Outcomes of Ankle Arthroplasty with Preoperative Coronal-Plane Varus Deformity of 10º or Greater
Why this work is in the frame
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Bibliographic record
Abstract
BACKGROUND: Preoperative talar varus deformity increases the technical difficulty of total ankle replacement and is associated with an increased failure rate. Deformity of >20° has been reported to be a contraindication to arthroplasty. We determined whether clinical outcomes of total ankle replacement in patients with ankle arthritis and preoperative talar varus deformity of ≥10° were comparable with those of patients with varus deformity of <10°. METHODS: Thirty-six ankles with preoperative coronal-plane tibiotalar varus deformity of ≥10° ("varus" group) and thirty-six prospectively matched ankles with varus deformity of <10° ("neutral" group) underwent total ankle replacement. Preoperative and postoperative evaluations included AOFAS (American Orthopaedic Foot & Ankle Society) ankle-hindfoot scores, Ankle Osteoarthritis Scale (AOS) scores, Short Form (SF)-36 scores, and radiographic measurements of coronal-plane deformity. RESULTS: The cohorts were similar with respect to age, sex, operatively treated side, body mass index, and components used, and the mean duration of clinical follow-up was 34.7 months. Eighteen (50%) of the ankles in the varus group had a preoperative varus deformity of ≥20°. Patients in the varus group underwent more ancillary procedures during the index surgery to achieve a plantigrade foot. The AOFAS score improved by a mean of 57.2 points in the varus group and 51.5 points in the neutral group. The AOS pain and disability component scores decreased significantly in both groups. The improvement in AOS and SF-36 scores did not differ significantly between the groups at the time of the final follow-up. Tibiotalar deformity improved significantly toward a normal weight-bearing axis in the varus group. Thirteen ankles in the varus group and six in the neutral group underwent additional procedures at a later date. CONCLUSIONS: Satisfactory results can be achieved in patients with varus malalignment of ≥10°, which should not be considered a contraindication to total ankle replacement. Complication rates can be reduced by utilizing meticulous surgical technique and taking care to address all causes of the varus deformity, particularly through osteophyte debridement, correction of cavus deformity, and soft-tissue balancing. LEVEL OF EVIDENCE: Prognostic level I. See instructions for authors for a complete description of levels of evidence.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it