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The release of aggrecan fragments into synovial fluid after joint injury and in osteoarthritis
Aggrecan fragments are released from human joint cartilage matrix into joint fluid after injury and in osteoarthritis (OA). The temporal patterns of release agree with changes in synthesis and degradation of aggrecan found in experimental animal models of OA. However, we are far from being able to use these molecular fragments to monitor human OA. The structures of the aggrecan fragments remaining
Molecular markers to monitor outcome and intervention in osteoarthritis (promises, promises...)
Design and conduct of clinical trials in patients with osteoarthritis : Recommendations from a task force of the Osteoarthritic Research Society
Procollagen II C-propeptide in joint fluid : Changes in concentration with age, time after knee injury, and osteoarthritis
Objective. To determine in a cross sectional study the concentrations in joint fluid of the C-propeptide of collagen II (pCol II-C) in patients with knee injury and developing osteoarthritis (OA). Methods. Synovial fluid (SF) samples were collected from knees of healthy volunteers, from patients with injury to the knee causing lesions of the anterior cruciate ligament and/or menisci, and from pati
Intra-articular hyaluronan injections in the treatment of osteoarthritis of the knee : A randomised, double blind, placebo controlled multicentre trial
Objective - To assess the effects of intraarticular injections of hyaluronan on symptoms of knee osteoarthritis (OA). Methods - Two hundred and forty patients with symptomatic, radiological knee OA were randomly assigned to treatment with weekly injections for five weeks with either 25 mg of high molecular weight hyaluronan or vehicle. Results were evaluated at weeks 1, 2, 3, 4, 5, 13, and 20 by v
No title
Division of flexor tendons causes progressive degradation of tendon matrix in rabbits
Deep flexor tendons of 30 rabbits were divided at the ankle level. The effects of unloading on the synthesis and content of matrix components, the synthesis of DNA, and dry weight were investigated. The reaction of the fibrocartilaginous and non-fibrocartilaginous segments were separately analyzed. The ability of the tendons to synthesize collagen during short-term culture and the contents of matr
Differential effects of insulin-like growth factor-I on matrix and DNA synthesis in various regions and types of rabbit tendons
Tendon healing and integration of tendon grafts may be site or donor specific. To determine if differences exist in sensitivity to growth factors that have the potential to influence tendon repair, we compared the effect of recombinant human insulin-like growth factor-1 on various types of tendon segments. The dose response effects on proteoglycan, collagen, noncollagen protein, and DNA synthesis
Increased concentrations of bone sialoprotein in joint fluid after knee injury
Objective - To detect evidence for localised changes in bone matrix metabolism after joint trauma and in post-traumatic osteoarthritis by quantification of bone sialoprotein in joint fluid and serum after knee injury in a cross sectional study. Methods - Samples of knee joint fluid and serum were obtained from volunteers with normal knees (n = 19), patients with rupture of the anterior cruciate li
What is the current status of biochemical markers in the diagnosis, prognosis and monitoring of osteoarthritis?
Biochemical markers for osteoarthritis (OA) may serve different purposes. Since markers reflect ongoing dynamic metabolic processes in the joint tissues (cartilage, synovium, bone, etc.), they are most likely to be useful to predict prognosis and response to treatment, to monitor response to treatment, and for disease staging. Markers are currently being used at the research level for these purpos
Aggrecan degradation in human cartilage : Evidence for both matrix metalloproteinase and aggrecanase activity in normal, osteoarthritic, and rheumatoid joints
To examine the activity of matrix metalloproteinases (MMPs) and aggrecanase in control and diseased human articular cartilage, metabolic fragments of aggrecan were detected with monospecific antipeptide antibodies. The distribution and quantity of MMP-generated aggrecan G1 fragments terminating in VDIPEN341 were compared with the distribution of aggrecanase-generated G1 fragments terminating in NI
Magnetic resonance imaging, scintigraphy, and arthroscopic evaluation of traumatic hemarthrosis of the knee
Forty patients with traumatic knee hemarthrosis were examined within 1 week after injury and observations made with magnetic resonance imaging, scintigraphy, arthroscopic evaluation, radiography, and physical examination were compared. Thirty-four patients (85%) had anterior cruciate ligament injuries according to the arthroscopic findings and 28 (83%) of these had associated meniscal tears. Magne
Increased levels of proteoglycan fragments and stromelysin in hip joint fluid in Legg-Calve-Perthes disease
The concentrations of proteoglycan fragments and stromelysin were analyzed in joint aspirates in 19 children with Legg-Calve-Perthes disease. We found increased levels of proteoglycan fragments and stromelysin consistent with the presence of synovitis, an important clinical and possibly also prognostic factor in these children.
Defining the role of molecular markers to monitor disease, intervention, and cartilage breakdown in osteoarthritis
Osteoarthritis (OA) is associated with a loss of the normal balance between synthesis and degradation of the macromolecules that provide articular cartilage with its biomechanical and functional properties. The destruction of joint cartilage involves the degradation of matrix molecules which are released as fragments to joint fluid, blood, and urine, where they may be detected, for example, by imm
Elevated levels of synovial fluid PLA2, stromelysin (MMP-3) and TIMP in early osteoarthrosis after tibial valgus osteotomy in young beagle dogs
We determined the concentration of markers in cartilage and synovium metabolism in the synovial fluid (SF) of the knee of young beagle dogs with slowly progressive osteoarthrosis. Osteoarthrosis (OA) was induced by a tibial 30°valgus osteotomy to the right hindlimb of 16 dogs. The contralateral knee served as control. The animals were killed 7 (group I) and 18 months (group II) after operation. Th
No title
Osteoarthritis of the knee is not a well defined illness, but is a result of different causes that may lead to joint failure due to chondral damage, synovial inflammation, subchondral bone formation, and the formation of osteophytes along the joint lines. The pathogenesis is unclear. We still lack treatment to cure the early prosess of chondral degeneration. The treatment of choice in early and mo
Knee injury and Osteoarthritis Outcome Score (KOOS) - Validation of a Swedish version
The Knee injury and Osteoarthritis Outcome Score (KOOS) is a self-administered instrument measuring outcome after knee injury at impairment, disability, and handicap level in five subscales. Reliability, validity, and responsiveness of a Swedish version was assessed in 142 patients who underwent arthroscopy because of injury to the menisci, anterior cruciate ligament, or cartilage of the knee. The
Knee Injury and Osteoarthritis Outcome Score (KOOS) - Development of a self-administered outcome measure
There is broad consensus that good outcome measures are needed to distinguish interventions that are effective from those that are not. This task requires standardized, patient-centered measures that can be administered at a low cost. We developed a questionnaire to assess short- and long-term patient-relevant outcomes following knee injury, based on the WOMAC Osteoarthritis Index, a literature re
Longitudinal and cross-sectional variability in markers of joint metabolism in patients with knee pain and articular cartilage abnormalities
Objective: To determine the within- and between-patient variability in the concentrations of synovial fluid, serum and urine markers of joint tissue metabolism in a cohort of patients with knee pain and cartilage changes consistent with early-stage knee osteoarthritis. Design: Samples of synovial fluid, serum, and urine were obtained from 52 patients on eight different occasions during 1 year, as
