Worn meniscus

What it is

The menisci are two crescents of cartilage that spread load across the knee. With age they degenerate and can tear without any injury, which is why so many are found on scans of people with gradual-onset knee pain and no specific incident.

The evidence here is unusually strong and unusually ignored. Multiple randomised trials comparing arthroscopic partial meniscectomy with exercise therapy for degenerative tears find no meaningful difference in pain or function at two years - and degenerative tears are extremely common in pain-free knees, which means finding one does not establish it as the cause.

What it feels like

• Aching pain along the joint line, usually the inner side
• Worse with twisting, squatting, and getting in and out of a car
• Sometimes catching or a sense of the knee not being trusted
• Swelling after activity
• Onset gradual, or after something trivial like standing up from a squat

What causes it

Most people have more than one of these at once, and they feed each other. Read the list looking for the two or three that sound like your week rather than for the one true answer — the ones that describe you are the ones worth acting on.

Age-related meniscal degeneration

Meniscal tissue loses water content and becomes more brittle from middle age onward. Tears then occur under ordinary loads rather than requiring an injury.

Part of early osteoarthritis

Degenerative meniscal tears usually occur alongside cartilage and bone changes. They are a feature of the arthritic process rather than an independent problem, which is why removing them does not fix the knee.

Quadriceps weakness

Weak quadriceps mean load arrives at the joint faster and less evenly. It is one of the most consistent findings in symptomatic knees and one of the most treatable.

Hip abductor weakness

A pelvis that drops and a knee that falls inward concentrates load on the inner compartment, which is where degenerative tears predominantly occur.

Body weight

Load through the knee in walking is several times body weight. It contributes both mechanically and through inflammatory signalling.

Previous knee injury

A previous ACL or meniscal injury substantially raises the risk of degenerative change and further tears decades later.

Occupational squatting and kneeling

Years of deep knee flexion under load is associated with meniscal degeneration and with knee osteoarthritis generally.

Being told a tear is the cause

Not a biological cause but a major driver of what happens next. Degenerative tears are found in a large proportion of pain-free knees over fifty, so the finding on a scan is frequently incidental.

Who tends to get it

• Adults over forty, in whom degenerative tears become common
• Anyone with existing knee osteoarthritis
• People with a previous knee injury
• Those in occupations involving heavy squatting or kneeling
• Anyone carrying extra weight with weak quadriceps

What makes it worse, and what settles it

The qFIT routine for this

Ready-made routineKnee Pain/Bulletproofing

qFIT already has this one built. It runs massage first, then stretching, then strength — the order that works on a body that is already sore — and every activity in it carries the reason it is there.

The button below opens your Checklist with this routine already selected, so instead of your whole list you land on just its Categories, Targets and Exercises, each with its checkbox, ready to tick as you work through them.

Have more than one problem? Tick yours under My Problems on My Profile and your Checklist's Routine list gains Recommended for my problems — every routine for the problems you picked, merged into one. Your picks stay private; that filter is the only thing they feed.

Get it checked if…

True mechanical locking (cannot straighten the knee) is the one presentation that may need surgery

And whatever the body part: chest pain or unusual breathlessness on exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or one calf that is swollen, warm and painful. Any of those, stop and get assessed.

How it usually goes

Exercise therapy improves pain and function over three months and matches arthroscopic surgery at two years in the trials that have tested it directly. That makes exercise the reasonable first choice for a degenerative tear, with surgery reserved for a knee that genuinely locks - a true mechanical block that cannot be straightened, which is different from catching or giving way. Being told a scan shows a tear is not, on its own, a reason for an operation.

Prevalence basis: Imaging prevalence studies

Others the same routine covers

These share the Knee Pain/Bulletproofing routine, so the work is the same. If one of them also sounds like you, that is a reason to expect more from it, not less.

This is general information, not a diagnosis, and it cannot examine you. If it matches you, use it to ask better questions of a clinician rather than to replace one.