J Korean Orthop Assoc.  2013 Dec;48(6):449-456. 10.4055/jkoa.2013.48.6.449.

Comparison of Two Year Follow-Up Results in High Flexion Total Knee Arthroplasty with Lospa and Scorpio NRG

• Chon JG
• Song IS
• Sun DH
• Jang SW
• Lee JG

• KMID: 2185279
• DOI: http://doi.org/10.4055/jkoa.2013.48.6.449

Abstract

PURPOSE
The purpose of this study is to evaluate the clinical and radiologic results after high flexion Lospa (Corentec Inc.) and Scorpio NRG (Stryker Inc.) total knee arthroplasty.
MATERIALS AND METHODS
We prospectively compared 205 knees in 128 patients who underwent arthroplasty using Lospa (group A) and 164 knees in 102 patients who underwent arthroplasty using Scorpio NRG (group B) from September 2010 to March 2012 at Department of Orthopaedic Surgery, Sun General Hospital (Daejeon, Korea). Mean follow-up period was 23 months in group A and 24 months in group B. The radiologic analysis included the change of mechanical axis deviation and femoro-tibial angle, implant position (alpha, beta, gamma, delta), and patellar tilt. The clinical results were evaluated according to hospital for special surgery (HSS), knee society score (KSS), and range of motion.
RESULTS
Mechanical axis deviations were change in varus from 34.8 mm to 2.6 mm (p=0.02) in group A, and change in varus from 34.3 mm to 3.1 mm (p=0.04) in group B; no statistically significant difference was observed between them (p=0.13). Femoro-tibial angles were varus 4.3degrees to valgus 6.6degrees (p=0.02) in group A, and varus 4.4degrees to valgus 6.5degrees (p=0.03) in group B; no significant difference was observed between them (p=0.25). No significant difference in implant position was observed between the two groups (p=0.25 in alpha, p=0.17 in beta, p=0.12 in gamma, p=0.17 in delta). Mean HSS improved from 48.5 to 93.6 (p=0.02) in group A, and from 41.4 to 94.4 (p=0.01) in group B.
CONCLUSION
Lospa total knee arthroplasty showed excellent early radiologic, clinical results and no statistically significant difference in the results was observed between Lospa and Scorpio NRG.

Keyword

total knee arthroplasty; high flexion; Lospa

MeSH Terms

Arthroplasty*
Axis, Cervical Vertebra
Follow-Up Studies*
Hospitals, General
Humans
Knee*
Prospective Studies
Range of Motion, Articular
Solar System

Figure

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  Figure 1 Deep flexion favoring design of (A) Lospa total knee arthroplasty requires cutting of the posterior condyle to 10 mm compared with 8 mm of (B) Scorpio NRG.

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  Figure 2 A 72-year-old female showed (A) advanced osteoarthritis on both knees with left knee subluxation. She underwent Lospa total knee arthroplasty and demonstrated well positioned implants. (B) The α angle was measured between the parallel to the femoral condyles and a line drawn along the femoral shaft axis. The β angle was calculated between the parallel to the tibial metal baseplate and a line drawn along the tibial axis shaft. (C) Whereas sagittal tibial δ and femoral γ angles were measured on lateral knee radiographs with the patient lying and the knee flexion.

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