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

Why does going downstairs hurt your knee more than going up?

Descending stairs puts a much greater compressive load through the patellofemoral joint than climbing does. 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 kneecap load is lower. That is why you might climb a full flight with no trouble, then wince on the way back down.

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

What does stair-related knee pain feel like?

The pain typically centres on the front of the knee, around or behind the kneecap. You might also notice some of the following.

If you experience sudden locking, significant swelling, or your knee gives way with weakness or numbness in your leg, seek urgent medical attention from your GP, 111 or A&E. 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 descending 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 leg-length difference, can change the way force travels through the knee. Pain often shows up away from its real cause, which is why looking at the knee alone can miss the full picture.

How is knee alignment assessed when you are standing up?

A standing, weight-bearing scan captures how your joints align under real load, 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 contributing to the load on your knee.

What can help with knee pain descending 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 contributing to poor knee alignment, orthotics or footwear changes may be recommended.
• Activity modification. Temporarily adjusting how you use stairs, 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.

Frequently asked questions