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. 2016 Mar;28(1):39-45.
doi: 10.5792/ksrr.2016.28.1.39. Epub 2016 Feb 29.

Two- to Four-Year Follow-up Results of Total Knee Arthroplasty Using a New High-Flexion Prosthesis

Man Soo Kim  1 , In Jun Koh  1 , Sung Won Jang  1 , Neung Han Jeon  1 , Yong In  1
Affiliations

Two- to Four-Year Follow-up Results of Total Knee Arthroplasty Using a New High-Flexion Prosthesis

Man Soo Kim et al. Knee Surg Relat Res. 2016 Mar.

Abstract

Purpose: The purpose of this study was to evaluate minimum 2-year follow-up results of total knee arthroplasty (TKA) performed using a new high-flexion prosthesis design (LOSPA).

Materials and methods: The 2- to 4-year results of 191 consecutive TKAs (177 patients) with the LOSPA posterior-stabilized prosthesis were evaluated. The patients were assessed clinically and radiographically using the Knee Society scoring system (KSS) and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC).

Results: The mean range of motion (ROM) increased significantly from 117.4° (range, 75° to 140°) preoperatively to 126.7° (range, 80° to 144°) postoperatively (p<0.001). The mean KSS and WOMAC scores improved significantly from 121.4 (range, 42 to 185) and 56.1 (range, 23 to 88) preoperatively to 174.0 (range, 130 to 200) and 16.4 (range, 0 to 85) postoperatively, respectively (both, p<0.001). One knee required revision for deep infection. No knee had aseptic loosening or osteolysis. Radiolucent lines were noted in 15 knees (7.9%).

Conclusions: The new high-flexion total knee prosthesis resulted in no early aseptic loosening of the component and improved postoperative ROM comparable to other high-flexion TKA prostheses at 2- to 4-year follow-ups.

Keywords: Arthroplasty; Knee; Outcome assessment; Prosthesis design; Range of motion.

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Figures

Fig. 1
Fig. 1. Femoral component, tibial insert, and tibial component of the LOSPA total knee prosthesis. LOSPA prosthesis requires removal of additional bone from the posterior femoral condyle to add 10 mm posterior condyle at a large posterior radius of the femoral component. In addition, the femoral component has a more rounded contour and a deepened patellar groove to help deep flexion. The posterior surface of the insert is released for deep flexion favoring design.
Fig. 2
Fig. 2. The lateral radiograph of the left knee of a 68-year-old female shows radiolucent lines around the anterior cortex and posterior condylar area 3 years postoperatively. Arrow: these findings were not progressive and the patient had no symptoms or signs of aseptic loosening.
See this image and copyright information in PMC

References

    1. Heiberg K, Bruun-Olsen V, Mengshoel AM. Pain and recovery of physical functioning nine months after total knee arthroplasty. J Rehabil Med. 2010;42:614–619. - PubMed
    1. Kurosaka M, Yoshiya S, Mizuno K, Yamamoto T. Maximizing flexion after total knee arthroplasty: the need and the pitfalls. J Arthroplasty. 2002;17(4 Suppl 1):59–62. - PubMed
    1. Mulholland SJ, Wyss UP. Activities of daily living in non-Western cultures: range of motion requirements for hip and knee joint implants. Int J Rehabil Res. 2001;24:191–198. - PubMed
    1. Gupta SK, Ranawat AS, Shah V, Zikria BA, Zikria JF, Ranawat CS. The P.F.C. sigma RP-F TKA designed for improved performance: a matched-pair study. Orthopedics. 2006;29(9 Suppl):S49–S52. - PubMed
    1. Jones RE. High-flexion rotating-platform knees: rationale, design, and patient selection. Orthopedics. 2006;29(9 Suppl):S76–S79. - PubMed

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