[Tibiotalocalcaneal arthrodesis using a retrograde nail locked in the sagittal plane]

To evaluate our experience with the use of a retrograde nail locked in the sagittal plane for tibiotalocalcaneal arthrodesis indicated in severe post-traumatic arthritis of the ankle.

Twenty patients, 16 men and four women at an average age of 58.7 years (range, 23 to 72) were evaluated. All patients had severe post-traumatic changes in the talocrural and talocalcaneal joints. Five patients also had an equinus deformity. In two patients arthrodesis followed the treatment of purulent arthritis of the talocrural joint. A local fasciocutaneous flap was used for soft tissue reconstruction in three patients. All patients were operated on using the standard surgical technique. METHODS With the patient in a supine position, reamed by hand with the use of a driving rod, a straight retrograde AAN Orthofix nail was inserted through the heel bone and talus into the distal tibia and locked in these bones in the sagittal plane.

No complications such as injury to the neurovascular plexus or pseudoarthrosis were recorded. Four patients showed a reaction to the proximal locking screw on the proximal tibial surface, which was treated by earlier screw removal under topical anaesthesia. Due to infectious complications, the nail had to be removed prematurely in one patient. The average Foot Function Index was 12 points (range, 10 to 15) and the average ankle-hindfoot score was 67.6 points (range, 59 to 84). Thirteen patients (65 %) were not limited in their daily activities or recreational sports, six (30 %) experienced pain in sports but not daily activities and one patient (5 %) reported pain even when walking. All fusions healed in the correct position within 18 weeks.

Tibiotalocalcaneal arthrodesis is not a frequent surgical procedure in either trauma surgery or orthopaedics. For this complicated procedure, rather than intramedullary nails, internal fixation with screws or plates or external fixation are preferred. The high rate of bony healing can be explained by maintenance of exact nail locking in the sagittal plane. The antero- posterior approach provides a more secure locking in the bone and assists in neutralizing sagittal forces at the site of arthrodesis. The use of reamed interlocking nails can therefore be accepted not only for treatment of long-bone fractures, but also for treating pseudoarthrosis and in complicated or failed arthrodesis.

Patients' satisfaction is the primary goal we strive to achieve in severe post-traumatic conditions of the talus and foot. Repeat surgery, spongioplasty, external fixation revision for pin-tract infection, persistent pain, activity restriction and poor clinical results reduce patients' satisfaction. In our group, the rate of healed arthrodesis was high and the number of complications was low, therefore our patients' satisfaction was high.