Related Experiment Video
Updated: Mar 8, 2026
07:33
In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
Published on: May 5, 2023
1.2K
Patient-specific instrumentation for total knee arthroplasty
Arash Nabavi1, Caroline M Olwill1, Mike Do2
11 Sydney Bone and Joint Clinic, Chipping Norton, Sydney, NSW, Australia.
Journal of Orthopaedic Surgery (Hong Kong)
|February 1, 2017
Summary
Total knee replacements (TKRs) using patient-specific instrumentation accurately matched preoperative plans. This CT-based approach demonstrated high precision in aligning knee implants, improving surgical outcomes.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Medical Imaging
Background:
- Total knee replacement (TKR) aims to restore function and alignment.
- Patient-specific instrumentation (PSI) offers personalized surgical planning.
- Accuracy in component placement is crucial for TKR success.
Purpose of the Study:
- To evaluate the accuracy of total knee replacements (TKRs) performed with CT-based patient-specific instrumentation.
- To compare postoperative implant alignment with preoperative surgical plans.
Main Methods:
- Fifty patients undergoing TKR with CT-based PSI were assessed postoperatively.
- Measurements included coronal, sagittal, and rotational alignment of femoral and tibial components.
- The Perth protocol and CT scans were used for precise measurements.
Main Results:
- 98% of patients achieved planned coronal alignment (HKA angle).
- Femoral and tibial component alignment in coronal and sagittal planes showed high accuracy (92-100%).
- 90% of patients had femoral rotation within 3° of the plan, with 86% achieving good-to-excellent outcomes.
Conclusions:
- CT-based patient-specific instrumentation for TKR accurately reproduces preoperative surgical plans.
- This technology demonstrates high precision in achieving desired implant alignment.
- Accurate alignment achieved with PSI correlates with positive patient outcomes.
