Prevalence of Hallux Rigidus in Patients With End-Stage Ankle Arthritis.

Arthritis of the foot is a significant cause of pain and disability. The prevalence of foot arthritis in adults aged ≥50 has been reported to be 17%. Of those, 25% are estimated to be radiographic arthritis of the first metatarsophalangeal joint. The purposes of this study were to (1) identify the prevalence of radiographic hallux rigidus (HR) in a population of patients with end-stage ankle arthritis relative to that reported in the general population and (2) identify associations between the presence of HR and demographic and clinical factors. A total of 870 feet in 809 subjects with end-stage ankle arthritis who underwent primary total ankle arthroplasty between November 2006 and November 2017 were included. Feet were stratified by patient age: <40, 40 to 59, 60 to 79, and ≥80 years. Etiology of ankle arthritis was classified as inflammatory, post-traumatic, primary, and other. The prevalence of HR in the study group was 72.9%. The prevalence of HR was slightly higher in patients with inflammatory arthritis (odds ratio 1.31, 95% confidence interval 0.73 to 2.32) and primary arthritis (odds ratio 1.18, 95% confidence interval 0.86 to 1.63). The prevalence of HR increased with age (p = .01). In conclusion, the prevalence of radiographic HR in a population with end-stage ankle arthritis was significantly higher relative to patients without documented comorbidities in the foot and ankle. Increasing age was associated with a higher prevalence of the disease.