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Computer-assisted total knee arthroplasty for arthritis with extra-articular deformity
Arun Mullaji1, Gautam M Shetty
1Department of Orthopaedic Surgery, Breach Candy Hospital, Mumbai, India.
The Journal of Arthroplasty
|July 7, 2009
Summary
Computer-assisted total knee arthroplasty (TKA) effectively corrects extra-articular deformities in the femur or tibia. This method improves limb alignment and patient outcomes for knee arthritis complicated by deformities.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Reconstructive Surgery
Background:
- Extra-articular deformities of the femur and tibia present significant challenges in achieving optimal limb alignment during total knee arthroplasty (TKA).
- Accurate restoration of coronal alignment is crucial for successful TKA outcomes, particularly in cases with pre-existing bone deformities or hardware.
- Conventional TKA techniques may struggle to address complex extra-articular deformities, potentially leading to suboptimal functional results.
Purpose of the Study:
- To evaluate the efficacy of computer-assisted total knee arthroplasty (TKA) in managing patients with extra-articular knee deformities.
- To assess the impact of computer-assisted TKA on limb alignment and patient-reported outcomes in the presence of femoral or tibial deformities.
Main Methods:
- Retrospective study of 40 extra-articular deformities (22 femoral, 18 tibial) in 34 patients undergoing TKA.
- Patients were treated with either simultaneous corrective osteotomy or intra-articular correction during computer-assisted TKA.
- Limb alignment was measured preoperatively and postoperatively; functional outcomes were assessed using the Knee Society score.
Main Results:
- Mean preoperative coronal deformity was 9.3 degrees, with a mean preoperative limb alignment of 166.7 degrees.
- Postoperative limb alignment improved significantly to a mean of 179.1 degrees.
- Knee Society knee scores improved from 49.7 to 90.4, and function scores improved from 47.3 to 84.9 at a mean 26.4-month follow-up.
Conclusions:
- Computer-assisted TKA offers a valuable alternative for managing knee arthritis with extra-articular deformities.
- This technique facilitates accurate restoration of limb alignment, even in the presence of complex femoral or tibial deformities or prior hardware.
- Computer-assisted TKA leads to substantial improvements in knee function and patient satisfaction.