Research Progress on Characteristics of Lower Limb Movement Patterns and Rehabilitation Treatment of Patellofemoral Pain Syndrome / 医用生物力学

Patellofemoral pain syndrome (PFPS) has been attracting more and more attention in the field of rehabilitation treatment due to its high incidence rate and low cure rate. Researches show that the abnormal anatomy, muscle activity changes due to pain and insufficient muscle strength in patients with PFPS can cause wrong movement patterns of lower limb joints, which will lead to aggravation of the disease and is not conducive to the rehabilitation of patients. Movement patterns of the hip, knee, ankle joints can be improved by exercise therapy, taping, neuromuscular training and joint orthosis, thus to reduce the pain. In this paper, the movement pattern characteristics of patients with PFPS and the corresponding rehabilitation treatment method were summarized, so as to provide references for the rehabilitation of PFPS.

Influence of knee extension in sitting position with hip adduction on surface EMG of quadriceps muscles in patients with patellofemoral pain syndrome / 医用生物力学

Objective To investigate the possible effect of fully knee extension in sitting position with or without hip adduction on quadriceps imbalance in patients with patellofemoral pain syndrome (PFPS) by using surface electromyography (sEMG). Methods sEMG signals of vastus lateralis (VL) and vastus medialis oblique (VMO) muscles from 30 patients with PFPS as PFPS group and 30 healthy subjects as control group were collected, during their fully knee extension in sitting position with or without hip adduction. All the EMG data were then analyzed by extracting time domain indexes, namely, the root mean square (RMS) and integrated EMG (IEMG), to compare the balanced relationship between VL and VMO muscles. Results In PFPS group, there were no significant differences in VL time domain indexes during knee extension in sitting position with or without hip adduction, while statistical differences were found in VMO time domain indexes, and values of RMS and IEMG of VMO were higher under hip adduction, which indicated that the VMO muscle recruitment was strengthened. Conclusions Fully knee extension in sitting position with hip adduction can promote EMG activities of VMO muscles in patients with PFPS, which will help to balance the VL and VMO muscles.