Hello,
It is unlikely that joint pains or arthritis can occur in the joints of only one side of the body.
Since the problem with your hips started after the birth of your child, I believe that it is spinal in origin. A lot of stress is placed on the lower spine during late pregnancy and delivery, especially in the position in which you have to be in during the delivery. A herniated spinal disc is known to occur at this time.
Either a spinal disc or a misaligned muscle or ligament can put pressure on the sciatic nerve at this point. Even if you do not have pain radiating down your buttocks, you do have pain radiating down the front of the thigh. Although the pain in your knee can be due to arthritis, i feel that Sciatica cannot be ruled out.
I feel that you should ask for an Xray fo the spine as well as a NVC test of the sciatic nerve.
And, yes, treatment of pain due to sciatica does not help much. Physiotherapy and painkillers are the only options available .
I wish I could have helped you more.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology