Triple Arthrodesis
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A triple arthrodesis consists of the surgical fusion of the talocalcaneal (TC), talonavicular (TN), and calcaneocuboid (CC) joints in the foot. The primary goals of a triple arthrodesis are to relieve pain from arthritic, deformed, or unstable joints. Other important goals are the correction of deformity and the creation of a stable, balanced plantigrade foot for ambulation.
Edwin W Ryerson first described triple arthrodesis in 1923 as a fusion of the TC, TN, and CC joints. [1] The aim was to create a well-aligned, plantigrade, and stable foot that would allow patients with paralytic or deforming conditions to function better. The most common indications were to correct lower extremity deformities in children resulting from poliomyelitis, cerebral palsy, Charcot-Marie-Tooth disease, clubfoot, or tuberculosis.
The original procedures were performed by removing large blocks of subchondral bone and correcting the angular deformities by inserting or removing wedges. The corrections were maintained by casting that often required later manipulation for loss of position. Kirschner wires (K-wires), Steinmann pins, and staples were used over time to hold the corrections in place but are now not as common.
Internal fixation with various compression screws using the Arbeitsgemeinschaft für Osteosynthesefragen (AO) technique and specially designed plating systems has become the standard of care.
For patient education resources, see the Foot, Ankle, Knee, and Hip Center and Arthritis Center, as well as Rheumatoid Arthritis.
Triple arthrodesis should be considered a salvage procedure and should be employed only after other conservative treatment modalities have been exhausted. The primary goals are to abolish pain, correct underlying deformity, and restore a stable platform for ambulation. In conditions where a lesser fusion or soft-tissue procedure will suffice, triple arthrodesis should not be used, because of the potential long-term complications associated with it. The primary indications for the procedure are as follows [2] :
The use of triple arthrodesis to treat Mueller-Weiss disease has also been described. [3]
Contraindications for triple arthrodesis include conditions that can be adequately corrected and maintained via external bracing, soft-tissue procedures, tendon balancing, or lesser fusions. Chronic smoking is a relative contraindication because of the associated high incidence of nonunion.
The bony anatomy consists of the talus, calcaneus, cuboid, and navicular. The talus and calcaneus make up the TC joint (also referred to as the subtalar joint). Its articular portion is composed of the more important posterior facets of the talus and calcaneus and the smaller anterior and middle facets. The anterior talofibular, posterior talofibular, calcaneofibular, deltoid, and interosseous TC ligaments stabilize it.
Subtalar motion is triplanar and is described appropriately as pronation (dorsiflexion, eversion, and external rotation) and supination (plantarflexion, inversion, and internal rotation). Clinically, however, most motion takes place in the frontal plane and is seen as heel eversion and inversion. Although normal range-of-motion (ROM) values are difficult to measure, a practical rule of thumb is 30° of total motion with approximately 10° of inversion and 20° of eversion.
The sinus tarsi is a tunnellike structure extending from distal lateral to posterior medial in the rearfoot. It is formed dorsally by the concavity in the neck of the talus and plantarly by the sulcus between the posterior facet and sustentaculum tali of the calcaneus. This structure is widest laterally and contains the bifurcate, cervical, and interosseous ligaments. It is filled by a fatty plug known as the Hoke tonsil and serves as the origin of the extensor digitorum brevis (EDB).
The head of the talus and the navicular constitute the TN joint. This is a condylar joint. The head of the talus is convex, and the corresponding surface of the navicular is concave. This is an important spatial relation to understand because the navicular forms a lip around a portion of the talar head, making it difficult to fully access the joint and remove adequate amounts of cartilage.
Normally, during stance phase, the calcaneus everts, and the talus plantarflexes and internally rotates. This action produces a relative dorsiflexion, eversion, and abduction of the navicular, which subsequently translates that motion to the forefoot. In excessive or pathologic cases, this presents as medial arch collapse with forefoot abduction. The opposite takes place with weightbearing TC joint supination.
The anterior articular portion of the calcaneus and cuboid make up the CC joint. This is often the first joint resected during a triple arthrodesis and is the most easily accessible of the three joints. Directly superior to the joint is the EDB muscle belly, and lateral to it are the peroneal tendons.
The sural nerve courses along the lateral side of the foot, and the superficial peroneal nerve takes a more dorsal lateral position. It should be noted that there is significant anatomic variation of the sural nerve, and care must be exercised in making the incision. The lateral incision is placed between these two nerves. The saphenous nerve and vein enter the foot on the dorsal medial aspect. A medial incision is also made and is usually located in line with and just plantar to these structures.
For more information about the relevant anatomy, see Foot Bone Anatomy and Ankle Joint Anatomy.
Presentations in the clinic can vary, depending on the underlying pathology. A common feature of patients is the development of DJD. Conditions that produce an improperly functioning, unstable foot that leads to DJD are the main indications for surgical treatment.
