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Published on: May 5, 2023
Patient-specific instrumentation improves tibial component rotation in TKA
Alcindo Silva1, Ricardo Sampaio, Elisabete Pinto
1Orthopedics Departament, Hospital Militar D. Pedro V, Avenida da Boavista, 4050-113, Porto, Portugal, alcindocsilva@gmail.com.
Summary
Patient-specific instrumentation in total knee arthroplasty (TKA) may reduce tibial component malrotation. This study found Signature™ patient-specific instrumentation resulted in less dispersion and amplitude of tibial component rotation compared to conventional methods.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Total knee arthroplasty (TKA) is a common procedure for knee osteoarthritis.
- Component rotational alignment is crucial for optimal TKA outcomes.
- Patient-specific instrumentation (PSI) aims to improve surgical accuracy.
Purpose of the Study:
- To compare the rotational alignment of femoral and tibial components in TKA.
- To evaluate the effectiveness of patient-specific instrumentation versus conventional instrumentation.
Main Methods:
- Prospective randomized study of 45 primary TKA patients.
- Patients divided into conventional instrumentation (n=22) and Signature™ PSI (n=23) groups.
- Computed tomography (CT) used to measure component rotation post-surgery.
Main Results:
- No significant differences in femoral or tibial component rotation between groups.
- Tibial component rotation showed similar differences from neutral in both groups.
- PSI group exhibited significantly less dispersion and amplitude of tibial component rotation around neutral.
Conclusions:
- Signature™ patient-specific instrumentation may reduce the likelihood of tibial component internal malrotation.
- PSI offers improved precision in tibial component positioning with less variability.
