Ick Hwan Yang; Jun Young Chung; Chang Dong Han

doi:10.4055/jkoa.2007.42.2.221

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Yang, Chung, and Han: Total Knee Arthroplasty with Rotating Platform Low Contact Stress® - Minimum 3-Year Follow-up Results -

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2007; 42(2): 221-226.

Published online: 30 April 2007

DOI: https://doi.org/10.4055/jkoa.2007.42.2.221

Total Knee Arthroplasty with Rotating Platform Low Contact Stress® - Minimum 3-Year Follow-up Results -

Ick Hwan Yang, M.D., Jun Young Chung, M.D., Chang Dong Han, M.D.

Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea.

Address reprint requests to Ick Hwan Yang, M.D. Department of Orthopedic Surgery, Yongdong Severance Hospital, 146-92, Dogok-dong, Gangnam-gu, Seoul 135-720, Korea. Tel: +82.2-2019-3416, Fax: +82.2-573-5393, ihyang@yumc.yonsei.ac.kr

Abstract

Purpose

To retrospectively evaluate the clinical and radiology results of total knee arthroplasty using a rotating platform Low Contact Stress (LCS®) Complete™.

Materials and Methods

Of 63 patients (82 knees) who had undergone a total knee arthroplasty with a rotating platform LCS® Complete™ between Jan. 2001 and Dec. 2002, 61 patients (79 knees) were followed up for more than three years and evaluated retrospectively. The average follow-up period was 3.5 years and the diagnosis in all cases was degenerative osteoarthritis. The average age at the time of surgery was 67.4 years, and no patient underwent patella resurfacing.

Results

The average active range of motion increased from 118° (95°-134°) preoperatively to 123° (100°-140°) at the last follow up. The average flexion contracture improved from 15° (0°-30°) preoperatively to 2° (0°-10°) at the last follow up. The average HSS knee score also improved from preoperative 64 points to 90 points at the last follow up. The radiology evaluation revealed a radiolucency rate of 10% in the tibia anteroposterior view and 9% in the femur. The complications encountered were two cases of a polyethylene liner dislocation; one in whom an open reduction was performed, and the other in whom the liner had been exchanged.

Conclusion

A follow-up of the rotating platform LCS® Complete™ of more than three years yielded overall satisfactory results in the range of motion and function. However, there should be some concern regarding the development of polyethylene liner dislocation.

Keywords: Knee joint, Total knee arthroplasty, Rotating platform LCS, Polyethylene liner dislocation

Figures and Tables

Fig. 1

(A) Preoperative radiographs of a 74-year-old female showing degenerative osteoarthritis. (B) Post-operative radiographs shows a total knee replacement status using a rotating platform LCS® system. (C) On POD 2 weeks, a polyethylene liner dislocation developed. (D) After the first open reduction. (E) On POD 17 days, the liner dislocation recurred. (F) After the second open reduction. (G) At POD 7 months, the polyethylene liner dislocation recurred. (H) The liner was exchanged from 12.5 mm to 15 mm. No further liner dislocation has developed since then.

Table 1

Flexion Contracture and Range of Motion

Table 2

Distribution of the Functional Results according to the HSS Score

Table 3

Distribution and Incidence of the Radiolucent Line in the Femoral and Tibial Component

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