Ultrasound-guided platelet-rich plasma injection improves pain, function and symmetry in lumbar myofascial pain syndrome: A case report

Table 3 After ultrasound guided injection of platelet-rich plasma, the surface electromyography data of bilateral quadratus lumborum muscles showed that the bilateral muscle function gradually regained symmetry

	Baseline	1 month	3 months	6 months
Left Aemg	28.74	23.17	24.59	25.71
Left iemg	83.64 ± 7.51	59.49 ± 4.63	61.12 ± 8.12	73.73 ± 11.41
Left RMS	35.77 ± 1.88	28.96 ± 2.50	30.79 ± 0.97	32.01 ± 1.30
Left MF	63.60	87.29	80.06	68.52
Right Aemg	40.76	27.82	26.95	26.91
Right iemg	112.47 ± 8.39	68.87 ± 6.27	69.37 ± 6.69	75.48 ± 9.79
Right RMS	51.36 ± 2.94	34.86 ± 1.63	33.84 ± 1.16	33.53 ± 1.03
Right MF	88.20	85.17	83.20	70.48

Aemg: Average electromyographic; iemg: Integral electromyography; RMS: Root mean square electromyography; MF: Median frequency.