Eliminating projection error of measuring Pauwels' angle in the femur neck fractures by CT plane manipulation
| Autor: | Gyu Min Kong, Gu-Hee Jung, Jae-Man Kwak |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male medicine.medical_specialty Cohort Studies 03 medical and health sciences Young Adult 0302 clinical medicine Medicine Humans Orthopedics and Sports Medicine Femur Projection (set theory) Femur neck fracture Scanning plane Retrospective Studies 030222 orthopedics Central line Measurement method business.industry Plane (geometry) Femur Neck 030229 sport sciences Middle Aged Surgery Femoral Neck Fractures Coronal plane Female business Nuclear medicine Tomography X-Ray Computed |
| Zdroj: | Orthopaedicstraumatology, surgeryresearch : OTSR. 106(4) |
| ISSN: | 1877-0568 |
| Popis: | Objectives The aim for the present study was to determine whether projection error of measuring Pauwels’ angle in young femur neck fracture could be eliminated by CT plane manipulation. Methods Clinical data of displaced femur neck fractures in young adults aged 20 to 64 years old (13 females and 17 males) were retrospectively analyzed. Their average age was 47.9 years (range: 22–64 years; SD: 11.3). Using modified measurement method for Pauwels’ angle using central line of the shaft as a guideline, the angle of a conventional coronal CT image was measured. CT images were imported into Mimics® software. The scanning plane was then reformatted parallel to the neck axis to eliminate projection error of injured limb. Measured angles were classified into three types (I 50°) and differences were analyzed. Results Average Pauwels’ angle was 52.9° (range: 28.6–68.3°; SD: 9.9; type II, 17 cases; type III, 13 cases) for conventional CT images and 68.7° (range: 29.8–91.2°; SD: 13.4; type II, 1 cases; type III, 29 cases) for reformatted CT images. Difference between these two measurements on average was 15.7° (range: 1.2–34.9°; SD: 7.3). Conclusions Reformatting CT scanning plane by manipulating the proximal fragment to be parallel with the neck axis of the distal neck-shaft fragment is a convenient and reliable technique for eliminating the projection error of measuring Pauwels’ angle in the femur neck fractures. Level of evidence IV, cohort study. |
| Databáze: | OpenAIRE |
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