Patient question
My knee feels like it will collapse going downstairs. Why?
Dr. Pablo GelberOrthopaedic Knee Surgeon
Quick answer
Going downstairs asks the thigh muscle to control the knee as it bends under your full weight, so weakness, kneecap pain or arthritis often show up there first as a feeling the knee will fold. True ligament instability is less common on stairs, notes Dr. Pablo Gelber, knee surgeon at Aman Hospital in Doha.
Why down is harder than up
Climbing stairs pushes the body up with a straightening knee. Coming down, the quadriceps has to lengthen while it works, lowering your whole body weight in a controlled way. This braking action is the most demanding thing everyday life asks of the thigh muscle.
If that muscle is weak, or if pain switches it off for a split second, the knee bends further than you intend and feels as if it is about to collapse. The forces behind the kneecap are also high on the way down, which is why kneecap problems often feel worse descending.
Likely causes
- Quadriceps weakness after an injury, surgery, illness or a long period of inactivity
- Pain behind the kneecap (patellofemoral pain or softened cartilage), common in young adults and runners
- Knee osteoarthritis, often with stiffness after sitting and aching at the end of the day
- A meniscus tear catching as the knee bends under load
- Less often, an ACL or other ligament injury, which usually also causes problems when turning
What helps now
Use the handrail, take stairs one step at a time leading down with the stronger leg, and avoid carrying heavy loads down stairs for now. In buildings and malls in Doha, the lift or a gentle ramp is a reasonable choice while you rebuild strength.
Simple exercises often help within weeks: straight-leg raises, slow sit-to-stand from a chair, and step-downs from a low step, lowering yourself over three seconds. Keep them comfortable. A short course of physiotherapy can guide the progression.
When to see a knee surgeon
Book an assessment if the feeling persists after a few weeks of exercise, if the knee swells, catches or locks, or if you have actually fallen. Seek prompt care if the knee suddenly cannot bear weight.
At Aman Hospital in Doha, Dr. Gelber checks muscle strength, the kneecap, the meniscus and the ligaments, and arranges an X-ray or MRI only if the examination suggests a structural problem.
Frequently asked questions
Why is my knee fine on flat ground but not on stairs?
Flat walking needs little bending and modest muscle effort. Stairs need deeper bending under load, which reveals weakness and kneecap pain that walking hides.
Should I avoid stairs completely?
No. Avoiding them completely tends to weaken the muscle further. Use a rail, go slowly and build strength so that stairs become easier over time.
Could this be arthritis even though I am only in my forties?
It can be, especially after an old injury or meniscus surgery, but kneecap pain and weakness are also common at that age. An examination and, if needed, a standing X-ray tell them apart.
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