Comparison of computer-navigated and conventional total knee arthroplasty in patients with Ranawat type-II valgus deformity: medium-term clinical and radiological resultsReportar como inadecuado




Comparison of computer-navigated and conventional total knee arthroplasty in patients with Ranawat type-II valgus deformity: medium-term clinical and radiological results - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

BMC Musculoskeletal Disorders

, 15:390

Orthopedics and biomechanics

Abstract

BackgroundArthritic knees with Ranawat type-II valgus deformity present with soft tissue contracture and osseous anomalies that make total knee arthroplasty TKA difficult. We hypothesized that computer-navigated-TKA CN-TKA may be superior to conventional techniques and provide better mid-term radiographic and clinical outcomes in such cases.

MethodsBetween January 2002 and January 2009, patients with Ranawat type-II valgus deformity who underwent primary TKA were entered into this retrospective study. Conventional TKA and CN-TKA were compared for the accuracy of component placement, joint line level, and postoperative limb alignment. International Knee Society scores and patellar scores were used for clinical assessment.

ResultsA total of 62 patients 70 knees with a minimum of 5 years of follow-up were studied. Conventional TKA was performed in 36 knees and CN-TKA in 34 knees. A significantly higher rate of lateral retinaculum release was recorded in the conventional TKA group compared to the CN-TKA group. Proper restoration of joint line was achieved using CN-TKA. The range of motion of the knees was similar in both groups preoperative and postoperatively. There were no significant differences in reconstructed mechanical axes, accuracy of component positioning, and difference in perioperative hemoglobin level between the two groups. At a mean follow-up of 6.2 years, both groups had significant postoperative improvements in clinical performance, however the difference did not reach statistical significance between both techniques.

ConclusionsOur findings demonstrate that CN-TKA can properly restored the joint line level for arthritic knees with Ranawat type II valgus deformity. However, no differences in clinical function, limb and component alignment, or survival of the prostheses were noted between the CN-TKA and conventional TKA groups at a mean follow-up of 6.2 years.

KeywordsGenu valgus deformity Computer-navigated surgery Total knee arthroplasty Cruciate retaining Electronic supplementary materialThe online version of this article doi:10.1186-1471-2474-15-390 contains supplementary material, which is available to authorized users.

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Autor: Tsan-Wen Huang - Chien-Yin Lee - Shih-Jie Lin - Kuo-Ti Peng - Kuo-Chin Huang - Mel S Lee - Robert Wen-Wei Hsu - Wun-Jer 

Fuente: https://link.springer.com/



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