Line of Klein | |
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Radiogram of slipped capital femoral epiphysis |
Klein's line or the line of Klein is a virtual line that can be drawn on an X-ray of an adolescent's hip parallel to the anatomically upper edge of the femoral neck. It was the first tool to aid in the early diagnosis of a slipped capital femoral epiphysis (SCFE), which if treated late or left untreated leads to crippling arthritis, leg length discrepancy and lost range of motion. It is named after the American orthopedic surgeon Armin Klein at Harvard University, who published its description and usefulness in 1952. Subsequent modification of its use has increased the sensitivity and reliability of the tool.
Klein's line is a virtual line that can be drawn on an X-ray of a child's hip parallel to the upper edge of the femoral neck. If the line does not intersect with the outermost part of the femoral head 's ball-like end, the diagnosis of a slipped capital femoral epiphysis (SCFE) is confirmed. [1]
Klein's line is named after the orthopaedic surgeon Armin Klein (1892–1954), Chief of Orthopaedic Services at the then newly opened Beth Israel Hospital of Boston [2] for his observations presented to the American Academy of Orthopaedic Surgeons in 1951 and published in 1952. [3] Klein and three colleagues at Massachusetts General Hospital had seen the crippling effects in later life for a person with slipped capital femoral epiphysis; they were convinced that early diagnosis in childhood and "prophylactic procedures" were needed to treat the condition. [3] : 233 The diagnosis was up until then made by comparing the X-ray of the suspected epiphysis with the "normal" hip on the opposite side, which in Klein's series had left 11 of 38 children undiagnosed. [3] : 234 In children with the condition they observed an abnormal alignment of the femoral head with the femoral neck on an X-ray taken from a frontal view of the hip joint and a side view taken with the child in the frog-leg position: "The proximal part of the femoral neck at its juncture with the epiphysis was left bare superiorly and anteriorly over an area equivalent to the amount of slipping of the head as much as in the 'normal' hip." [3] : 238
As early as 1957, [4] throughout the 1960s, [5] and into the end of the 20th century [6] surgeons have remarked on the number of missed diagnoses using the Klein's line.
In 2009, the classic definition of Klein's line was shown to miss 60% of SCFE cases on X-rays of 30 children between 8 and 16 years of age. [1] The sensitivity and reliability is improved by measuring the epiphyseal width lateral to Klein's line, which if differing by 2 millimetres (0.079 in) or more between hips suggests the diagnosis of SCFE. [1]
Legg–Calvé–Perthes disease (LCPD) is a childhood hip disorder initiated by a disruption of blood flow to the head of the femur. Due to the lack of blood flow, the bone dies and stops growing. Over time, healing occurs by new blood vessels infiltrating the dead bone and removing the necrotic bone which leads to a loss of bone mass and a weakening of the femoral head.
A limp is a type of asymmetric abnormality of the gait. Limping may be caused by pain, weakness, neuromuscular imbalance, or a skeletal deformity. The most common underlying cause of a painful limp is physical trauma; however, in the absence of trauma, other serious causes, such as septic arthritis or slipped capital femoral epiphysis, may be present. The diagnostic approach involves ruling out potentially serious causes via the use of X-rays, blood tests, and sometimes joint aspiration. Initial treatment involves pain management. A limp is the presenting problem in about 4% of children who visit hospital emergency departments.
Slipped capital femoral epiphysis is a medical term referring to a fracture through the growth plate (physis), which results in slippage of the overlying end of the femur (metaphysis).
Wayne Orin Southwick was an American surgeon and academic. He was the first chairman of the Department of Orthopaedics and Rehabilitation at Yale University from 1958 to 1979. Southwick trained more future orthopaedic chairmen than any other chairman in the history of orthopaedics.
Transient synovitis of hip is a self-limiting condition in which there is an inflammation of the inner lining of the capsule of the hip joint. The term irritable hip refers to the syndrome of acute hip pain, joint stiffness, limp or non-weightbearing, indicative of an underlying condition such as transient synovitis or orthopedic infections. In everyday clinical practice however, irritable hip is commonly used as a synonym for transient synovitis. It should not be confused with sciatica, a condition describing hip and lower back pain much more common to adults than transient synovitis but with similar signs and symptoms.
A Salter–Harris fracture is a fracture that involves the epiphyseal plate of a bone, specifically the zone of provisional calcification. It is thus a form of child bone fracture. It is a common injury found in children, occurring in 15% of childhood long bone fractures. This type of fracture and its classification system is named for Robert B. Salter and William H. Harris who created and published this classification system in the Journal of Bone and Joint Surgery in 1963.
Protrusio acetabuli is an uncommon defect of the acetabulum, the socket that receives the femoral head to make the hip joint. The hip bone of the pelvic bone/girdle is composed of three bones, the ilium, the ischium and the pubis. In protrusio deformity, there is medial displacement of the femoral head in that the medial aspect of the femoral cortex is medial to the ilioischial line. The socket is too deep and may protrude into the pelvis.
Hip resurfacing has been developed as a surgical alternative to total hip replacement (THR). The procedure consists of placing a cap, which is hollow and shaped like a mushroom, over the head of the femur while a matching metal cup is placed in the acetabulum, replacing the articulating surfaces of the person's hip joint and removing very little bone compared to a THR. When the person moves the hip, the movement of the joint induces synovial fluid to flow between the hard metal bearing surfaces lubricating them when the components are placed in the correct position. The surgeon's level of experience with hip resurfacing is most important; therefore, the selection of the right surgeon is crucial for a successful outcome. Health-related quality of life measures are markedly improved and the person's satisfaction is favorable after hip resurfacing arthroplasty.
Unicompartmental knee arthroplasty (UKA) is a surgical procedure used to relieve arthritis in one of the knee compartments in which the damaged parts of the knee are replaced. UKA surgery may reduce post-operative pain and have a shorter recovery period than a total knee replacement procedure, particularly in people over 75 years of age. Moreover, UKAs may require a smaller incision, less tissue damage, and faster recovery times.
Spontaneous osteonecrosis of the knee is the result of vascular arterial insufficiency to the medial femoral condyle of the knee resulting in necrosis and destruction of bone. It is often unilateral and can be associated with a meniscal tear.
Pigeon toe, also known as in-toeing, is a condition which causes the toes to point inward when walking. It is most common in infants and children under two years of age and, when not the result of simple muscle weakness, normally arises from underlying conditions, such as a twisted shin bone or an excessive anteversion resulting in the twisting of the thigh bone when the front part of a person's foot is turned in.
David Marsh Bosworth was an American orthopedic surgeon and medical educator. He is remembered for describing the Bosworth fracture.
Alan L. Schiller, M.D. is an American clinical pathologist and an expert in the effects of space and weightlessness on bone structure. Schiller has served on the Space Science Board of the Committee on Space Biology and Medicine of the National Academy of Sciences and as a member of the Life and Microgravity Sciences and Applications Advisory Committee of NASA. He currently serves on the board of directors of the National Space Biomedical Research Institute.
Orthopaedic Studio is an application designed to help orthopaedic specialists perform several common quantitative hip examinations that are based on standard x-ray images.
The Kocher criteria are a tool useful in the differentiation of septic arthritis from transient synovitis in the child with a painful hip. They are named for Mininder S. Kocher, an orthopaedic surgeon at Boston Children's Hospital and Professor of Orthopaedic Surgery at Harvard Medical School.
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Pain in the hip is the experience of pain in the muscles or joints in the hip/ pelvic region, a condition commonly arising from any of a number of factors. Sometimes it is closely associated with lower back pain.
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