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The Bone & Joint Journal
Vol. 98-B, Issue 4 | Pages 483 - 489
1 Apr 2016
Tigchelaar S Rooy JD Hannink G Koëter S van Kampen A Bongers E

Aim

Nail patella syndrome (NPS) is a skeletal dysplasia with patellofemoral dysfunction as a key symptom. We present the first in-depth radiological evaluation of the knee in a large series of NPS patients and describe the typical malformations.

Patients and Methods

Conventional radiological examination of 95 skeletally mature patients with NPS was performed. Patellar morphology was classified according to the Wiberg classification as modified by Baumgartl and Ficat criteria, and trochlear shape was classified according to the Dejour classification.