| Summary: | Objective
Cryoneurolysis, cold-induced reversible conduction block of peripheral nerves, is an effective treatment for reducing knee osteoarthritis (OA) symptoms and opioid use following knee arthroplasty. There are limited data concerning its use for ankle OA. Our aim was to assess clinically significant long-term symptomatic relief of ankle OA with cryoneurolysis.
Method
This single-center, open-label trial included participants aged >18 years with radiographic tibiotalar OA, unilateral ankle pain ≥5/10 on Numerical Rating Scale (NRS)), and without ankle surgery within 6-months of screening. Following ultrasound-guided cryoneurolysis of nerves in the ankle pain distribution (sural, saphenous, superficial and/or deep fibular nerves), outcomes were assessed at clinic visits (6, 12 and 24-weeks) and by telephone interview (3, 9, 18-weeks). The primary endpoint was change in Foot and Ankle Outcome Score (FAOS) (pain subscale) at 12-weeks. Change in quality of life (FAOS-QoL), activities of daily living (FAOS-ADL), pain-NRS, and physical performance measures were also assessed. Longitudinal mixed models were constructed to evaluate changes from baseline at 6, 12- and 24-weeks post-treatment.
Results
Forty participants enrolled (50% female, mean ± SD age 63.0 ± 12.8 years). At 12-weeks post treatment, FAOS-pain (20.8, p < 0.0001), ADL (18.1, p = 0.0003), QoL (19.9, p = 0.0003) and in NRS-pain (−2.6, p < 0.0001) were significantly improved. No difference in 40-m fast-paced walking test was detected at 12-weeks post-treatment (−1.2sec, p = 0.59). For all outcomes, similar findings were observed at 6- and 24-week visits.
Conclusion
Cryoneurolysis resulted in statistically significant improvements in ankle pain, physical function and QoL for up to 24-weeks in participants with unilateral, symptomatic ankle OA.
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