Hello and welcome to HCM.
Thanks for putting your query over here.
You need to mention your age so that I provide you with better information.
Backache along with pain that radiates from lower lumbar to hips and legs can be because of pinched nerve at your
lumbar spine.
I advise you to get a clinical eamination done from orthopaedician.If required,MRI scan of spine may be needed.
This pain can be dealth with analgesics like ibuprofen or acetamiophen twice a day for couple of days.Local massage and warm compress may reduce the pain.
Strength training and muscle relaation eercises with consultation from physical therapist will give relief.
Dairy products,green leafy vegetables,fruits and
Calcium supplements will add to the bone health.
Still if the problem persists,
local steroid injections or higher level pain killers will be prescribed.
So far pain at other joints and weakness is considered,I advise you to get investigations like haemogram.anti
rheumatoid factor,anti nuclear antiibodies tested to rule out
autoimmune disease.
Hope I answered your query.
Any further query is welcome.