Effects of Repetitive Peripheral Magnetic Stimulation Over Vastus Lateralis in Patients After Hip Replacement Surgery

Abstract

ObjectiveTo investigate the effects of repetitive peripheral magnetic stimulation (rPMS) on the vastus lateralis (VL) in the early stage after hip replacement surgery.MethodsTwenty-two patients who underwent hip replacement after proximal femur fracture were included in this study. After hip surgery, the experimental group was applied with 15 sessions of 10 Hz rPMS over the VL 5 times per week for 3 weeks, while the control group took sham stimulation. All patients were also given conventional physical therapy. The VL strength was measured with the root mean square (RMS) value of the VL with surface electromyography technique. The ratio of RMS values between fractured and unfractured legs and tandem stand test were used to assess standing balance. Usual gait speed was measured to evaluate gait function. Pain in two groups was assessed with visual analog scale (VAS).ResultsBoth RMS value of the VL and the ratio of RMS values after rPMS were significantly improved (p<0.05). Also, tandem standing time and usual gait speed in rPMS group were dramatically increased (p<0.05). However, no significant difference in VAS was found between the two groups after 3 weeks.ConclusionrPMS on the VL improved muscle strength, standing balance and gait function in the early stage after hip surgery. Therefore, rPMS could be applied to patients who cannot take electrical stimulation due to pain and an unhealed wound.

Modulation of the Corticomotor Excitability by Repetitive Peripheral Magnetic Stimulation on the Median Nerve in Healthy Subjects

“…By contrast, no significant improvement in muscle strength was observed in the other untreated muscles and in the opposite arm which received sham stimulation. Besides, rPMS applied to certain muscles for 15–24 sessions in a period of 3–8 weeks also enhanced the muscle strength for several other conditions that may lead to muscle weakness such as COPD (Bustamante et al, 2010 ) as well as post-operation muscle weakness (Baek et al, 2018 ). The lack of improvement in handgrip strength after rPNMS on the median nerve in the present study might be due to the minimum dose administered in one single session.…”

Clinical Application of Repetitive Peripheral Magnetic Stimulation in Rehabilitation

“…rPMS has the advantage of not causing pain and has been used in clinical practice with the expectation of functional recovery in some cases. Beck et al [15] studied the effect of early intervention with rPMS on the vastus lateralis muscle after hip replacement surgery. The subjects were patients who underwent hip replacement after a proximal femur fracture.…”

Measurement of maximal muscle contraction force induced by high-frequency magnetic stimulation: a preliminary study on the identification of the optimal stimulation site

“…have not yet been identified. Therefore, the purpose of this preliminary study was to confirm whether a strong muscle contraction can be obtained when the probe is placed on the distal or central part of the vastus lateralis (VL), which is the largest muscle in the quadriceps femoris (QF) and has been examined in many previous studies [12,13]. The muscle contraction forces in both sections were compared when maximal magnetic stimulation was applied.…”