Department of Radiation Sciences, Radiation Physics and Biomedical Engineering, Umeå University, SE-901 87 Umeå, Sweden.
Department of surgical and perioperative sciences, Umeå university, SE-901 87 Umeå, Sweden.
Sensors (Basel). 2019 Jul 23;19(14):3240. doi: 10.3390/s19143240.
A hip prosthesis design with larger femoral head size may improve functional outcomes compared to the conventional total hip arthroplasty (THA) design. Our aim was to compare the range of motion (RoM) in lower body joints during squats, gait and stair walking using a wearable movement analysis system based on inertial measurement units (IMUs) in three age-matched male groups: 6 males with a conventional THA (THAC), 9 with a large femoral head (LFH) design, and 8 hip- and knee-asymptomatic controls (CTRL). We hypothesized that the LFH design would allow a greater hip RoM, providing movement patterns more like CTRL, and a larger side difference in hip RoM in THAC when compared to LFH and controls. IMUs were attached to the pelvis, thighs and shanks during five trials of squats, gait, and stair ascending/descending performed at self-selected speed. THAC and LFH participants completed the Hip dysfunction and Osteoarthritis Outcome Score (HOOS). The results showed a larger hip RoM during squats in LFH compared to THAC. Side differences in LFH and THAC groups (operated vs. non-operated side) indicated that movement function was not fully recovered in either group, further corroborated by non-maximal mean HOOS scores (LFH: 83 ± 13, THAC: 84 ± 19 groups, vs. normal function 100). The IMU system may have the potential to enhance clinical movement evaluations as an adjunct to clinical scales.
一种大头股骨头髋关节假体设计可能比传统全髋关节置换术（THA）设计更能改善功能结果。我们的目的是通过基于惯性测量单元（IMU）的可穿戴运动分析系统，比较三组年龄匹配的男性（6 名接受传统 THA（THAC）治疗的男性、9 名接受大头股骨头（LFH）设计治疗的男性和 8 名髋关节和膝关节无症状的对照组男性）在下蹲、行走和上下楼梯时下肢关节的运动范围（RoM）。我们假设 LFH 设计将允许更大的髋关节 RoM，提供更类似于 CTRL 的运动模式，并且与 LFH 和对照组相比，THAC 中的髋关节 RoM 左右侧差异更大。在以自我选择的速度进行五次下蹲、行走和上下楼梯试验期间，将 IMU 附着在骨盆、大腿和小腿上。THAC 和 LFH 参与者完成髋关节功能和骨关节炎结果评分（HOOS）。结果表明，在下蹲时 LFH 组的髋关节 RoM 大于 THAC 组。LFH 和 THAC 组（手术侧与非手术侧）的侧方差异表明，两个组的运动功能都没有完全恢复，HOOS 平均得分非最大值（LFH：83 ± 13，THAC：84 ± 19 组，而正常功能为 100）进一步证实了这一点。IMU 系统可能有潜力通过附加临床量表来增强临床运动评估。
