Does hyperflex total knee design improve postoperative active flexion?

Massin, P.; Dupuy, F.-R.; Khlifi, H.; Fornasieri, C.; Polignac, T. de; Schifrine, P.; Farenq, C.; Mertl, P.

doi:10.1016/j.otsr.2009.11.015

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…However, they experienced a decrease in the mean maximum flexion they could achieve. This is similar to previous reports that Western patients with more than 120°of preoperative flexion experienced a decrease in flexion range [30,46]. There is a tendency for better postoperative flexion after TKA performed in Asian countries [5, 7, 8, 17, 18, 20, 24-26, 34, 40, 41, 43, 45, 50] than after TKA performed in Western countries [1,35,39,47,49] (Table 3).…”

Section: Discussionsupporting

confidence: 90%

“…Student's paired t-tests were used to determine the difference between preoperative and postoperative values of all continuous outcome variables (HSS score, flexion contracture, maximum flexion, and ROM). To analyze the effects of the maximum postoperative flexion and the rate of achieving high flexion more than 135°, we grouped patients according to the maximum preoperative flexion (B 110°; 105°-115°; 120°-130°; C 135°), because this is known as a most predictable factor for postoperative flexion [28,37] and flexion gain may be different according to preoperative flexion [3,16,30]. To determine the knee survival for aseptic loosening, we used the life-table method for all patients [12].…”

Section: Methodsmentioning

confidence: 99%

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High-flexion Prosthesis Improves Function of TKA in Asian Patients Without Decreasing Early Survivorship

Lee

Chung²,

Kim

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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Background Two previous studies recently raised the possibility of a high risk of early femoral components loosening with high-flexion (HF) prostheses in Asian populations and suggested that the high failure rate of HF TKAs was associated with HF ability. However, these findings are controversial given other studies reporting a low incidence of aseptic failures in HF prostheses.Questions/purposes We therefore determined (1) the rate of achieving postoperative HF after HF TKA; (2) whether the aseptic loosening rate of HF prostheses is high; and (3) whether the survivorship was worsened in patients who achieved postoperative deep knee flexion in our cohort of Korean patients. Methods We retrospectively reviewed 488 patients who had 698 primary TKAs using the NexGen 1 Legacy Posterior-Stabilized Flex system implanted from 2003 to 2010. There were 40 men and 448 women with a mean age of 68 years. We obtained Hospital for Special Surgery scores, maximal flexion, and radiographs. The minimum followup for functional and radiographic evaluations was 2 years (median, 4.8 years; range, 2-8.7 years). We performed a survival analysis on all patients for aseptic loosening. Results Three hundred sixty knees (52%) could achieve C 135°maximum flexion. Six of the 698 knees (0.9%) developed aseptic loosening (three femoral and three tibial). The survival at 5 years for aseptic loosening was 99.1%. The overall survival for aseptic failure did not differ between knees that achieved HF and those that did not.

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Section: Discussionsupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

High-flexion Prosthesis Improves Function of TKA in Asian Patients Without Decreasing Early Survivorship

Lee

Chung²,

Kim

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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“…인공 슬관절 디자인을 도입하여 안정성과 기능에서 기존의 인공 슬관절의 결과와 비슷하거나 더 우수하다는 결과가 많은 저자들 에 의해 보고되고 있다. 1,[3][4][5][6][7][8][9][10][11][12][13] 1). 17 Values are presented as median (range).…”

Section: 전재균·송인수·선두훈 외 2인unclassified

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

Chon

Song

Sun

et al. 2013

J Korean Orthop Assoc

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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 (α , β , γ , δ ), 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 4.3 o to valgus 6.6 o (p=0.02) in group A, and varus 4.4 o to valgus 6.5 o (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 α , p=0.17 in β , p=0.12 in γ , p=0.17 in δ ). 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.

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“…Our results are in contrast with another study using the same mobile-bearing high flexion design Rotating Platform Flexion (Sigma RPF), which concluded that preoperative flexion and the design of the knee prosthesis were the predominant factors of postoperative flexion. 26 But that study was most likely done in Caucasians. Another previous study also found that preoperative flexion played a significant role in the postoperative gain in flexion and not the type of prosthesis.…”

Section: Discussionmentioning

confidence: 99%

A comparison of clinical and patient-reported outcome measures of TKR: Comparison of Asian to North American patients

Budhiparama

Gaudiani

White

et al. 2019

J Orthop Surg (Hong Kong)

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Background: Cultural differences between continents may also affect the outcome on interventions. This study compared an Asian and North American cohort of total knee replacement (TKR) patients. Questions/purposes: This study aims to compare the patient-reported outcome measures as well as a functional outcome after TKR between these two different patient populations with a different cultural societal background in two different countries. Patients and Methods: A retrospective study on two cohorts of 76 Asian TKR patients and 64 North American TKR patients were compared. Demographics, patient-reported outcome measures (Knee Society Score (KSS), Patient-Administered Questionnaire (PAQ), and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC)), knee range of motion (RoM), and radiographic component position were compared. Results: The Asian cohort had more females compared to the North American and significantly worse preoperative RoM, and worse KSS function score and PAQ pain scores. The preoperative KSS knee score and WOMAC scores were comparable between the two groups. Postoperatively, the differences in WOMAC and KSS knee scores were significant, while KSS function and PAQ were comparable between groups. Conclusions: Even though Asian TKR patients had significantly worse preoperative scores, their postoperative outcomes were comparable to North Americans. The higher preoperative functional deficit and the higher pain levels in the Asian population might be due to cultural differences and/or socioeconomic reasons, which made Asian patients present with more severe conditions in the preoperative consultation for a possible surgical treatment compared to North Americans. More research is needed to investigate the difference between these cultural impacts on TKR outcomes.

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Does hyperflex total knee design improve postoperative active flexion?

Abstract: Level 3, therapeutic study.

Cited by 10 publications

References 15 publications

High-flexion Prosthesis Improves Function of TKA in Asian Patients Without Decreasing Early Survivorship

High-flexion Prosthesis Improves Function of TKA in Asian Patients Without Decreasing Early Survivorship

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

A comparison of clinical and patient-reported outcome measures of TKR: Comparison of Asian to North American patients

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