Arthroscopic resection of calcaneonavicular coalition/malunion via a modified sinus tarsi approach: An early case series

BackgroundCalcaneonavicular coalition represents abnormal coalescence between calcaneus and navicular bone. It is a congenital anomaly, sometimes becoming symptomatic in young adolescent. This is managed conservatively initially, failing which surgical excision, open or arthroscopic, is considered. We present our arthroscopic technique via a modified sinus tarsi approach, with early results in two adolescent and two young adult patients.MethodThe patient is placed in a 45° “saggy” lateral position, and entry points for portals are marked around sinus tarsi area. The adequacy of resection is checked with image intensifier at the end of procedure. Patients complete subjective scoring forms, Manchester–Oxford Foot Questionnaire and Visual Analogue Scale, pre operatively and at follow-ups. Paired t test was performed to assess statistical significance.ResultsThe results of early follow-up of these patients have confirmed complete excision, non-recurrence and symptomatic improvement. The mean difference in MOXFQ scores pre and post surgery is 39.33, with a two-tailed p value of 0.0187. Similarly, the mean difference in VAS score is 5.67 with a two-tailed p value of 0.0034. These are statistically significant and confirm symptomatic improvement at an early follow-up.ConclusionThe arthroscopic technique provides better access allowing wide excision and causes minimal soft tissue trauma leading to early recovery and mobilisation.