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Volkmann Triangle Fixation: Surgery & Recovery

Volkmann triangle fixation is a surgical procedure used to stabilize a bony fragment at the posterior tibia following certain ankle fractures.

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Things worth knowing about "Volkmann Triangle Fixation"

Volkmann triangle fixation is a surgical procedure used to stabilize a bony fragment at the posterior tibia following certain ankle fractures.

What is Volkmann Triangle Fixation?

Volkmann triangle fixation is a surgical procedure in orthopedic and trauma surgery. It is used to stabilize the so-called Volkmann triangle – a bony fragment at the posterior inferior edge of the tibia (shinbone) that can occur in certain ankle fractures. The term “Volkmann triangle” originates from the German surgeon Richard von Volkmann, who described this anatomical region in the 19th century.

Anatomical Background

The upper ankle joint is formed by three bones: the tibia (shinbone), the fibula, and the talus (ankle bone). The posterior inferior edge of the tibia – referred to as the posterior tibial margin or “Volkmann triangle” – is an important part of the bony joint socket. In fractures involving this area – especially so-called trimalleolar fractures (three-malleolus fractures) – this triangular bone fragment can break off and significantly compromise joint stability.

Indications

Surgical fixation of the Volkmann triangle is generally required when:

The fragment involves more than 25–33 % of the tibial articular surface.
The fragment is displaced by more than 2 mm.
The ankle joint remains unstable after fixation of the other fracture components.
A posterior subluxation of the talus is present.

For smaller, non-displaced fragments, conservative treatment with immobilization may be sufficient.

Surgical Technique

Volkmann triangle fixation is performed as part of an osteosynthesis procedure – a technique in which bone fragments are realigned and stabilized using implants such as screws, plates, or a combination of both. Depending on the size and position of the fragment, various surgical approaches and implant techniques are available:

Posterior approach: Provides direct visualization of the fragment and is preferred for larger fragments.
Antegrade or retrograde screw fixation: Stabilization of the fragment using lag screws from the front or back.
Plate osteosynthesis: Use of a small buttress plate for additional stability, particularly for larger or comminuted fragments.

Fixation of the Volkmann triangle is typically performed in conjunction with stabilization of the medial (inner) and lateral (outer) malleolus as part of the overall management of a trimalleolar fracture.

Postoperative Care and Rehabilitation

After surgery, the ankle joint is typically immobilized for several weeks using a lower leg orthosis or cast. Weight-bearing on the operated leg is gradually increased:

During the first weeks: partial weight-bearing or non-weight-bearing with crutches.
After radiological confirmation of bone healing (usually after 6–8 weeks): gradual full weight-bearing.
Physical therapy to restore range of motion, strength, and stability of the ankle joint.

The full recovery process can take several months. Regular radiological follow-up examinations are important to monitor bone healing.

Possible Complications

As with any surgical procedure, Volkmann triangle fixation carries potential risks and complications:

Wound infection or infection of the implanted material
Nerve injuries (in particular to the sural nerve or the peroneal nerve)
Vascular injuries
Implant failure or loosening
Non-union (failure of bone healing)
Post-traumatic arthritis of the ankle joint if the articular surface is not accurately restored

Prognosis

With correct surgical treatment and consistent rehabilitation, the prognosis of Volkmann triangle fixation is favorable in many cases. Key factors for a good long-term outcome include anatomically accurate restoration of the joint surface, stability of the fixation, and early and consistent physiotherapy. Nevertheless, there is an increased risk of developing ankle osteoarthritis (degenerative joint disease) in the long term.

References

Müller M.E. et al. – AO Principles of Fracture Management. Thieme Publishing, Stuttgart, 2021.
Rammelt S., Zwipp H. – Fractures and Dislocations of the Foot and Ankle. In: Wirth C.J. (Ed.): Practice of Orthopaedics and Trauma Surgery. Thieme Publishing, Stuttgart, 2014.
Verhage S.M. et al. – Posterior Malleolus Fractures: A Growing Awareness. Bone & Joint Journal, 2019. Available via PubMed (PMID: 31079507).

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