Isolated talonavicular arthrodesis in patients with rheumatoid arthritis of the foot and tibialis posterior tendon dysfunction
- Stanislav Popelka1Email author,
- Rastislav Hromádka†1, 2,
- Pavel Vavřík†1,
- Pavel Štursa†3,
- David Pokorný†1,
- David Jahoda†1 and
- Antonín Sosna†1
© Popelka et al; licensee BioMed Central Ltd. 2010
Received: 11 March 2009
Accepted: 27 February 2010
Published: 27 February 2010
The foot is often affected in patients with rheumatoid arthritis. Subtalar joints are involved more frequently than ankle joints. Deformities of subtalar joints often lead to painful flatfoot and valgus deformity of the heel. Major contributors to the early development of foot deformities include talonavicular joint destruction and tibialis posterior tendon dysfunction, mainly due to its rupture.
Between 2002 and 2005 we performed isolated talonavicular arthrodesis in 26 patients; twenty women and six men. Tibialis posterior tendon dysfunction was diagnosed preoperatively by physical examination and by MRI. Talonavicular fusion was achieved via screws in eight patients, memory staples in twelve patients and a combination of screws and memory staples in six cases. The average duration of immobilization after the surgery was four weeks, followed by rehabilitation. Full weight bearing was allowed two to three months after surgery.
The mean age of the group at the time of the surgery was 43.6 years. MRI examination revealed a torn tendon in nine cases with no significant destruction of the talonavicular joint seen on X-rays. Mean of postoperative followup was 4.5 years (3 to 7 years). The mean of AOFAS Hindfoot score improved from 48.2 preoperatively to 88.6 points at the last postoperative followup. Eighteen patients had excellent results (none, mild occasional pain), six patients had moderate pain of the foot and two patients had severe pain in evaluation with the score. Complications included superficial wound infections in two patients and a nonunion developed in one case.
Early isolated talonavicular arthrodesis provides excellent pain relief and prevents further progression of the foot deformities in patients with rheumatoid arthritis and tibialis posterior tendon dysfunction.
Major contributors to the early development of foot deformities include talonavicular joint destruction and tibialis posterior tendon dysfunction [1, 3–5]. The tendon can be affected by a rheumatic process that may lead to its partial or complete rupture [6, 7]. In this study we provide results after talonavicular arthrodesis in patients with rheumatoid arthritis and dysfunction of the tibialis posterior tendon.
Between 2002 and 2005 we performed isolated talonavicular arthrodesis in 26 patients with rheumatoid arthritis (twenty women and six men) at the Orthopaedic Clinic of the 1st Faculty of Medicine Charles University in Prague, Motol Teaching Hospital, Czech Republic. The study was permitted by an appropriate Ethics Committee for Multi-Centric Clinical Trials of the Motol Teaching Hospital (reference number: EK464/09). All patients in the study had planovalgus deformity and complained of pain on the dorsomedial aspect of the inner margin of the foot during weight bearing.
All patients underwent physiotherapy and used individual insoles prior the surgery to release the pain of dorsomedial margin of the foot. Only patients with rheumatic destruction of the talonavicular joint and present of the pain were operated from the medial longitudinal approach at the level of the talonavicular joint. After opening the capsule of the joint we removed the remainder of cartilage from the head of the talus and naviculare bone with a shaver and chisel. In every case we revised the tibialis posterior tendon. In case of an intact tendon and the presence of synovitis, a synovectomy of the sheath was performed. When a tendon tear was found it was not possible to conduct a suture of the tendon due to the significant shortening and destruction of the remainder of the tendon. After tendon revision we reduced the space between the bones and fixed with various types of osteosynthesis (two screws, two memory staples or combination of screw and memory staple).
Following surgery a splint was applied for four to six weeks. Physical therapy followed removal of the splint (soft tissue techniques, exercises, hydrotherapy). Initially ambulation was with partial weight progressing to full weight bearing two to three months post-surgery. Patients were followed clinically and radiographically at regular intervals (one-week, six-week, three-month, six-month, one-year, two-years, etc.) after the procedure. Using standard radiographs (AP and oblique view) we evaluated the healing process of arthrodesis and the position of the ostheosynthesis. The arthrodesis had to be fused on three-month followup in both projections. We focused not only on the talonavicular joint, but additionally on whether the arthritis had spread to other foot joints and whether the deformity of the foot had progressed. We used AOFAS Hindfoot score  for evaluation subjective and objective findings.
