ArticleBMC musculoskeletal disorders2024
Management of Methicillin-Resistant Staphylococcus aureus-infected femoral nonunion during lengthening in achondroplasia using circular external fixator: a case report.
Article in BMC musculoskeletal disorders, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundAchondroplasia, the most common form of rhizomelic dwarfism, occurs in approximately 1 in 25,000 individuals. Clinical features include attenuated growth, rhizomelic limb shortening, and craniofacial abnormalities. Limb-lengthening surgery is widely employed to improve quality of life. However, reports on Methicillin-Resistant Staphylococcus aureus (MRSA) infections in femoral nonunions at lengthening sites are scarce. CASE PRESENTATION: A 15-year-old boy with achondroplasia presented with MRSA-infected femoral nonunion. Bilateral femoral lengthening had been performed at age 13 using unilateral external fixators. Following a 7 cm lengthening of the right femur, surgical site infection occurred, with MRSA detected on postoperative day 127. Despite debridement and autologous iliac bone graft with non-locking screws, nonunion persisted. Referred to our hospital at age 15, the patient underwent radical debridement until punctate bleeding appeared, and vancomycin-loaded cement beads were implanted. A circular external fixator, effective even with bone weakened by prolonged non-weight bearing, was applied. Six weeks later, further debridement and vancomycin bead replacement were performed. Final fixation included refreshing the nonunion site and placing a cancellous bone graft from the contralateral iliac bone. Bone fusion progressed, and the ring was removed 9 months post-surgery. After seven years, no recurrence of infection was noted. Although slight knee flexion limitation persisted, the patient experiences no pain while walking and has become a healthy working adult.
conclusionThis case highlights the effectiveness of radical debridement, antibiotic-loaded cement beads, autologous bone grafting, and circular external fixation in treating MRSA-induced nonunion at femoral lengthening sites in achondroplasia. Circular external fixators provide stable fixation even in cases of prolonged bone weakness.
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