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| sacroiliac joint | |
|---|---|
| Name | Sacroiliac joint |
| Latin | Articulatio sacroiliaca |
| System | Skeletal system |
sacroiliac joint The sacroiliac joint connects the sacrum and the ilium of the pelvis and is integral to load transfer between the spine and lower limbs, with complex ligamentous support and variable mobility. It has a key role in human posture and gait as recognized in comparative studies of Homo sapiens evolution and in clinical practice across specialties such as orthopedics, rheumatology, and physical therapy. Research from institutions like Mayo Clinic, Johns Hopkins Hospital, Cleveland Clinic, Massachusetts General Hospital and academic centers including Harvard University, Stanford University, University of Oxford, University of Cambridge and University of Toronto informs modern understanding and management strategies.
The joint is formed where the posterior surface of the ilium meets the lateral aspect of the sacrum beneath the lumbar vertebrae, with articular surfaces variably planar or irregular and reinforced by strong ligaments such as the anterior and posterior sacroiliac ligaments, the interosseous sacroiliac ligament and the sacrotuberous and sacrospinous ligaments, concepts taught in curricula at King's College London, University College London, Columbia University and Yale University. Surfaces are lined by a synovial membrane on the anterior portion and fibrocartilage on the posterior portion, a detail emphasized in anatomical atlases from Gray's Anatomy, Netter and the American Association of Anatomists. Innervation is primarily from branches of the dorsal rami and the lumbosacral plexus, an area of study in departments at Johns Hopkins University School of Medicine, UCL Queen Square Institute of Neurology and University of California, San Francisco.
Functionally the joint transmits axial loads from the weight-bearing pelvis and lower limbs to the axial skeleton and allows limited movements—nutation and counternutation—critical for activities such as walking, running, childbirth and athletic maneuvers analyzed by research centers including The Sports Medicine Research Center at Boston University, University of Sydney, Karolinska Institutet and McMaster University. Biomechanical models developed at Massachusetts Institute of Technology, California Institute of Technology, ETH Zurich and Imperial College London quantify force distribution and the stabilizing role of ligaments and surrounding musculature including the gluteus maximus, multifidus and iliacus, with implications for prosthetics and orthotic design studied at Stanford University and Technical University of Munich.
Clinically, pathology of the joint contributes to low back pain and pelvic girdle pain encountered by practitioners at facilities such as Mount Sinai Hospital, Karolinska University Hospital, Singapore General Hospital and Royal Melbourne Hospital and is relevant to specialties including obstetrics in centers like Guy's and St Thomas' NHS Foundation Trust and University of California, Los Angeles. Sacroiliac joint disorders intersect with systemic conditions such as ankylosing spondylitis, psoriatic arthritis, reactive arthritis and metabolic bone disease investigated at National Institutes of Health, World Health Organization and research programs at University of Pennsylvania and Oxford University Hospitals. The joint is also implicated in post-traumatic instability after pelvic fractures treated at trauma centers like R Adams Cowley Shock Trauma Center and Sheba Medical Center.
Dysfunction arises from inflammatory, degenerative, traumatic, infectious and pregnancy-related causes; common etiologies include ankylosing spondylitis, degenerative osteoarthritis, pelvic fracture, pregnancy-related pelvic girdle pain and septic arthritis, topics explored in clinical trials at Cochrane Collaboration, National Institute for Health and Care Excellence and European League Against Rheumatism. Distinctions are made between hypermobility and hypomobility, primary osteoarthritic change, inflammatory spondyloarthropathies and traumatic disruptions seen in victims of high-energy injuries treated at centers such as Royal London Hospital and St. Thomas' Hospital.
Diagnosis integrates history, physical examination maneuvers (e.g., FABER, compression and distraction tests), image modalities including plain radiography, computed tomography and magnetic resonance imaging performed with protocols from Radiological Society of North America and guided by expert panels at American College of Radiology and European Society of Radiology, and diagnostic blocks or injections under fluoroscopic or ultrasound guidance as practiced at Mayo Clinic and Cleveland Clinic. Differential diagnosis includes lumbar disc herniation, hip joint pathology, pelvic floor dysfunction and referred pain syndromes evaluated in multidisciplinary clinics at Johns Hopkins Medicine and UCLA Health.
Management ranges from conservative care—activity modification, nonsteroidal anti-inflammatory drugs, physical therapy programs designed at Boston Children's Hospital and Hospital for Special Surgery—to interventional procedures such as image-guided corticosteroid injections, radiofrequency ablation, prolotherapy and surgical fusion techniques developed at Mayo Clinic, Hospital for Special Surgery, Massachusetts General Hospital and specialized centers like Barrow Neurological Institute. Biologics and disease-modifying therapies are indicated for underlying inflammatory spondyloarthropathies following guidelines from American College of Rheumatology and European Alliance of Associations for Rheumatology.
Rehabilitation emphasizes core stabilization, targeted strengthening of the gluteal muscles and lumbar stabilizers, gait retraining and ergonomic modifications endorsed by programs at National Health Service physical therapy services, World Health Organization occupational health initiatives and sports medicine units at Australian Institute of Sport and Aspetar. Preventive strategies include prenatal exercise protocols promoted by Royal College of Obstetricians and Gynaecologists, workplace interventions advocated by Occupational Safety and Health Administration and conditioning regimens used by professional teams such as FC Barcelona, New York Yankees and All Blacks to reduce risk of recurrence and functional impairment.
Category:Joints of the lower limb