Tibia – Posterolateral Approach

Modern Study Review (AI-Generated)

High-Yield Summary

The posterolateral approach to the tibia provides targeted access to the middle two-thirds of the tibial shaft, especially useful when anterior or anteromedial soft tissues are compromised by scarring or infection. It exploits a safe internervous plane between the tibial nerve-innervated posterior compartment muscles and the superficial peroneal nerve-innervated lateral compartment muscles. Although less commonly employed than the anteromedial approach, it remains the gold standard for complex trauma, infected nonunions, or posterior/posterolateral tibial pathology requiring direct visualization and fixation.

Applied Anatomy & Intervals

Internervous Interval

• Posterior compartment: Muscles innervated by the tibial nerve (gastrocnemius, soleus, flexor hallucis longus [FHL])
• Lateral compartment: Muscles innervated by the superficial peroneal nerve (peroneus brevis [PB], peroneus longus [PL])

Anatomic Landmarks

• Lateral head of gastrocnemius: Posterior boundary of dissection
• Fibula: Key bony landmark for muscle origins and retraction
• Lesser saphenous vein: Superficial landmark to preserve during flap elevation
• Posterior border of tibia: Final target for exposure and fixation

Patient Positioning & Setup

Table Type

• Standard orthopedic table capable of supporting lateral decubitus positioning

Patient Position

• Lateral decubitus with affected leg uppermost, approximately 45° tilt
• Thigh tourniquet applied for a bloodless field

Specialized Equipment

• Limb positioner or supports to maintain leg stability
• C-arm fluoroscopy positioned for anteroposterior (AP) and lateral tibial views

Surgical Technique (The “Vital Steps”)

Incision & Superficial Dissection

• Longitudinal incision centered over the posterolateral tibia, extending from just distal to the fibular head to the distal third of the tibia
• Elevate skin flaps carefully, preserving the lesser saphenous vein

Deep Dissection & Exposure

• Incise deep fascia in line with the skin incision
• Identify and develop the plane between lateral head of gastrocnemius/soleus (posterior) and peroneus brevis/longus (anterior)
• Identify and protect muscular branches of the peroneal artery near the proximal incision
• Retract lateral border of soleus medially and posteriorly
• Identify FHL muscle arising from the posterior fibula
• Detach distal soleus origin from fibula and retract medially/posteriorly
• Detach FHL origin from fibula to improve exposure
• Dissect medially across the interosseous membrane, detaching tibialis posterior (TP) fibers arising from it
• Follow interosseous membrane to lateral border of tibia
• Subperiosteally elevate posterior tibial surface for plating or fixation

The “Danger Zone”

Post-Operative Pearl

Early mobilization is encouraged; however, avoid forced plantarflexion or inversion stresses that strain the posterior compartment muscles and neurovascular bundle. Weight-bearing protocols depend on fixation stability but typically begin with protected weight bearing.

Classic Clinical Notes

Tibia – posterolateral approach

• Used to expose middle 2/3 of tibia when skin over subcutaneous surface is badly scarred or infected.

• Position: 45° lateral decubitus position with affected leg up with tourniquet.

• Internervous plane: Gastrocnemius/soleus/FHL (tibial nerve) & peroneal muscles (superficial peroneal nerve).

• Dissection:
• Reflect skin flaps taking care with lesser saphenous vein.
• Incise fascia in line with incision.
• Find plane between lateral head of gastrocnemius/soleus posterior and peroneus brevis/longus anterior.
• Muscular branches of peroneal artery lie with peroneus brevis in proximal part of incision.
• Find lateral border of soleus and retract medially and posteriorly.
• Identify FHL below arising from posterior surface of fibula.
• Detach lower part of origin of soleus from fibula and retract medially and posteriorly.
• Detach FHL from origin on fibula.
• Dissect medially across interosseous membrane detaching fibers of tibialis posterior that arise from it.
• Follow interosseous membrane to lateral border of tibia.
• Expose posterior surface of tibia subperiosteally.

• Dangers:
• Lesser saphenous vein – may be damaged when skin flaps are mobilized.
• Peroneal artery – branches cross between gastrocnemius and peroneus brevis muscles.
• Posterior tibial artery and tibial nerve – lie posterior to FHL and tibialis posterior.

Last Updated on January 25, 2026 by orthonet