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Citation:
azimi m, Jones J, Pubofemoral Distance. Reference article, Radiopaedia.org (Accessed on 29 Mar 2024) https://doi.org/10.53347/rID-168100
The Pubofemoral distance (PFD) is a measurement used to detect hip instability and avoid the late diagnosis of developmental dysplasia of the hip. It is a reproducible and straightforward sonographic screening test that measures the distance between the medial margin of the epiphysis and the pubic bone 4.
A pubofemoral distance greater than 6 mm (at the age of 1 month) or a difference greater than 1.5 mm should trigger referral 1.
While PFD measurement is accurate for diagnosing DDH, it should not be considered a replacement for the Graf method due to its low-positive predictive value 2.
The pubofemoral distance increases with age but is not significantly influenced by laterality or gender. This means that it can be used as the follow-up of infants treated for DDH 3.
The pubofemoral distance is a valuable tool for detecting hip instability and preventing potential complications, allowing for early intervention and treatment.
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1. Tréguier C, Chapuis M, Branger B et al. Pubo-Femoral Distance: An Easy Sonographic Screening Test to Avoid Late Diagnosis of Developmental Dysplasia of the Hip. Eur Radiol. 2013;23(3):836-44. doi:10.1007/s00330-012-2635-7 - Pubmed
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2. Motta G, Chiovatto A, Chiovatto E et al. Measurement of Pubofemoral Distance in the Diagnosis of Developmental Dysplasia of the Hip: Sensitivity and Specificity. J Ultrasound Med. 2022;41(5):1205-12. doi:10.1002/jum.15811 - Pubmed
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3. Ban Y, Luan Q, Shi M et al. Establishing Reference Values for the Pubofemoral Distance in Normal Infant Medial Hips by Ultrasound. Acta Radiol. 2021;62(4):551-6. doi:10.1177/0284185120933240 - Pubmed
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4. Essential Measurements in Pediatric Musculoskeletal Imaging. SpringerLink. 2023. doi:10.1007/978-3-031-17735-4
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