RSNA 2003 

Abstract Archives of the RSNA, 2003


538-p

Three-dimensional CT Analysis for Acetabulum Morphology in Developmental Dysplasia of Hip

Scientific Posters

Presented on December 3, 2003
Presented as part of L13: Pediatric Pediatric Musculoskeletal

Participants

Wang Yan, PRESENTER: Nothing to Disclose

Abstract: HTML Purpose: To evaluate the use of 3DCT in acetabulum morphological analyze in patients with developmental dysplasia of hip. Methods and Materials: 173 cases of DDH diagnosed by clinics and plain films were scanned on spiral CT, aging from 5 month to 18 years old. Bilateral DDH was found in 103 cases. Within the 70 cases of unilateral DDH, 46 were left-sided. All together there are 276 abnormal hips.All the CT scan were performed on General Electric Lightspeed 4-slice spiral CT scanner. Low-dose scanning was performed with 120KV, 100-120MA according to patient size from the top of hip joint to the less trochanter. After 2.5 mm contiguous slices with 2.5 mm interval space were obtained, Surface-shade reconstruction was made to observe the morphology of acetabula. Results: The morphology of acetabula could be divided into five types: type I: 26 hips, irregular of the roof of acetabulum; type II: 62 hips, anterior-superior deficiency; type III: 94 hips, mid-superior deficiency; type IV: 60 hips, global deficiency and type V: 25 hips, groove-shaped lateral acetabula displasia. The frequency of 5 types of acetabulum in the four subgroups is as follow: Within untreated group (group A), there are 98 cases, 159 abnormal hips. Group A can be subdivided into A1 (dysplastic, 89 hips) and A2 (dislocation, 70 hips) groups. A1: Type I, 13 hips, 15percent. Type II 18 hips, 20percent. Type III 30 hips, 34percent. Type IV 10 hips, 11percent and type V 11 hips, 12percent. A2: Type I, 5 hips, 7percent. Type II 18 hips, 26percent. Type III 20 hips, 29percent. Type IV 21 hips, 30% and type V 4 hips, 6percent. Within treated group (group B), there are 75 cases, 117 abnormal hips. Group B can be subdivided into (non-surgical, 22 hips) and B2 (surgical treatment, 95 hips) groups. B1: Type I, 1 hips, 0.5percent. Type II 3 hips, 14percent. Type III 8 hips, 36percent. Type IV 9 hips, 41percent and type V 1 hips, 0.5percent. B2: Type I, 7 hips, 7percent. Type II 23 hips, 24percent. Type III 36 hips, 38percent. Type IV 20 hips, 21percent and type V 9 hips, 9percent. Conclusion: 3DCT can reveal the shape and development of acetabula. It can help to determine the further orthopedic treatment of the patients.       Questions about this event email: tony.lu@geahk.ge.com

Cite This Abstract

Yan, W, Three-dimensional CT Analysis for Acetabulum Morphology in Developmental Dysplasia of Hip.  Radiological Society of North America 2003 Scientific Assembly and Annual Meeting, November 30 - December 5, 2003 ,Chicago IL. http://archive.rsna.org/2003/3104345.html