I reckon as well as some kind of sacroiliac joint dysfunction and or an alignment problem being the cause of your wifes problem its also possible that your wife suffers from some kind of rheumatological condition like ankylosing spondylitis these types of conditions have recently become much easier to treat due to the use of new drugs i copied and pasted this.
Sacroiliitis is an inflammation of one or both of the sacroiliac joints, which connect your lower spine and pelvis. With sacroiliitis, even the slightest movements of your spine can be extremely uncomfortable or even painful for you.
Sacroiliitis can be difficult to diagnose, and it may be mistaken for other causes of low back pain, including sciatica, herniated disks and strained muscles. Sacroiliitis may be associated with a group of diseases called spondyloarthropathies, which cause inflammatory arthritis of the spine.
Treatment for sacroiliitis may involve a combination of you resting, receiving physical therapy and taking medications.
and this.
The inflammatory arthritides included in the category of spondyloarthropathy (ankylosing spondylitis, psoriatic arthritis, reactive arthritis, undifferentiated spondyloarthropathy, and arthritis associated with inflammatory bowel disease) may cause significant, progressive morbidity. Therapy with nonsteroidal antiinflammatory drugs and traditionally used disease-modifying antirheumatic drugs, such as methotrexate, often fails in patients with more severe peripheral arthropathy and axial involvement, and alternative treatment options have been limited. With increased understanding of the pathologic processes involved in these disorders, new therapeutics have arisen and are being investigated in the various subtypes of spondyloarthropathy. This article reviews recent progress in disease-modifying therapy for spondyloarthropathy, including new biologic response modifiers, such as the tumor necrosis factor- inhibitors etanercept and infliximab.
Introduction
The spondyloarthropathies are a group of rheumatic disorders distinct from rheumatoid arthritis that involve chronic inflammation of joints, with or without extraarticular features. Included are the clinical syndromes of ankylosing spondylitis (the prototypic disorder), psoriatic arthritis, reactive arthritis, undifferentiated spondyloarthropathy, and arthritis associated with chronic inflammatory bowel disease. Because of the overlapping clinical features of these disorders, clinical presentation often determines treatment strategy.
sorry its so technical i cant find anything that is more straight forward at the moment.