Hip (Dunn view)
The Dunn view is a radiographic projection of the hip that demonstrates and examines the hip joint, femoral head, acetabulum, and particularly the relationship of the femoral head and acetabulum.
The Dunn view is the preferred projection to aid and diagnose femoral-acetabular impingement (FAI) due to its increased sensitivity for detecting femoral head-neck asphericity.
- patient is supine with the pelvis in neutral rotation (Anterior Superior Iliac Spine equidistant from tabletop).
- the hip joint is flexed 90° and abducted 20° while the pelvis remains in neutral rotation
- AP projection
- midpoint between the anterior superior iliac spine (ASIS) and pubic symphysis
- laterally to the proximal third of the femur
- superiorly to ASIS
- inferiorly to the crease of buttock
- medially to midline
- 24 x 30 cm
- 70-80 kVp
- 20-30 mAs
- 100 cm
Image technical evaluation
- the bony pelvis is imaged from ASIS to the proximal shaft of the femur
- the obturator foramina appear open
- greater and lesser trochanter of the proximal femur are in profile
- proximal one-third of the femur is visible
- the anterior aspect of the femoral head should be demonstrated in profile.
- the Dunn view may be performed with 45° hip flexion in a neutral rotation if 90° hip flexion's hard to achieve, this is known as the modified Dunn view 1, 2
- 1. Clohisy J, Carlisle J, Beaulé P, Kim Y, Trousdale R, Sierra R et al. A Systematic Approach to the Plain Radiographic Evaluation of the Young Adult Hip. The Journal of Bone and Joint Surgery-American Volume [Internet]. 2008 [cited 21 February 2017];90(Suppl 4):47-66. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2682767/
- 2. Garbuz D, Masri B, Haddas F, Duncan C. Clinical and Radiographic Assessment of The Young Adult With Symptomatic Hip Dysplasia. Clinical Orthopaedics and Related Research. 2004;418:18-22
- 3. Nassif N, Clohisy J. Combined Techniques in FAI: Hip Arthroscopy Followed by Mini-Anterior Approach. Femoroacetabular Impingement [Internet]. 2011 [cited 22 February 2017];:159-166. Available from: https://books.google.com.au/books?id=lspBoANMJekC&pg=PA160&lpg=PA160&dq=exposure+for+dunn+view&source=bl&ots=k7h_trW-hz&sig=hn1-G_06NLnuKRvZO_M6wEME3II&hl=en&sa=X&ved=0ahUKEwiYvoSO9bTSAhVY6GMKHeGoB0IQ6AEIRjAI#v=onepage&q=exposure%20for%20dunn%20view&f=false