Abstract

IntroductionNail patella syndrome is a rare autosomal dominant hereditary condition, with an incidence of 22 per million in the United Kingdom. The syndrome’s most common features include iliac horns, hypoplastic patella and nail dysplasia.Case presentationWe report the case of a 26-year-old Caucasian man with nail patella syndrome who sustained a fracture of his right hypoplastic patella after a fall. His right knee became swollen and he was unable to extend against gravity immediately post fall. Radiographs revealed a fracture of the lower pole of his right patella with associated complete disruption of the extensor mechanism of the knee. He underwent operative fixation and his post operative course was uneventful. He was further treated post operatively with a full knee cast and graded immobilization. At six months he had regained the full range of motion at the knee joint.ConclusionsTo the best of our knowledge, this is the only case report in the literature describing a patella fracture in an individual with nail patella syndrome. We hypothesize that given the extent of pre-existing knee joint impairment in these individuals, functional outcome may be inferior, suggesting the need for more frequent follow-up.

Highlights

  • Nail patella syndrome is a rare autosomal dominant hereditary condition, with an incidence of 22 per million in the United Kingdom

  • We hypothesize that given the extent of pre-existing knee joint impairment in these individuals, functional outcome may be inferior, suggesting the need for more frequent follow-up

  • We present the case of 26-yearold man with this condition who sustained a patella fracture

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Summary

Conclusions

While NPS is a relatively rare condition, it has been extensively studied with follow up periods of up to 55 years [8]. We believe the injury we present of a patella fracture in an individual with this condition is the first case of its kind to be reported in the literature. Consent Written informed consent was obtained from the patient for publication of this case report and any accompanying images. Competing interests The authors declare that they have no competing interests. Authors’ contributions SCON analyzed and interpreted the patient data and wrote the manuscript. CGM contributed the surgical section of the manuscript and aided in the editorial process. JPMcE contributed to the preparation and aided in the editorial process. All authors read and approved the final manuscript

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Roeckerath W

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