A measurement and estimation method for orthopedics diagnosis is disclosed, which includes providing resonant frequency of a bone of a person, a length of the bone, and a personal correction parameter. According to the resonant frequency, the length, and the personal correction parameter, a bone density of the bone is determined. The personal correction parameter can be a perimeter parameter or a weight parameter. The method could further compare the amplitude of input fundamental frequency and that of the output harmonic to estimate artificial hip-joint loosen.一種骨科診斷之量測與判斷方法,包含提供受測者之骨之共振頻率、骨長度、受測者之校正參數,接著將根據共振頻率、骨長度及校正參數套入公式中計算以求出此骨之骨質密度。校正參數可為周長參數或重量參數。此方法更透過比較輸入之基頻振幅與產生之諧波振幅判斷人工髖關節是否鬆脫。510~590...步驟
