Strong quadriceps may benefit those with knee osteoarthritis
Biochemists at North Carolina State University have answered a fundamental question of how important bacterial proteins make life-and-death decisions that allow them to function, a finding that could provide a new target for drugs to disrupt bacterial decision-making processes and related diseases. In a study published this month in the journal Structure, the NC State
Full Post: Scientists present ‘moving’ theory behind bacterial decision-making
Studies on the influence of quadriceps strength on knee osteoarthritis (OA), one of the leading causes of disability among the elderly, have shown conflicting results.
In some studies, decreased quadriceps strength is associated with greater knee pain and impaired function, while other studies show mixed results on the effect of quadriceps strength on the structural progression of knee OA.
Most studies to date have used X-rays to indirectly measure cartilage loss in knee OA and have focused on the tibiofemoral joint (the main joint in the knee where the thigh and shin bones meet). A new study has examined the effect of quadriceps strength on cartilage loss (measured using magnetic resonance imaging [MRI]) at both the tibiofemoral joint and the patellofemoral joint (where the thigh bone and knee cap meet) as well as on knee OA symptoms. The study was published in the January issue of Arthritis & Rheumatism.
Led by Shreyasee Amin, M.D., M.P.H., of the Mayo Clinic, the study involved 265 men and women participating in a 30-month study of symptomatic knee OA. At the beginning of the study, participants underwent MRI of their more painful knee and measurement of quadriceps strength for the same knee. They were also asked to rate the severity of their knee pain and their physical function was assessed. The knee MRI and assessments of their knee OA symptoms were repeated at 15 and 30 months. A measurement of knee alignment was also performed.
The results showed that greater quadriceps strength had no influence on cartilage loss at the tibiofemoral joint even in those with knees that were out of alignment. However, stronger quadriceps were shown to protect against cartilage loss in the lateral compartment (outer part) of the patellofemoral joint, a site of frequent cartilage loss, pain and disability in patients with knee OA. The study also showed that those with the greatest quadriceps strength had less knee pain and better physical function than those with the least strength.
Previous studies had also shown no overall protective effect of greater quadriceps strength on cartilage loss at the tibiofemoral joint. The protective effect against cartilage loss at the lateral compartment of the patellofemoral joint is a new finding that needs to be confirmed in future studies, but does provide evidence as to the benefit of having strong quadriceps muscles in patients with knee OA. “Our findings, which also include an association of greater quadriceps strength with less knee pain and physical limitation over followup, suggest that greater quadriceps strength has an overall beneficial effect on symptomatic knee OA,” the authors state. This effect may be due to a strengthening of the vastus medialis obliquus (a quadriceps muscle that pulls the kneecap inward), that may stabilize the kneecap and help prevent cartilage loss behind part of the knee cap.
Although the study did not involve exercise training to strengthen the quadriceps, there have been several short-term studies that show that improving quadriceps strength has a beneficial effect on knee pain and function. “While our findings suggest that maintaining strong quadriceps is of benefit to those with knee OA, further work is needed to determine the type and frequency of exercise regimen that will be both safe and effective,” the authors conclude.
Rush University Medical Center is the only hospital in Illinois - and one of only a few nationwide - using cartilage transplants to repair damaged shoulder joints. “For a long time surgeons have been looking for an alternative to joint replacement that is more effective than simply cleaning out the joint arthroscopically. In cartilage restoration,
Full Post: Cartilage transplants used to repair damaged shoulder joints
The scientists describe their work in this week’s Early Edition of the Proceedings of the National Academy of Sciences. In the study, the team shows how the loss of the protein HMGB2, found in the surface layer of joint cartilage, leads to the progressive deterioration of the cartilage that is the hallmark of osteoarthritis. “We
Full Post: Discovery of cause of cartilage degeneration in osteoarthritis
Iliotibial Band or IT band syndrome is one of the most commonly caused injuries amongst the runners. It happens when the IT band which runs down on the outside part of the thigh from the hip portion to the shin portion is inflamed or tightened. When this Iliotibial Band does not work properly, the knee
Full Post: Iliotibial Band Syndrome
Birth defects characterized by malformation of the limbs are relatively common. New insight into one form of the birth defect synpolydactyly, where individuals have 1 or more digit (finger or toe) duplicated and 2 or more digits fused together, has now been provided by Stefan Mundlos and colleagues, at Universit?medizin Berlin, Germany, who studied a
Full Post: New insight into birth defect synpolydactyly
Genzyme Corporation has announced that its Premarket Approval (PMA) application supplement for Synvisc-One (hylan G-F 20) will be discussed this Tuesday, December 9th, at a public meeting of the FDA’s Orthopaedic and Rehabilitation Devices Advisory Committee in Gaithersburg, Maryland. The panel is expected to consider the clinical trial results Genzyme submitted to support the approval
Full Post: FDA advisory committee to dscuss PMA for Genzyme’s Synvisc-One