Objectives: Total ankle replacement (TAR) is increasingly used for treatment of primary or posttraumatic arthritis of the ankle joint, if joint movement is intended to be preserved. Data on characteristics and treatment of ankle prosthetic joint infection (PJI) is limited and no validated therapeutic algorithm exist. Therefore, we analyzed all infections, which occurred in a cohort of implanted ankle prostheses during a 5-year-period.

Methods: Between 06/2004 and 12/2008, all patients with an implanted ankle prosthesis at our institution were retrospectively reviewed. All patients were operated by the same surgical team. Ankle PJI was defined as visible purulence, acute inflammation on histopathology, sinus tract, or microbial growth in periprosthetic tissue or sonication fluid of the removed prosthesis. The surgery on the infected ankle prosthesis and the follow-up were performed by the surgical team, who implanted the prosthesis. A specialized septic team consisting of an orthopaedic surgeon and infectious diseases consultant were included in the treatment.

Results: During the study period, 92 total ankle prostheses were implanted in 90 patients (mean age 61 years, range 28–80 years). 78 patients had posttraumatic arthritis, 11 rheumatoid arthritis and 3 other degenerative disorder. Ankle PJI occurred in 3 of 92 TAR (3.3%), occurring 1, 2 and 24 months after implantation; the causative organisms were Enterobacter cloacae, Streptococcus pyogenes and Staphylococcus epidermidis, respectively. The ankle prosthesis was removed in all infected patients, including debridement of the surrounding tissue was debrided and insertion of an antibiotic loaded spacer. Provisional arthrodesis was performed by external fixation in two patients and by plaster cast in one. A definitive ankle arthrodesis with a retrograde nail was performed 6 to 8 weeks after prosthesis removal. One patient needed a flap coverage. All 3 patients received intravenous antibiotic treatment for 2 weeks, followed by oral antibiotics for 4–6 weeks. At follow-up visit up to 18 months after start of treatment, all patients were without clinical or laboratory signs of infection.

Conclusions: The infection incidence after TAR was 3.3%, which is slightly higher than reported after hip (< 1%) or knee arthroplasty (< 2%). A two-step approach consisting of removal of the infected prosthesis, combined with local and systemic antibiotic treatment, followed by definitive ankle arthrodesis shows good results. Larger patient cohort and longer follow-up evaluation is needed to define the optimal treatment approach for ankle PJI.

Introduction: Ankle arthropathy is associated with a decreased motion of the ankle-hindfoot during ambulation. Ankle arthrodesis was shown to result in degeneration of the neighbour joints of the foot. Inversely, total ankle arthroplasty conceptually preserves the adjacent joints because of the residual mobility of the ankle but this has not been demonstrated yet in vivo. It has also been reported that degenerative ankle diseases, and even arthrodesis, do not result in alteration of the knee and hip joints. We present the preliminary results of a new approach of this problem based on ambulatory gait analysis.

Patients and Methods: Motion analysis of the lower limbs was performed using a Physilog® (BioAGM, CH) system consisting of three-dimensional (3D) accelerometer and gyroscope, coupled to a magnetic system (Liberty©, Polhemus, USA). Both systems have been validated. Three groups of two patients were included into this pilot study and compared to healthy subjects (controls) during level walking: patients with ankle osteoarthritis (group 1), patients treated by ankle arthrodesis (group 2), patients treated by total ankle prosthesis (group 3).

Results: Motion patterns of all analyzed joints over more than 20 gait cycles in each subject were highly repeatable. Motion amplitude of the ankle-hindfoot in control patients was similar to recently reported results. Ankle arthrodesis limited the motion of the ankle-hindfoot in the sagittal and horizontal planes. The prosthetic ankle allowed a more physiologic movement in the sagittal plane only. Ankle arthritis and its treatments did not influence the range of motion of the knee and hip joint during stance phase, excepted for a slight decrease of the hip flexion in groups 1 and 2.

Conclusion: The reliability of the system was shown by the repeatability of the consecutive measurements. The results of this preliminary study were similar to those obtained through laboratory gait analysis. However, our system has the advantage to allow ambulatory analysis of 3D kinematics of the lower limbs outside of a gait laboratory and in real life conditions. To our knowledge this is a new concept in the analysis of ankle arthropathy and its treatments. Therefore, there is a potential to address specific questions like the difficult comparison of the benefits of ankle arthroplasty versus arthrodesis. The encouraging results of this pilot study offer the perspective to analyze the consequences of ankle arthropathy and its treatments on the biomechanics of the lower limbs ambulatory, in vivo and in daily life conditions.

Introduction: The treatment of the recently ruptured Achilles tendon is still controversial. Surgical procedures are commonly considered to restore excellent functional capacity and suffer low re-rupture rates, but are potentially associated with significant complications like wound infection and paraesthesia. Recent studies report very good results with a conservative treatment in rigid casts. Our aim was to evaluate a new method of functional and conservative treatment using immobilisation in an articulated cast.

Patients and Methods: Between March 1998 and August 2005, 12 women and 45 men with an average age of 45 (24–73), underwent a functional and conservative treatment for a recently ruptured Achilles tendon. After an immobilisation with a cast in equinus for 10 days, the patients were authorised to walk with full weight-bearing, protected by a commercial orthosis (VACO®ped, OPED). The equinus angle was set at 30° plantar flexion until the end of week 3, and at 15° until the end of week 4. At the 5th week the system was unlocked to allow ankle mobilisation of 30-15-0°, and at 30-0-0° at the seventh week. The orthosis was removed after 8 weeks. All patients had follow-up examinations up to 12 months after the trauma. The first 30 patients underwent a clinical examination and muscular testing with a Cybex isokinetic dynamometer at 6 and 12 months. In June 2006 all 57 patients were contacted and received a questionnaire. Their subjective opinions of the outcome, any change in their sport activities and eventual late complications were investigated. We evaluated the questionnaire and medical records using a scoring system based on the Leppilahti Ankle Score.

Results: After one year there was not any difference in the motion of the ankle in comparison with the healthy side. There was no substantial calf amyotrophy and we found very little difference in muscular capacity. The average overall satisfaction with the outcome was 8.1 out of 10. We observed 5 complete re-ruptures (9%), 2 partial re-ruptures and 1 deep venous thrombosis complicated by pulmonary embolism. We observed few minor skin complications.

Conclusions: The present treatment resulted in good to excellent functional results in most of the cases. It requires an active participation of the patient and a systematic medical follow-up during the first 6 months. The complication rate is acceptable. We think that early ankle mobilisation in the dynamic cast promotes better functional results than a rigid immobilisation technique.

There is a place for conservative functional treatment in the acute rupture of the Achilles tendon. But prospective comparison with modern surgical techniques, like minimal invasive suture, is still required, especially in patients with high functional demand.