Range of Motion of Standard and High-Flexion Cruciate Retaining Total Knee Prostheses

Yukihide Minoda, MD, PhD, Masaharu Aihara, MD, Akira Sakawa, MD, PhD, Shinichi Fukuoka, MD, PhD, Keiko Hayakawa, MD, and Kenji Ohzono, MD, PhD

The Journal of Arthroplasty Vol. 24 No. 5 2009

Abstract:

Recently, use of high-flexion design was introduced in cruciate-retaining (CR) total knee prostheses. The purpose of this study was to prospectively compare the ranges of motion (ROMs) of 89 knees with standard and 87 knees with highflexion CR total knee prostheses. Differences in age, gender, diagnosis, preoperative ROM of the knee, and Knee Society Score between the 2 groups were not statistically significant. At 12-month follow-up, average ROM was 112.0° ± 12.6° for standard, and 115.3° ± 13.4° for high-flexion CR prosthesis (P = .101). To our knowledge, this is the first report on the ROM with the high-flexion CR total knee prosthesis. Using the technique of anterior referencing for femoral component sizing and using a fixed 7° slope for the tibial component, we found no significant differences between groups with regard to ROM, clinical, or radiographic parameters.