Abstract
Purpose
To assesment of geometric center of knee as a reference for femoral component rotation in primary total knee arthroplasty.
Methods
A prospective study done from dec 2009 to dec 2011 at tertiary centre. 180 knees were included (124 females and 56 males). All cases were randomly allocated into 2 groups: navigated and non navigated. All surgeries were carried out by two senior arthroplasty surgeons. All patients undergoing primary total knee replacement were included and all revision cases were excluded. Postoperative geometric center of knee was assessed by taking CT scan.
Results
The mean PCA was around 5° with geometric knee centre axis and 9° in TEA. No postoperative patellar maltracking was seen. Anterior knee pain was present in 7% patients. No postop infection is noted. Alignment ranging from 3° to 12° external rotation.
Conclusion
Geometric centre of knee is most accurate measure for referencing of femoral component rotation, as compared TEA, which can lead to excessive external rotation.
Key words – Geometric centre of knee, total knee arthroplasty, femoral component rotation
