This pain is definitely something that you need to get checked out. I recommend going to talk with your primary care doctor
or, if you have one, your orthopedic doctor.
It is not clear from your question how old you are. However, in older adults, wear and tear arthritis in the hip joint (also known as osteoarthritis) is a serious and common problem. Therefore, if you are getting up there in years, this would be the first thing I would think of. Pain in the groin and knee could all be caused by a hip problem, as pain from the hip often will radiate out to those locations. Your doctor will probably want to start by getting some plain x-rays of the hip and pelvis, as these can often help make a diagnosis of arthritis and rule out other common problems. It may also be worthwhile to have your scoliosis
reevaluated, as sometimes progressive scoliosis will cause progressive back pain, which may also radiate down and involve the hip.
In addition to helping diagnose the problem, your doctor will be able to give you advice on treatment options, which could include anti-inflammatory medications, physical therapy or, even, surgery
in more advanced cases. Make an appointment with your primary care doctor or your orthopedic doctor today.