

Injury to the LABC or superficial sensory branch of the radial nerve.

Excessive soft tissue elevation at the metacarpal base resulting in disinsertion of the APL—care should be taken to preserve the APL insertion.

Procedures

Closed Reduction Percutaneous Pinning of Bennett Fracture

Step 1

The Bennett fracture is reduced by radial abduction of the thumb metacarpal, longitudinal traction and pronation of the thumb metacarpal, and direct pressure applied to the dorsal base of the metacarpal (Fig. 56-6).

Reduction is checked with fluoroscopy.

FIGURE 56-6

Step 1 Pearls

Fracture reduction should be checked in multiple planes and with live fluoroscopy to ensure correct reduction of articular surface.

Step 2

While reduction is maintained, K-wires are placed.

Multiple patterns of K-wire fixation are acceptable (Fig. 56-7); the author’s preference follows.

• A 0.045-inch K-wire is advanced across the fracture, entering the radial base of the thumb metacarpal and terminating in the Bennett fragment.

• A second 0.045-inch K-wire is placed between the thumb and index metacarpals (Fig. 56-8).

FIGURE 56-7

FIGURE 56-8

Step 2 Pearls

• If placing the initial K-wire while maintaining fracture reduction proves difficult, the K-wire can be placed into the metacarpal base, but not across the fracture, with the fracture unreduced.

• Once the K-wire is in position, the fracture is reduced, and the K-wire is advanced across the fracture and into the Bennett fragment.

• K-wires should be advanced using oscillating mode on the K-wire driver, to avoid injury to sensory nerve branches.

Alternative 2

Two 0.045-inch K-wires are advanced from the radial metacarpal base, across the fracture, and into the Bennett fragment (Fig. 56-12).

FIGURE 56-12

Step 3

Final images are taken to confirm fracture reduction and K-wire position.

K-wires are cut and capped.

A forearm-based thumb spica splint is applied, with the interphalangeal joint free.

Postoperative Care and Expected Outcomes

Pins are removed 6 weeks after surgery.

Mobilization is begun 6 weeks after surgery under the guidance of a hand therapist.

Posttraumatic arthritis may develop, particularly if articular reduction is not achieved. This may or may not be clinically significant.

Radiographic and clinical outcomes are likely superior in patients who heal with less than 1 mm of articular step-off.

Open Reduction and Percutaneous Pinning of Bennett Fracture

Step 1

The fracture is reduced by the reduction maneuver described previously, combined with direct fragment manipulation.

Either 0.035- or 0.045-inch K-wires can be used as joysticks if necessary.

Fracture reduction may be maintained with a bone-reduction clamp.

Step 2

While visualizing the reduced articular surface, percutaneous K-wires are placed for fracture fixation (Fig. 56-13).

FIGURE 56-13

Step 3

K-wires are cut and capped.

A volar forearm-based thumb spica splint is placed, with the interphalangeal joint free.

Postoperative Care and Expected Outcomes

Pins are removed 6 weeks after surgery.

Mobilization is begun 6 weeks after surgery under the guidance of a hand therapist.

Posttraumatic arthritis may develop, particularly if articular reduction is not achieved. This may or may not be clinically significant.

Radiographic and clinical outcomes are superior in patients who heal with less than a 1-mm step-off.

Open Reduction and Internal Fixation of Rolando Fracture

Step 1

Fracture is exposed as described previously (Fig. 56-14).

FIGURE 56-14

Step 2

Fracture is reduced as described previously, and reduction is maintained with a bone reduction clamp or piercing towel clamp (Fig. 56-15).

FIGURE 56-15

Step 3

A T– or Y-shaped plate is placed across the fracture and secured with bicortical screws (Figs. 56-16 and 56-17).

FIGURE 56-16

FIGURE 56-17

Step 3 Pearls

Locking screws may be used in metaphyseal bone, where the cortex is thin.

Step 4

The skin is closed with simple interrupted sutures.

A sterile dressing is applied, followed by a forearm-based thumb spica splint.

The interphalangeal joint may be left free.

Postoperative Care and Expected Outcomes

Sutures are removed in 10 to 14 days, and an Orthoplast splint is made.

Active range of motion begins at 10 to 14 days, and passive range of motion when tolerated.

Strengthening begins at 6 weeks.

Good outcomes are expected if the fracture heals with acceptable articular reduction (step-off of <1 mm).

Open Reduction and Percutaneous Pinning of Comminuted Thumb Metacarpal Base Fracture

Step 1

Preoperative imaging is obtained, which demonstrates a comminuted intra-articular thumb metacarpal base fracture (Figs. 56-18 and 56-19).

FIGURE 56-18

FIGURE 56-19

Step 2

Exposure of the fracture is performed as described previously (see Figs. 56-2 through 56-5).

Step 3

The fracture is débrided as necessary with a curet, defining the fracture fragments (Figs. 56-20 and 56-21).

FIGURE 56-20

FIGURE 56-21

Step 4

The fracture is reduced by direct fragment manipulation, and K-wires are used to stabilize the fracture (Fig. 56-22).

FIGURE 56-22

Step 5

Direct inspection of the joint is used to confirm articular reduction without step-off (Fig. 56-23).

Fluoroscopy is used to confirm K-wire placement and fracture reduction (Fig. 56-24).

FIGURE 56-23

FIGURE 56-24

Step 6

The wound is irrigated, the capsule is closed with 4-0 absorbable sutures, and the skin is closed.

Pins are cut and capped, and the patient is placed in a thumb spica splint (Fig. 56-25).

FIGURE 56-25

Postoperative Care and Expected Outcomes

Same as described previously

Green DP, O’Brien ET. Fractures of the thumb metacarpal. South Med J. 1972;65:807-814.

Classic article describing extra-articular and intra-articular thumb metacarpal base fractures. The authors advocated operative stabilization for intra-articular fractures. (Level IV)

Kjaer-Petersen K, Langhoff O, Andersen K. Bennett’s fracture. J Hand Surg [Br]. 1990;15:58-61.

Long-term follow-up (7.3 years) of 41 patients with a Bennett fracture. A higher percentage of patients with good outcomes (asymptomatic) were found to have an articular step-off of less than 1 mm. (Level IV)

Timmenga EF, Blokhuis TJ, Maas M, et al. Long-term evaluation of Bennett’s fracture: a comparison between open and closed reduction. J Hand Surg [Br]. 1994;19:373-377.

Long-term follow-up (10.7 years) of 18 patients with a Bennett fracture. Posttraumatic arthritis correlated with the quality of the reduction, and was a common occurrence. (Level IV)

Related

Operative Techniques Hand and Wrist Surgery