Does kinematic alignment better restore gait in CPAK type 1 TKA?

Overview

Kinematic alignment (KA) did not show statistically significant differences in knee kinematics compared to mechanical alignment (MA) one year post-total knee arthroplasty (TKA).

Background

Total knee arthroplasty (TKA) aims to restore natural limb alignment, with kinematic alignment being a proposed method. Understanding the impact of alignment strategies on postoperative outcomes is crucial.

Data Highlights

No statistically significant differences in knee kinematics were found between kinematic alignment (KA) and mechanical alignment (MA) during level or downhill walking one year post-TKA.

Key Findings

• No significant differences in knee kinematics between KA and MA at one year postoperatively.
• Mean Forgotten Joint Score (FJS) was higher in KA (65) compared to MA (52).
• Among CPAK type 1 patients, KA showed smaller kinematic deviations from healthy controls than MA.
• Preoperative range of motion (ROM) positively correlated with postoperative FJS in KA patients (r = 0.5).
• KA demonstrated slightly greater knee joint distraction than MA, particularly in CPAK type 1 patients.
• Study limitations included a smaller sample size and the use of treadmill walking for gait analysis.

Clinical Implications

The findings suggest that preoperative characteristics, such as range of motion, may help identify patients who could benefit more from kinematic alignment. Clinicians should consider these factors when determining alignment strategies for TKA.

Conclusion

The study did not demonstrate significant differences in knee kinematics between alignment strategies.

Related Resources & Content

1. Archives of Orthopaedic and Trauma Surgery, 2026 -- Analysis of CPAK change in robotic functional alignment TKA: a new simplified classification
2. Archives of Orthopaedic and Trauma Surgery, 2022 -- Impact of Kinematic Alignment on Femorotibial Motion in Medial Stabilized Total Knee Arthroplasty Compared to Mechanical Alignment
3. Archives of Orthopaedic and Trauma Surgery, 2026 -- Radiolucent lines after robotic-assisted surface-matching kinematically aligned UKA: short-term incidence and lack of association with tibial alignment
4. MDSpire News, 2023 -- Mechanical TKA Alignment Has Most Data
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