Abstract
Non-operative treatment methods of idiopathic clubfoot have become increasingly accepted worldwide as the initial standard of care. The Ponseti method has become particularly popular due to published short and long term success rates in North America. The purpose of the current study was to examine the early rate of relapse in a New Zealand population and analyze patient characteristics for factors predictive of relapse.
Fifty-one consecutive babies with seventy-eight club-feet treated by the Ponseti technique were followed prospectively for a minimum of two years from the start of treatment. Recurrence, defined as the need for any operative intervention, was analyzed with respect to severity at presentation, timing of presentation, the number of casts needed to obtain correction, family history of clubfoot, ethnicity, and compliance with abduction bracing. Recurrence was subdivided into minor recurrences, defined as a tendon transfer or Achilles lengthening, and major recurrences, defined as a full posterior or posteromedial release.
Twenty patients (39%) had a recurrence. Eleven patients (22%) had a major recurrence and nine patients (17%) had a minor recurrence. Only three of twenty-five patients (12%) who were compliant with bracing had a major recurrence. Twenty-five of fifty-one patients (49%) were compliant with bracing. The greatest risk factor for recurrence was non compliance with abduction bracing, with an odds ration of 5 (p = 0.009). Although not quite statistically significant (p = .07), ethnicity was also related to recurrence, with Polynesian patients being three times less likely than white Europeans to recur. No statistically significant relationships were found between recurrence and severity at presentation, timing of presentation, the number of casts needed to obtain correction, or family history of clubfoot.
Compliance with abduction bracing is crucial to avoiding recurrence of clubfoot. The Polynesian club-foot seems more amenable to Ponseti technique and less likely to recur than the white European clubfoot. In those patients who are compliant, the Ponseti method is very effective at maintaining a correction, with minimal need for major surgery. However, even among the compliant patients, minor recurrences are common, and among the noncompliant patients, many major and minor recurrences should be expected.
The abstracts were prepared by Editorial Secretary Jean-Claude Theis. Correspondence should be addressed to NZOA at Department of Orthopaedic Surgery, Dunedin Hospital, Private Bag 1921, Dunedin, New Zealand.
