When Is Knee Pain Serious? Six Signs to Get It Checked

Knee pain is common enough that most people ignore it for months. Some of it genuinely settles on its own. Some of it does not, and waiting makes the eventual treatment harder. This is how to tell the difference.

Pain that usually settles on its own

Aching after an unusually long walk, soreness for a day or two after gardening, or stiffness that eases within ten minutes of getting moving are all common and usually harmless. Muscles and tendons complain when they are asked to do more than usual, and they recover.

Give this kind of pain two to three weeks, relative rest from the aggravating activity, and simple measures — ice after activity, an anti-inflammatory if your stomach and kidneys tolerate it, and gentle movement rather than complete rest. If it is steadily improving week on week, it is very likely to keep improving.

Six signs the knee needs looking at

These are the patterns that suggest something structural rather than something that will settle.

Pain that wakes you at night

Mechanical pain from overuse quietens when the joint is unloaded. Pain that wakes you, or that is present at rest, points at inflammation inside the joint or at arthritis that has progressed beyond the early stage.

Swelling within hours of an injury

A knee that swells within a few hours of a twisting injury usually has blood inside it. Blood in a joint after trauma means something structural has torn — commonly the anterior cruciate ligament, sometimes the meniscus or the joint surface itself.

Locking or giving way

A knee that catches, sticks, or refuses to straighten fully has something physically obstructing it — most often a displaced fragment of meniscus. A knee that gives way without warning is unstable, and every episode risks further damage.

Shrinking walking distance

If the distance you can comfortably walk has fallen month on month, that is a functional measure of progression, and it is more useful than any single description of how bad the pain feels.

Visible change in shape

Bowing of the leg, or a knee that no longer straightens fully, indicates the joint surface has worn unevenly. Once alignment changes, load concentrates further on the worn side and the process accelerates.

Pain that has not moved in three months

Pain that is neither better nor worse after a genuine course of medication, physiotherapy and activity change is unlikely to resolve with more of the same.

When to be seen the same day

A small number of presentations should not wait: inability to bear weight after an injury, obvious deformity, a hot swollen joint with fever, numbness or coldness below the knee, or a knee that is locked and will not straighten. Fever with a hot joint in particular needs urgent assessment, because infection inside a joint damages cartilage quickly.

What an assessment actually involves

A consultation is not a commitment to surgery. It is a history, an examination, and usually a weight-bearing X-ray — taken standing, because a film taken lying down understates joint space loss. The point is to establish what is causing the pain, which determines everything that follows.

It is worth knowing that a large proportion of knee consultations end without any surgical plan. Weight management, targeted strengthening, an injection or a change in activity resolves a great deal of knee pain. Surgery enters the conversation when those have genuinely been tried, or when the joint surface is worn away and there is nothing left for them to protect.

The cost of waiting too long

Delay is reasonable while non-surgical treatment is still working. Beyond that, prolonged delay allows muscle wasting and deformity to progress, and both make recovery from eventual surgery slower and less complete. A knee replaced from a position of reasonable strength and alignment does better than one replaced after years of limping.

If several of the signs above describe your knee, an assessment is worth arranging. Call the clinic on +91 6355 991 466, or read more about knee treatment options.

Trusted sources and further reading

This article is general information reviewed by Dr Dev Padia. For more on the conditions and treatments mentioned, see the pages below.

• Knee replacement — when a worn knee needs resurfacing.
• Sports injury surgery — for ligament and cartilage injuries.
• OrthoInfo: Arthritis of the Knee — American Academy of Orthopaedic Surgeons.
• NHS: Knee pain — UK National Health Service.

The information on this website is for general guidance and does not replace a personal medical consultation. Please consult a qualified doctor about your own symptoms.