Female sex as a negative predictor of outcomes of ankle arthrodesis: a retrospective comparative monocentric study.

ABSTRACT

BACKGROUND: End-stage post-traumatic osteoarthritis of the ankle joint may require arthrodesis if conservative treatment fails and a decision against total ankle replacement is made. We aimed to compare the sex-specific differences in outcomes and objectify them using validated specific scores. METHODS: Between 2010 and 2021, 221 patients underwent ankle arthrodesis at our institution, including 143 men (MAA) and 78 women (FAA). In addition to demographic data, the aetiology of osteoarthritis, the Foot Function Index (FFI-D), the Olerud-Molander Score (OMAS), and the Short Form-12 questionnaire (SF-12) were collected in this monocentric study. The mean follow-up time was 5.8 years. End-stage osteoarthritis was mostly due to ankle fractures as a result of sprains, falls, and road traffic accidents. RESULTS: Post-operatively, the mean FFI-D for pain was 17.3 (MAA 14.7; FAA 22.2) and 43.9 for function (MAA 41.1; FAA 49.5); the mean OMAS was 58.2; and the mean SF-12 physical component score was 42.5. Women achieved significantly worse results in all scores; only the mental component summary of the SF-12 did not differ between the sexes (p > 0.05). Approximately 34% of women stated that the result in terms of gait pattern was worse than expected (MAA 16.1%; p < 0.05). Again, significantly more men stated that the result was better than expected (MAA 48.3%; FAA 31.5%, p < 0.05). CONCLUSIONS: The fact that the clinical results were significantly worse in women after ankle arthrodesis should be considered when determining the indication. However, the expectations of men and women also need to be individually adjusted.