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  • Racket sports rapidly...

Racket sports rapidly destroy cartilage in knee osteoarthritis in obese, finds MRI study

Dr. Kamal Kant KohliBy Dr. Kamal Kant KohliPublished On 2020-11-18T18:45:23+05:30  |  Updated On 2020-11-19T14:19:31+05:30
Racket sports rapidly destroy cartilage in knee osteoarthritis in obese, finds MRI study

OAK BROOK, Ill. - Knee joint osteoarthritis leads to gradual wearing down of the protective cartilage that cushions the ends of the bones causing pain and disability. Physical activity offers a host of benefits for people who are overweight, but the wrong type of exercise could potentially damage knee joints and hasten the need for knee replacement surgery.Researchers have found in a new...

OAK BROOK, Ill. - Knee joint osteoarthritis leads to gradual wearing down of the protective cartilage that cushions the ends of the bones causing pain and disability. Physical activity offers a host of benefits for people who are overweight, but the wrong type of exercise could potentially damage knee joints and hasten the need for knee replacement surgery.

Researchers have found in a new research that racket sports like tennis and racquetball appear to accelerate knee joint degeneration in overweight people with osteoarthritis. The study has been presented at the annual meeting of the Radiological Society of North America (RSNA).

The effects of different types of exercise on overweight people have seldom been studied with MRI, the most sensitive imaging method for assessing structural changes to the knee joint.

Forthe new study, researchers used high-powered MRI to assess the rate of degeneration of the knee joint in 415 overweight and/or obese patients, average age 59, drawn from the Osteoarthritis Initiative, a National Institutes of Health-supported study of individuals with mild to moderate osteoarthritis.

Study participants kept detailed records of their participation in six different types of physical activity, including ball sports, bicycling, jogging/running, elliptical trainer, racket sports and swimming. The researchers performed baseline MRIs and then measured changes in the patients' knees over four years using the modified Whole-Organ Magnetic Resonance Imaging Score (WORMS). A higher score indicates more degeneration.

Patients regularly participating in racket sports saw their overall WORMS score increase significantly, compared to patients regularly using the elliptical trainer over the study period. Surprisingly, the overall WORMS score also increased significantly in the racket sports group compared to the jogging/running group. Racket sports participants saw significantly greater degeneration in the medial tibial cartilage compartment, the compartment on the inside of the knee where arthritis often first appears.

Participants using the elliptical trainer showed the smallest changes in structural degeneration over four years.

"In our study, progression of overall knee joint degeneration was consistently higher in overweight and/or obese patients engaging in racket sports," said the study's lead author Silvia Schirò, M.D., from the University of California San Francisco and the University of Parma in Parma, Italy. "We also found that workouts using an elliptical trainer were associated with reduced progression of overall knee joint and cartilage defects. Moreover, our findings showed that when comparing different low impact activities with each other, such as bicycling, elliptical trainer and swimming, the elliptical trainer was associated with the lowest increase in WORMS sub-scores over 48 months.

"The more rapid degeneration of the knee joints in people who participated in racket sports is likely due to the high-speed lateral movements inherent to such sports, Dr. Schirò said. These movements can affect the femoral-tibia compartment, a structure in the knee made up of the femur condyle, the rounded end of the thighbone that helps it slide over the tibia, or shinbone, and the meniscus, the rubbery, C-shaped cartilage between the thighbone and the shinbone.

"A large lateral force imparted at the foot during side-to-side movements may be driving large knee adduction moments, a key feature in medial compartment disease, which imparts high compressive loads on the medial tibia and femoral condyle," she said. "In support of this premise, the racket sports group showed elevated cartilage degeneration in the medial tibia."

The researchers theorize that joint mechanics are impaired in overweight and obese individuals, with a harmful joint overload triggering increased contact stress on the meniscus. Damage to the meniscus compromises the protective cushion on the cartilage of the knee.

"High impact physical activity with elevated load and high shear forces may trigger and accelerate this process," Dr. Schirò said. "Moreover, participants who played racket sports showed significantly more meniscal degeneration when compared to the remainder of the study group."

The data suggests that overweight individuals who continue to play racket sports could slow degeneration in their knees by making modifications to their activities, such as switching to sports with less fast-paced and high shear loads like badminton or doubles tennis.

However, Dr. Schirò emphasized that the degenerative process is complex and individual joint mechanics are highly variable."

It is possible that some individuals with sufficient strength and motor control may be able to safely play these sports," she said. "Our data suggests that as a group, though, overweight and obese individuals who play racket sports are at higher risk for disease progression."

Annual meeting of the Radiological Society of North America racket sports osteoarthritis knee osteoarthritis magnetic resonance imaging MRI study Joint degeneration 
Source : Annual meeting of the Radiological Society of North America
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as an Editor-in-Chief for the Speciality Medical Dialogues section. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Before Joining Medical Dialogues, he has served at important positions in the medical industry in India including as the Hony. Secretary of the Delhi Medical Association as well as the chairman of Anti-Quackery Committee in Delhi and worked with other Medical Councils in India. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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