Hip (Dunn view)
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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.
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The Dunn view is the preferred projection to aid in the diagnosis of femoroacetabular 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 the tabletop)
- the hip joint is flexed 90° and abducted 20° while the pelvis remains in neutral rotation
- AP projection
- the 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 is 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 is hard to achieve, this is known as the modified Dunn view 1,2.
- 1. Clohisy JC, Carlisle JC, Beaulé PE, Kim YJ, Trousdale RT, Sierra RJ, Leunig M, Schoenecker PL, Millis MB. A systematic approach to the plain radiographic evaluation of the young adult hip. (2008) The Journal of bone and joint surgery. American volume. 90 Suppl 4: 47-66. doi:10.2106/JBJS.H.00756 - Pubmed
- 2. Garbuz DS, Masri BA, Haddad F, Duncan CP. Clinical and radiographic assessment of the young adult with symptomatic hip dysplasia. (2004) Clinical orthopaedics and related research. doi:10.1097/00003086-200401000-00004 - Pubmed
- 3. Nader A. Nassif, John C. Clohisy. Combined Techniques in FAI: Hip Arthroscopy Followed by Mini-Anterior Approach. (2020) doi:10.1007/978-3-642-22769-1_17