The radiological outcomes of patient-specific instrumentation versus conventional total knee arthroplasty
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Jerry Yongqiang Chen1, Seng Jin Yeo, Andy Khye Soon Yew
1Department of Orthopaedic Surgery, Singapore General Hospital, Block 6 Level 7, Outram Road, Singapore, 169608, Singapore, yqjchen@gmail.com.
Purpose:
The aim of this study was to investigate the post-operative radiological outcomes of patient-specific instrumentation (PSI) surgery versus conventional total knee arthroplasty (TKA).
Methods:
Sixty patients scheduled for a primary TKA were prospectively divided into PSI or conventional technique. Coronal and sagittal radiographic long limb films were taken post-operatively. The accepted values for normal alignment were 180° ± 3° for hip-knee-ankle angle; 90° ± 3° for coronal femoral component angle or coronal tibia component angle; 0° to 3° flexion for sagittal femoral component angle and 0° to 7° posterior slope for sagittal tibia component angle.
Results:
For hip-knee-ankle angle, there were 21 % more outliers in the PSI group compared to the conventional group (p = 0.045). Most of these outliers had valgus deformity in the PSI group and varus deformity in the conventional group (p = 0.045). For implant placement, there was no difference in the proportion of outliers between the two groups. There was also no difference in the duration of surgery.
Conclusions:
This study showed that PSI surgery is associated with a larger proportion of outliers for lower limb alignment. PSI surgery as an alternative to conventional TKA is not advisable.
Level Of Evidence:
II.
