Automatic assessment of the knee alignment angle on full-limb radiographs

作者：Fakhrai Negar; Widhalm Peter; Chiari Catharina; Weber Michael; Langs Georg; Donner Rene; Ringl Helmut; Jantsch Marion; Peloschek Philipp^*

来源：European Journal of Radiology, 2010, 74(1): 236-240.

DOI：10.1016/j.ejrad.2009.02.004

• Knee
• Knee alignment
• Automatic
• Full-limb radiographs
• Pattern recognition
• Computer aided diagnosis

In this study a fully automatic assessment of the knee alignment angles in full-limb radiographs was developed and compared to manual standard of reference measurements in a prospective manner.
The data consisted of 28 knees which were gathered from total-leg radiographs of 15 patients (12 males and 3 females with a mean age of 29.4 +/- 6.9 years) consecutively.
For statistical evaluation, a leave-one-out cross-validation was performed. The pattern recognition and consequently the fully automatic assessment were successful in all patients.
The automatically measured angles highly correlated with the standard of reference (r = 0.989). The mean absolute difference was 0.578 degrees (95% CI: 0.399-0.757 degrees). 82% of the angles differed less than 1 degrees from the standard of reference, 46% differed less than 0.5 degrees and 31% differed less than 0.2 degrees. The automatic method showed a high agreement between repeated measurements (+0.515 degrees to -0.429 degrees).
The automatic assessment of alignment angles in full-limb radiographs were equal to the manual assessment. No measurement related user interaction was necessary to achieve results.

• 出版日期2010-4
• 单位INRIA