TC joint arthritis usually manifests as pain located anterior to the distal tip of the fibula in the region of the sinus tarsi. The pain is exacerbated with forced inversion and eversion of the heel. In advanced cases, crepitation is noted with forced ROM. Similar findings can be seen in the CC and TN joints. Pain is usually elicited with periarticular palpation.
Depending on the underlying pathology, the patient may present with a varus or valgus deformity. Posttraumatic arthritis often presents with a rectus foot and complaints consistent with DJD of the TC joint. It commonly occurs after calcaneal fractures with posterior facet involvement.
Depending on the severity of the fracture, the heel can be shortened, can be widened, and can have an uneven lateral wall with bony prominences (see the images below). These findings are typically seen in lateral wall blowout fractures that do not undergo open reduction with internal fixation (ORIF). Similar fractures with inadequate ORIF, or inadequate reduction, leaving a varus or valgus deformity, can also be seen in these cases.
Valgus deformities are commonly seen in collapsing pes planovalgus, late-stage tibialis posterior tendon dysfunction, tarsal coalition, and some neuromuscular conditions. They are easy to identify, especially in the latter stages of the deformity, and present with a heel in valgus, an abducted forefoot, and a medial arch that is typically collapsed (see the images below).
Varus foot deformities are seen in cavus foot types, cavovarus foot types, talipes equinovarus, and some neuromuscular conditions. The most common neuromuscular condition presenting with a varus deformity is Charcot-Marie-Tooth disease (see the images below). This deformity is also fairly easy to identify. The patient will have a heel that is in a varus position, an adducted forefoot, a higher-than-normal arch, and ankles that are storklike.
Outcomes are typically good, with high union rates of the TC and CC joints. The TN joint has the highest incidence of nonunion; however, the nonunion rate decreases with better understanding of the procedure and stable fixation. Degenerative changes at the unfused distal and proximal joints are still a long-term complication, but this is true with any fusion procedure. A study examining 400 triple arthrodesis procedures found less-than-perfect results in 24.5% of patients.
Up to 10 months are required for the patient to become pain-free. Return to high-impact activity is not a given. Lower-impact activities like walking, cycling, and swimming should be obtainable goals postoperatively.
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Stephen M Schroeder, DPM, FACFAS Foot and Ankle Surgeon, Sports Medicine Oregon
Stephen M Schroeder, DPM, FACFAS is a member of the following medical societies: American College of Foot and Ankle Surgeons
Disclosure: Nothing to disclose.
Enzo Sella, MD Chief, Orthopedic Foot and Ankle Surgery, Yale-New Haven Hospital; Associate Clinical Professor, Department of Orthopedics and Rehabilitation, Yale University School of Medicine
Enzo Sella, MD is a member of the following medical societies: American Academy of Orthopaedic Surgeons, American Orthopaedic Foot and Ankle Society, Eastern Orthopaedic Association, North American Spine Society, Academy of Medical Royal Colleges
Disclosure: Nothing to disclose.
Peter A Blume, DPM, FACFAS Assistant Clinical Professor of Surgery, Department of Surgery, Yale University School of Medicine; Assistant Clinical Professor of Orthopedics and Rehabilitation, Department of Orthopedics and Rehabilitation, Section of Podiatric Surgery, Yale University School of Medicine
Peter A Blume, DPM, FACFAS is a member of the following medical societies: American Association of Hospital and Healthcare Podiatrists, American College of Foot and Ankle Surgeons, American Podiatric Medical Association, International College of Angiology, American Diabetes Association
Disclosure: Nothing to disclose.
Raymond O’Hara, DPM Chief Resident, Department of Orthopedic Surgery, Yale-New Haven Hospital
Disclosure: Nothing to disclose.
Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference
Disclosure: Received salary from Medscape for employment. for: Medscape.
Jeffrey D Thomson, MD Professor of Orthopedic Surgery, University of Connecticut School of Medicine; Director of Orthopedic Surgery, Connecticut Children’s Medical Center; Vice President of Medical Staff, Connecticut Children’s Medical Center
Jeffrey D Thomson, MD is a member of the following medical societies: American Academy of Orthopaedic Surgeons, Pediatric Orthopaedic Society of North America, Scoliosis Research Society
Disclosure: Nothing to disclose.
Heidi M Stephens, MD, MBA Associate Professor, Department of Surgery, Division of Orthopedic Surgery, University of South Florida College of Medicine; Courtesy Joint Associate Professor, Department of Environmental and Occupational Health, University of South Florida College of Public Health
Heidi M Stephens, MD, MBA is a member of the following medical societies: Alpha Omega Alpha, American Academy of Orthopaedic Surgeons, American Medical Association, American Orthopaedic Foot and Ankle Society, Florida Medical Association
Disclosure: Nothing to disclose.
Triple Arthrodesis
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