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Clinical and Radiographic Outcomes of Inversed Restricted Kinematic Alignment Total Knee Arthroplasty by Asia
Shang-Lin Hsieh1,2, Tsung-Li Lin1,2,3, Chih-Hung Hung1
1Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan.
Inverse restricted kinematic alignment (irKA) for total knee arthroplasty (TKA) effectively corrects knee alignment across all subtypes, improving patient satisfaction. This technique is particularly beneficial for knees with preoperative varus deformity, with patient-reported scores predicting successful outcomes.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Arthroplasty
Background:
- Restricted kinematic alignment (rKA) is a surgical technique for total knee arthroplasty (TKA).
- Inverse restricted kinematic alignment (irKA) is a modification of rKA.
- Huang's phenotypes classify Asian knees into five types.
Purpose of the Study:
- To evaluate the outcomes of irKA-TKA across all Huang's knee phenotypes.
- To assess knee alignment and patient-reported satisfaction after irKA-TKA.
- To determine the predictive value of preoperative scores for irKA-TKA prognosis.
Main Methods:
- Prospective single-center study of 96 irKA-TKA procedures.
- Classification of knees into Huang's phenotypes (Type 1-5).
- Assessment of knee alignment and patient satisfaction using WOMAC and FJS-12 scores at one-year follow-up.
Main Results:
- irKA-TKA significantly corrected knee alignment in Type 4, Type 2, and Type 3 knees.
- Type 5 and Type 1 knees showed significant correction in some angles.
- Good correlation between FJS-12 and WOMAC scores was observed, indicating predictive value for prognosis.
Conclusions:
- irKA-TKA demonstrates effectiveness in correcting knee alignment for all subtypes, leading to improved patient satisfaction at one year.
- Knees with preoperative varus deformity are ideal candidates for irKA-TKA.
- Preoperative WOMAC and FJS-12 scores can predict the prognosis of irKA-TKA.
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