Laser Resonance Frequency Analysis: A Novel Measurement Approach to Evaluate Acetabular Cup Stability During Surgery
Shunsuke Kikuchi,
Katsuhiro Mikami,
Daisuke Nakashima,
Toshiyuki Kitamura,
Noboru Hasegawa,
Masaharu Nishikino,
Arihiko Kanaji,
Masaya Nakamura,
Takeo Nagura
Affiliations
Shunsuke Kikuchi
Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
Katsuhiro Mikami
Department of Biology-Oriented Science and Technology, Kindai University, 930 Nishi-Mitani, Kinokawa city, Wakayama 649-6493, Japan
Daisuke Nakashima
Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
Toshiyuki Kitamura
Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, 817 Umemidai, Kizugawa city, Kyoto 619-0215, Japan
Noboru Hasegawa
Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, 817 Umemidai, Kizugawa city, Kyoto 619-0215, Japan
Masaharu Nishikino
Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, 817 Umemidai, Kizugawa city, Kyoto 619-0215, Japan
Arihiko Kanaji
Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
Masaya Nakamura
Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
Takeo Nagura
Department of Orthopaedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
Artificial joint acetabular cup stability is essential for successful total hip arthroplasty. However, a quantitative evaluation approach for clinical use is lacking. We developed a resonance frequency analysis (RFA) system involving a laser system that is fully contactless. This study aimed to investigate the usefulness of laser RFA for evaluating acetabular cup stability. First, the finite element method was performed to determine the vibration mode for analysis. Second, the acetabular cup was press-fitted into a reamed polyurethane cavity that replicated the human acetabular roof. The implanted acetabular cup was vibrated with pulse laser irradiation and the induced vibration was detected with a laser Doppler vibrometer. The time domain signal from the vibrometer was analyzed by fast Fourier transform to obtain the vibration frequency spectrum. After laser RFA, the pull-down force of the acetabular cup was measured as conventional implant fixation strength. The frequency of the first highest amplitude between 2 kHz and 6 kHz was considered as the resonance peak frequency, and its relationship with the pull-down force was assessed. The peak frequency could predict the pull-down force (R2 = 0.859, p < 0.000). Our findings suggest that laser RFA might be useful to measure acetabular cup stability during surgery.
