My knee catches when I stand up after sitting. Why?

Why sitting sets it off

When the knee stays bent for a long time, at a desk, in a car on the Doha expressways or on a long flight, the kneecap is pressed into its groove and the soft tissues around it stiffen. As you straighten to stand, the kneecap has to glide upward again. If its cartilage is irritated or it tracks slightly off-centre, it can catch briefly, with a twinge, a grinding feel or a moment where the knee hesitates before it straightens.

A plica, a normal fold of joint lining at the inner front of the knee, can thicken after overuse or a knock and snap over the bone as the knee moves through about 30 to 60 degrees of bend.

How it differs from a true lock

• With this kind of catch, the knee still straightens fully if you push through or take a couple of steps
• Pain is felt at the front, around or behind the kneecap, rather than deep on one side
• It is often worse on stairs, squats and after sitting, typical of patellofemoral pain
• True locking, by contrast, is a firm block that stops the knee straightening at all

What usually helps

• Get up and move every 30 to 45 minutes when sitting for long periods
• Straighten and bend the knee a few times before you stand
• Strengthen the thigh and hip muscles; this is the core treatment for kneecap pain
• Reduce deep squats, kneeling and heavy stair work for a while
• Check your car and desk set-up so the knee is not bent sharply for hours

Most people improve over 6 to 12 weeks with a consistent exercise programme.

When to see a knee surgeon in Doha

Book an assessment if catching continues despite a few weeks of exercises, if the knee swells, if you feel the kneecap slipping, or if the knee ever truly locks. At Aman Hospital, Dr. Gelber examines how the kneecap tracks, checks for plica tenderness and meniscus signs, and arranges imaging only when it will change the plan. Surgery for plica or kneecap catching is uncommon and considered only after a proper rehabilitation programme.