Nankaku Manabu, Akiyama Haruhiko, Kanzaki Hideto, Kakinoki Ryosuke
Rehabilitation Unit, Kyoto University Hospital, 54 Kawahara-cho, Shogoin, Sakyo-ku Kyoto, Japan.
Hip Int. 2012 Sep-Oct;22(5):521-6. doi: 10.5301/HIP.2012.9729.
The purpose of this study was to identify factors related to walking efficiency in the early postoperative period of total hip arthroplasty (THA).
The subjects of this study were 18 women who had undergone unilateral THA 4 weeks before and 18 healthy women as control. Using a force plate and a 3-D motion analyser, we measured: 1) gait speed, stride length, cadence; 2) centre of mass displacement in the three directions; 3) asymmetry of the centre of mass movement in vertical direction; and 4) the total internal work per unit mass and distance walked (a negative index of walking efficiency).
Compared with healthy persons, THA patients showed significantly greater total internal work per unit mass and distance walked. The vertical centre of mass motion of the THA patients demonstrated an asymmetrical pattern. In THA patients, the stepwise multiple regression analysis selected the displacement and the asymmetrical vertical motion of centre of mass as the sole significant variable affecting walking efficiency (R2 = 0.81).
Our findings indicated that rehabilitation programs that control the vertical movement of the centre of mass during gait are important to improve walking ability in the early post-operative phase after THA.
本研究旨在确定与全髋关节置换术（THA）术后早期步行效率相关的因素。
本研究的受试者为18名在4周前接受单侧THA的女性以及18名作为对照的健康女性。使用测力板和三维运动分析仪，我们测量了：1）步速、步长、步频；2）三个方向上的质心位移；3）垂直方向上质心运动的不对称性；4）单位质量和步行距离的总内功（步行效率的负指标）。
与健康人相比，THA患者单位质量和步行距离的总内功明显更大。THA患者的垂直质心运动呈现不对称模式。在THA患者中，逐步多元回归分析选择质心位移和垂直方向的不对称运动作为影响步行效率的唯一显著变量（R2 = 0.81）。
我们的研究结果表明，在步态中控制质心垂直运动的康复计划对于提高THA术后早期的步行能力很重要。
