Why Do My Knees Hurt Going Down Stairs but Not Up?

Why does going down stairs hurt your knee more than going up?

Going down stairs puts a much greater compressive load through the patellofemoral joint than going up. When you step down, your quadriceps (the large thigh muscles) have to work eccentrically, meaning they lengthen while braking your body weight. During that braking phase, the force across the kneecap can reach several times your body weight.

Going up is different. Your muscles shorten to push you upward, and the load on the kneecap is lower. That is why you might climb a full flight of stairs with no trouble, then wince on the way back down.

The same idea applies to walking downhill. A gentle slope might feel fine. A steep slope forces the same eccentric braking pattern, and many people notice their knee hurts going downhill for exactly this reason.

What does knee pain on stairs feel like?

The pain is usually in the front of the knee, around or behind the kneecap. You might also notice some of the following.

If you have sudden locking, significant swelling, or your knee gives way with weakness or numbness in your leg, get urgent medical help from your doctor or the nearest emergency department. These could be signs of a more serious problem that needs prompt assessment.

What causes pain in the front of the knee on stairs?

Several conditions make the kneecap area vulnerable to the high loads of going down stairs. Often, more than one factor is at work at the same time.

Your body is a connected chain from your feet to your spine. A problem at one level, such as a flat foot, a rotated hip or a difference in leg length, can change the way force travels through the knee. Pain often shows up away from its real cause. That is why looking at the knee alone can miss the full picture.

How is knee alignment checked while you are standing?

A standing, weight-bearing scan shows how your joints line up under real load. These are the same conditions that cause your pain on stairs. Lying-down scans relax the muscles and can hide alignment problems that only appear when gravity is doing its job.

ScanAlign standing EOS imaging takes a single, low-dose image from your ankles to your hips (or your full body) while you stand naturally. The EOS system uses about 90% less radiation than a standard X-ray, around ten times less. Because it captures both legs in one image, your clinician can see whether the kneecap sits centrally in its groove, whether one leg is longer, and whether your hip or ankle alignment is adding to the load on your knee.

What can help with knee pain going down stairs?

ScanAlign is a diagnostic imaging clinic, not a treatment provider. The scan and report give you and your clinician the information needed to plan the right next step. Common approaches that clinicians consider include the following.

• Targeted strengthening. Physiotherapy focused on the quadriceps, hip abductors and gluteal muscles can improve how the kneecap tracks under load.
• Gait and footwear review. If foot position is adding to poor knee alignment, orthotics or changes to footwear may be recommended.
• Activity modification. Changing how you use stairs for a while, for example taking them one step at a time or leading with the stronger leg going down, can reduce pain while rehabilitation takes effect.
• Clinical review. If imaging shows significant cartilage wear or structural misalignment, your clinician may discuss further options with you.

The important point is that the right approach depends on understanding the cause. A scan that captures your alignment standing up gives clinicians a much clearer starting point.

So before you start treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.

Frequently asked questions