Meta-Analysis: Functional Outcome of ORIF Versus Primary Subtalar Arthrodesis of Sanders Type II and Type III Calcaneal Fractures

The choice of treatment for Sanders Type II and Type III calcaneal fractures remains controversial with unclear patient functional outcomes. A meta-analysis was done to compare the functional outcome of ORIF vs primary subtalar arthrodesis (PSA) according to American Orthopedic Foot and Ankle Score (AOFAS) hindfoot-ankle scores. The PubMed, Embase, and Cochrane Library Databases were searched by two independent evaluators. Fourteen studies met the eligible criteria. ORIF of 501 Type II and Type III fractures was compared to primary subtalar arthrodesis treatment of 57 Type II and Type III fractures. AOFAS for a mixed ORIF group of “Type II and III” fractures was 82.16 ± 1.58 at average follow-up of 25.3 months. For a mixed PSA group of “Type II and III” fractures, the AOFAS was 74.22 ± 2.45 at average follow-up of 28.0 months. This showed a difference between ORIF and primary subtalar arthrodesis of 7.94 points (95% confidence interval CI] = 7.75–7.98; p value .004) favoring ORIF when adjusting for minimally invasive and percutaneous methods. Without adjustment, there was a difference of 6.54 points favoring ORIF (95% CI = 6.22–6.46; p value .017). In conclusion, while high-quality randomized controlled trials comparing ORIF to primary subtalar arthrodesis for Type II and Type III fractures would further elucidate superior treatment outcomes, this meta-analysis of available data shows a tendency for ORIF of Type II and Type III Sanders calcaneal fractures to have a better functional outcome at approximately 2 years postoperatively compared to primary subtalar arthrodesis.