Schwarz, T. and Benditz, A. and Springorum, H. -R. and Matussek, J. and Heers, G. and Weber, M. and Renkawitz, T. and Grifka, J. and Craiovan, B. (2018) Assessment of pelvic tilt in anteroposterior radiographs by means of tilt ratios. ARCHIVES OF ORTHOPAEDIC AND TRAUMA SURGERY, 138 (8). pp. 1045-1052. ISSN 0936-8051, 1434-3916
Full text not available from this repository. (Request a copy)Abstract
In anteposterior (AP) radiographs, cup position in total hip arthroplasty and acetabular anatomy in hip-preserving surgery are highly influenced by pelvic tilt. The sagittal rotation of the anterior pelvic plane is an important measurement of pelvic tilt during hip surgery. Thus, correct evaluation of cup position and acetabular parameters requires the assessment of pelvic tilt in AP radiographs. Changes in pelvic tilt inversely change the height of the lesser pelvis and the obturator foramen in AP radiographs. Tilt ratios were calculated by means of these two parameters in simulated radiographs for ten male and ten female pelvises in defined tilt positions. A tilt formula obtained by exponential regression analysis was evaluated by two blinded investigators by means of 14 simulated AP radiographs of the pelvis with pelvic tilts ranging from + 15A degrees to - 15A degrees. No differences were found between male and female tilt ratios for each 5A degrees step of simulated pelvic tilt. Pelvic tilt and tilt ratios correlated exponentially. Using the tilt formula, the two blinded investigators were able to assess pelvic tilt with high conformity, a mean relative error of + 0.4A degrees (SD +/- 4.6A degrees), and a mean absolute error of 3.9A degrees (SD +/- 2.3A degrees). Neutral pelvic tilt is indicated by a tilt ratio of 0.5 when the height of the lesser pelvis is twice the height of the obturator foramen. The analysis and interpretation of cup position and acetabular parameters may be improved by our method for assessing pelvic tilt in AP radiographs.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TOTAL HIP-ARTHROPLASTY; ACETABULAR CUP NAVIGATION; SAGITTAL ALIGNMENT; STANDING POSITION; PARAMETERS; ROTATION; SPINE; THA; Pelvic tilt; Cup position; Anterior pelvic plane; Total hip arthroplasty; Acetabular parameters |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Orthopädie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Mar 2020 11:00 |
| Last Modified: | 10 Mar 2020 11:00 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14190 |
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