Chinese Journal of Rehabilitation Theory and Practice ›› 2025, Vol. 31 ›› Issue (5): 613-620.doi: 10.3969/j.issn.1006-9771.2025.05.015

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Lower limb coordination and variability in children with spastic cerebral palsy during flat ground walking: a vector coding technique study

CHEN Chuanyi1, QI Liuxin1, LI Aihua2, NI Yan2, SUN Wei1, WANG Jiangna1()   

  1. 1. Shandong Sport University, Ji'nan, Shandong 250102, China
    2. Ji'nan Hospital, Ji'nan, Shandong 250013, China
  • Received:2024-10-22 Revised:2025-03-10 Published:2025-05-25 Online:2025-05-26
  • Contact: WANG Jiangna, E-mail: tsjywjn2018@126.com
  • Supported by:
    National Natural Science Foundation of China(12402373);Shandong Natural Science Foundation(ZR2024MH341)

Abstract:

Objective To quantify the lower limb coordination and coordination variability of children with spastic cerebral palsy (CP) during flat ground walking using vector coding technology.
Methods From September to December, 2023, eight children with spastic CP (patients) from Ji'nan Rehabilitation Hospital and Ji'nan Special Education School, and eight healthy children (controls) from communities walked on a treadmill at a speed of 0.45 m/s. Lower limb kinematic data were collected using Vicon, a three-dimensional motion capture system. Vector coding technology was used to quantify the temporal and spatial parameters of ipsilateral lower limb joints to calculate joint coupling angles and coupling angle variability (CAV).
Results In the first and second double support phase, the hip-knee coupling angle was significantly larger in the patients than in the controls (|t| > 2.317, P < 0.05). In the swing phase, the hip-ankle and knee-ankle coupling angles were significantly larger in the patients (|t| > 2.346, P < 0.05). In the first double support phase and the single support phase, CAV of the hip-knee and hip-ankle were significantly larger in the patients (|t| > 2.454, P < 0.05), and they were smaller in the swing phase (t > 2.560, P < 0.05). In the second double support phase and the swing phase, CAV of the knee-ankle was significantly larger in the patients (|t| > 2.909, P < 0.05).
Conclusion Coordination among hip, knee and ankle joints is poor for children with spastic CP during both the stance and swing phases of walking, and variability is more during the stance phase.

Key words: spastic cerebral palsy, gait, coordination, vector coding

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