Navigated functional alignment total knee arthroplasty achieves reliable, reproducible and accurate results with high patient satisfaction - Report - MDSpire
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Navigated functional alignment total knee arthroplasty achieves reliable, reproducible and accurate results with high patient satisfaction
Navigated Functional Alignment in Total Knee Arthroplasty: Precise Outcomes and Satisfaction
Overview
This study reports 2-year outcomes of 140 patients undergoing computer-assisted surgical (CAS) navigated functional alignment (FA) total knee arthroplasty (TKA). Results demonstrate consistent alignment, soft tissue preservation, favorable patient-reported outcome measures (PROMs), and low revision rates without the need for robotic assistance.
Background
Total knee arthroplasty techniques traditionally follow mechanical alignment (MA) or kinematic alignment (KA) philosophies, but dissatisfaction rates remain up to 20%. Functional alignment (FA) is a newer approach aiming to restore natural knee kinematics and soft tissue balance by customizing implant positioning to the patient's pre-arthritic anatomy. While FA has been reported using robotic systems, this study evaluates the viability of CAS navigation to achieve FA outcomes, addressing accessibility limitations of robotic platforms.
Data Highlights
Parameter
Value
Number of patients
140
Number of knees
165
Mean age (years)
65.07 ± 8.25 (range 43–85)
Gender distribution
55% female, 45% male
Laterality
53% left knees, 46% right knees, 18% bilateral procedures
Navigated FA TKA achieved precise restoration of alignment parameters including Hip-Knee-Ankle angle, mechanical lateral distal femoral angle, and proximal tibial angle.
Soft tissue preservation was prioritized, minimizing releases and maintaining joint line height and obliquity.
Patient-reported outcome measures (WOMAC and Knee Society Scores) improved significantly at 1 and 2 years postoperatively.
Revision rates and implant-related failures were low over the 2-year follow-up period.
CAS navigation systems demonstrated high accuracy and reliability comparable to robotic platforms for FA TKA.
Radiographic and intraoperative measurements showed excellent consistency, supporting the reproducibility of the technique.
Clinical Implications
CAS navigated functional alignment offers a viable alternative to robotic-assisted TKA, enabling surgeons to achieve precise implant positioning and soft tissue balance without the barriers associated with robotic systems. This approach may improve patient satisfaction and functional outcomes by restoring native knee kinematics while preserving soft tissues. Incorporating navigated FA into clinical practice can expand access to advanced alignment techniques and potentially reduce dissatisfaction rates.
Conclusion
Navigated functional alignment in total knee arthroplasty provides consistent, precise outcomes with enhanced patient satisfaction at two years postoperatively. This technique represents a practical and effective option for surgeons seeking to optimize TKA results without reliance on robotic technology.
References
O’Callaghan et al. 2020 -- Functional Alignment Rationale and Surgical Technique
Hirschmann et al. -- Functional Knee Phenotypes and Coronal Alignment of the Knee
BrainLab and Orthomap Navigation Systems -- Accuracy and Reliability Data
