Proposed Methods for Real-Time Measurement of Posterior Condylar Angle during TKA
10.5792/ksrr.2014.26.4.230
- Author:
Prateek BEHERA
1
;
Devendra Kumar CHOUHAN
;
Mahesh PRAKASH
;
Mandeep DHILLON
Author Information
1. Department of Orthopedics, Postgraduate Institute of Medical Education and Research, Chandigarh, India. drdevnim@gmail.com
- Publication Type:Original Article
- Keywords:
Knee;
Osteoarthritis;
Arthroplasty;
Posterior condylar axis
- MeSH:
Arthroplasty;
Axis, Cervical Vertebra;
Humans;
Knee;
Osteoarthritis;
Passive Cutaneous Anaphylaxis;
Tomography, X-Ray Computed
- From:The Journal of Korean Knee Society
2014;26(4):230-235
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: Conventional instruments are known to result in high numbers of outliers in restoring femoral component rotation primarily due to fixed degree of external rotation resection relative to the posterior condylar line (PCL). Outliers can be reduced by determining the patient specific posterior condylar angle (PCA) preoperatively or intraoperatively. There is a paucity of methods that can be used during surgery for determining the PCA. We propose two simple, real-time methods to determine the PCA and hence to measure the axial anatomical variation during surgery. MATERIALS AND METHODS: The study was conducted using axial computed tomography (CT) scans of the knees of 26 patients. The commercial software K-PACS and our proposed two methods (trigonometric and protractor) were used to measure the angle between the transepicondylar axis and PCL, i.e., PCA. Statistical comparison between the mean angles obtained by K-PACS and our methods were done. RESULTS: The three methods resulted in similar PCAs. The mean PCA measured by the three methods were similar. The mean PCA value measured by the K-PACS, trigonometric method and protractor method was 6.27degrees (range, 0degrees to 12degrees), 6.23degrees (range, 0degrees to 11.11degrees) and 6.31degrees (range, 0degrees to 12degrees), respectively. There were significant correlations between the K-PACS measured PCA and trigonometrically or protractor measured PCA. CONCLUSIONS: Our novel, simple, easily reproducible, real-time and radiation-free PCA measurement methods obviate the need for preoperative CT scan for identification of patient specific PCA.
