Total knee arthroplasty for severe valgus knee deformity

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Severe valgus knee deformities present challenges in primary total knee arthroplasty (TKA).
• Implant selection and surgical technique depend on deformity severity and soft-tissue release extent.

Purpose of the Study:

• To review 8-11 year outcomes of primary TKA in severe (variant-III) valgus knees using different implant types.
• To evaluate the efficacy of various implants in correcting severe valgus knee deformities.

Main Methods:

• Retrospective review of 37 primary TKAs in 32 patients (variant-III valgus knees) between 2002-2005.
• Utilized cruciate-retaining, Genesis II, and hinged knee implants; bone resection balanced the knee, avoiding extensive soft tissue releases.
• Assessed Hospital for Special Surgery (HSS) knee scores, tibiofemoral alignment, range of motion, and patient satisfaction over 8-11 years.

Main Results:

• Significant improvements observed in mean HSS knee score (50.33 to 90.06) and tibiofemoral alignment (32.72° valgus to 4.89°).
• Mean range of motion improved from 93.72° to 116.61° post-operation.
• 100% prosthetic survival at a mean of 10 years; patient satisfaction averaged 80.7 points. No revisions were performed.

Conclusions:

• Primary TKA using various implant types, including non-hinged options, can be successful for variant-III valgus knees.
• Proper ligament balancing techniques are crucial and may obviate the need for highly constrained components.
• This study presents alternative implant choices for managing severe knee deformities.