Hamstring tightness can be most likely cause of your symptoms. This may have been developed secondary due to knee pain. Back, hip and knee work in an integrated fashion and muscles are common for these joints. So one joint affects the other joints. The treatment is;
1) Physical therapy
3) Mild massage
4) Deep electrotherapy done at physical therapy centers.
Please see the resource for the exercises;
The other possibility to look for would be pinched nerves in the back, which may cause this radiculopathy pain. This can be due to;
1) Herniated/degenerated disc in back
2) Lumbar spondylosis; bone spurs in the back vertebrae pressing on the nerves.
Following investigations would be required;
1) X-ray of the lower back
2) MRI of the spine
3) Nerve conduction velocity (NCV) study
4) Electromyography (EMG)
Following measures may help:
Good supervised physiotherapy: The exercises consist of abdominal bracing, modified sit-ups, double-knee-to-chest or low back stretches, seat lifts, mountain and sag exercises, knee-to-elbow exercises, hamstring stretches, extension exercises, and extension flexibility exercises. Swimming exercises (pool exercises) are best. Initial stretching and later strengthening exercises are taught.
This is a slide show for the exercises (you can pick up your own set, which suits you);
You can consult following specialists (apart from your GP);
b) MD in Physical medicine and rehabilitation
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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