We assessed the patients in 2008, after a longer time period had elapsed since their operations. The average age of patients at the time of the surgery was 43.6 years. The right foot was operated on in fifteen cases and the left foot in eleven.
Signs of arthritis of the talonavicular joint were visible on the X-rays in 13 cases, while in the other 13 cases the talonavicular joint showed minimal destruction prior to surgery. We found torn tibialis posterior tendons in nine patients on MRI.
During the surgery, we found complete ruptures of the tibialis posterior tendon in nine cases, and in seven cases the tendon was significantly weakened and affected by the rheumatic process. The tendon showed no signs of impairment in the remaining ten cases. The rupture was always close to the tendon insertion on the naviculare bone as was previously published . Two screws in eight cases; two memory staples (DePuy) in twelve cases and a combination of screw and memory staples in six cases (DePuy) were used to stabilize the arthrodesis.
Mean followup was 4.5 years (range, 3 to 7 years). AOFAS Hindfoot score  improved from 48.2 points preoperatively to 88.6 points at the last postoperative followup. Eighteen patients had excellent results (none, mild occasional pain), six patients had moderate pain of the foot and two patients had severe pain. We found union of the arthrodesis on radiographs in all cases except one case at six-month followup. The nonunion developed in the case, when the arthrodesis was fixed by two screws.
In two cases other joints, namely the talocalcaneal and calcaneocuboid joints, were affected at three and six years after surgery, respectively. Complications included superficial wound infections in two patients, treated successfully with oral antibiotics.
The foot is often affected in patients with rheumatoid arthritis, as stated by many authors [2, 4, 16–18]. Sometimes, this can be the first sign of the disease. The early symptoms include pain and gradual development of forefoot deformity.
In patients with rheumatoid arthritis the talonavicular joint is often the first joint affected. Many authors [2–5, 19, 20] published good results with isolated talonavicular arthrodesis in patients with rheumatoid arthritis. They quote excellent results in 95% of the cases when patients had no subjective problems and the foot was in a satisfactory position. Overall subjective satisfaction of patients in our study was 92.3%, which correlated with prior studies [2, 4] and only two patients reported severe foot pain (7.7%).
We found a complete rupture of the tibialis posterior tendon in nine patients on MRI and during the operation. During clinical examination of these patients, signs of dysfunction of the tibialis posterior tendon were present [8, 9, 13, 18, 23, 24]. In all these cases, the talonavicular joint capsule was significantly disengaged.
Elboar et al.  also assessed the effects of this isolated arthrodesis on the development of changes in other joints of the foot. They did not find any relation between talonavicular joint arthrodesis and progression of changes in the other joints of the foot. In our set of patients we recorded the progression of deformities and changes in surrounding joints in two patients (three and six years after the operation). Subtalar joint arthrodesis is planned in both cases.
Early isolated talonavicular arthrodesis prevents further deviations of the forefoot and deformities of other joints. It is necessary to perform it in the early stages, while the deformity is flexible and the foot can be returned to the neutral position. In case of a fixed deformity, a triple-desis of the subtalar joint is necessary . Using cadaver specimens, Suckel et al. [25, 26] measured pressure distribution in the ankle joint after triple-desis and talonavicular arthrodesis. After triple-desis, pressure in the ankle joint increases. This may lead to the development of its degenerative changes and further destruction of all joints of the foot.
According to the literature, pseudoarthrosis occurs in 3-5% [2, 4]. Development of pseudoarthrosis is more frequent in the case of talonavicular arthrodesis than in the case of talocalcaneal arthrodesis. In talocalcaneal arthrodesis the removed surface is larger and it is perpendicular to the load direction. On the contrary, in the talonavicular joint the articulation is different - the contact surface is much small with less favorable shearing forces present. In our set of patients we recorded only one case of pseudoarthrosis (3.8%).
Isolated talonavicular arthrodesis is an effective method of treatment of talonavicular arthritis regarding pain relief and functional improvement. Early fusion of the talonavicular joint appears to prevent further progression of foot deformities. In nine patients in our cohort we encountered rupture of the tibialis posterior muscle tendon. This decreases the biomechanical stability of the talonavicular joint while increasing the shear load of the joint and destabilizing the Chopart's joint.
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