Case Overview

Why external fixation here

• Damage control stabilization when definitive nailing/plating is delayed (swelling, blisters, open wound, polytrauma).
• Bridges the zone of injury while soft tissue optimizes, then later converted to IM nail or plate.
• Rockwood & Green's notes ex-fix is especially used for high-grade open tibial fractures and in patients where a splint is contraindicated (Rockwood and Green's Fractures in Adults, 10th ed).

Step-by-step technique (unilateral modular frame - most practical for this fracture)

• Confirm fracture pattern on fluoroscopy/imaging in theatre; mark skin landmarks and planned pin sites before draping.
• Position leg on a radiolucent table with C-arm access.

• If there's an open wound, thorough debridement first. Provisionally distract/align the limb manually or with an assistant traction.

• For the tibia, the anteromedial subcutaneous border is the safe corridor along its entire length - it avoids major neurovascular structures except the saphenous vein/nerve, which run just posteromedial and must be protected.
• Place at least 2 pins in each main fragment (proximal and distal to the fracture), a minimum of 2 finger-breadths from the fracture/zone of injury and away from the knee and ankle joint capsules.
• Use 5-6 mm half-pins for the tibia (pin diameter should not exceed about 1/3 of the bone's diameter). Make a small stab incision, bluntly spread soft tissue to bone with a mosquito clamp, then pre-drill (unless self-drilling pins are used) and insert the pin perpendicular to the anteromedial surface, engaging both cortices.
• Avoid the peroneal nerve and vascular bundle if any pins are placed more posterolaterally (relevant mainly for ring-fixator wires, less so for a simple anteromedial unilateral frame).

• Connect the two pins on each side of the fracture with a bar and pin-to-bar clamps (clamps roughly 2 finger-breadths off the skin to allow for swelling while keeping the construct stiff).
• Connect the two partial frames with a third bridging bar/rod across the fracture - leave this connection loose initially.

• Use the two partial frames as handles to correct length, angulation, and rotation (ligamentotaxis/manual traction).
• With a traditional unilateral frame, reduction must be finalized in the OR at this step (unlike computer-assisted ring fixators, which can be adjusted later).
• Once alignment is acceptable, tighten all rod-to-rod and rod-to-pin clamps fully.

• Obtain AP and lateral fluoroscopic or plain radiographic views to verify pin bicortical purchase, alignment, and that no pin has entered the joint.

• Increase stiffness by moving bars closer to bone, spreading pins farther apart on each fragment, reducing the distance between the two innermost pins across the fracture, using larger-diameter pins/bars, or adding a supplementary second rod.

• Dress pin sites, release any skin tension/tethering around pins, and start a pin-site care protocol to reduce infection risk.

Aftercare and next steps

• This fixator is typically temporary. Once soft tissue swelling/blisters resolve (usually 1-3 weeks) or the wound is controlled, it is converted to definitive fixation (IM nail or plate) - most surgeons try not to delay conversion too long because pin-tract colonization raises infection risk with subsequent nailing.
• Pin-tract infection rates are notably high with prolonged external fixation, so clinical monitoring of pin sites is necessary throughout.