I know that there is a product specifically for your symptoms, Bayikang Intermediate Frequency Physiotherapy Instrument, which is used in the hospital and has a good effect on arthritis tenosynovitis. My back pain is also their home, and it eased after a few days. The effect is quite good. You can buy genuine products in the flagship store. I hope it works for you. It is very useful for complications such as cervical spondylosis, scapulohumeral periarthritis and lumbar muscle strain. The principle of intermediate frequency therapeutic instrument is that physical therapy instrument sends out. It can promote blood circulation and dredge collaterals, directly stimulate sympathetic nerve, dilate blood vessels, promote blood circulation, improve local blood supply nutrition, improve tissue vitality, accelerate the excretion of metabolic waste, and achieve the effects of anti-inflammation and improving tissue vitality. Achieve the purpose of diminishing inflammation, relieving pain and swelling, and stimulate neuromuscular, produce exercise effect, so as to achieve the effect of relieving fatigue. A good physiotherapy instrument can relieve pain, diminish inflammation and reduce swelling, promote blood circulation and achieve medical effect. Beiyikang's products have these functions, and it is a professional medium-frequency physiotherapy instrument enterprise with a good reputation. Baidu also has a lot of related information. Their products are aimed at shoulder, neck, waist, leg and other complications, and can play a good role in relieving pain, diminishing inflammation, reducing swelling and promoting blood circulation for your lumbar muscle strain. I bought their products before, and they are not bad. You can refer to them.