Knee Injury at Work: The Meniscus Tear Nobody Wants to Wait On

A knee injury at work is often a meniscus tear from a twist, a hard kneel or a fall on a slick floor. Most of these tears are treated first with an exam, imaging, a modified-duty plan and guided rehab. Platelet-rich plasma (PRP) is one option when the knee keeps swelling or hurting despite that care.

The fastest answer is not always the best one. A torn meniscus on an MRI tends to lead straight to a scope, because a scope feels like doing something. But in the best-known trials of middle-aged knees, trimming the torn piece did no better than a sham operation or a good exercise program. Removing meniscus also takes away the knee’s shock absorber. That is a trade you live with for decades.

How does a meniscus tear happen at work?

Each knee has two meniscus pads. They are rubbery wedges of cartilage that spread load across the joint. They tear when the knee bends and twists under weight at the same time.

On the job that looks like a few common moments:

• Pivoting with a box while your foot stays planted.
• Kneeling for hours on concrete, then standing up with a twist.
• Stepping off a truck, dock or ladder and landing off balance.
• Slipping on a wet or icy floor and catching yourself.

The signs are swelling over the next day, pain along the inside or outside of the joint line, and catching or locking. Some people feel the knee “give” on stairs. A knee that locks and will not straighten needs to be seen quickly.

Was the knee already worn before the work injury?

By middle age, many knees show some meniscus wear on MRI even without pain. That is why an employer’s doctor may call your tear “degenerative.” The label describes the tissue. It does not tell you whether work turned a quiet knee into a painful one.

The record that answers that question is simple. What could you do before the injury? When did the swelling start? What does the exam show next to the image? A knee that handled full shifts for years and then failed after one event has changed, and that change is what the claim is about. If you work in Illinois, your choice of doctor is protected by statute, as our Illinois injury care page explains.

What treatment comes first for a meniscus tear?

Most work knee injuries start with standard care:

• An exam, and an ultrasound or MRI when the story calls for it.
• A modified-duty plan, so you keep earning without twisting the knee all day.
• Rehab that rebuilds the thigh and hip muscles that protect the joint.
• Draining a tense, swollen knee when that helps you move.

In a Norwegian trial, 12 weeks of supervised exercise matched a scope for middle-aged patients at two years, and the exercise group had stronger thighs. A Finnish trial compared real scope surgery with a sham procedure and found no meaningful difference at one year.

There are knees that do need a surgeon. A tear that locks the knee, a large flap, a tear in a young worker that can be sewn back, or a torn ligament with it. We check for those first and refer early when we find them.

Where does PRP fit for a torn meniscus?

PRP is made from your own blood. The platelets are concentrated and placed back into the knee. They release growth signals that calm the joint and support repair. For a meniscus that keeps flaring after rehab, it is one option, alongside the standard care above.

A 2024 review of ten studies and 686 patients found that PRP for degenerative meniscus tears improved pain and function by about three months, with gains that lasted at least a year. Some studies injected the joint. Others placed PRP into the meniscus itself. The groups that targeted the meniscus had fewer patients go on to surgery.

We place PRP under ultrasound. The result depends on the platelet dose delivered and the rehab after it. You stay awake with local anesthetic, and most people drive home. The knee is often sore for about 48 hours. How many injections you need follows how the knee responds.

Why protect the meniscus now?

A meniscus injury raises the odds of knee arthritis about six times compared with an uninjured knee, according to a review of 53 studies. That risk is the real cost of a work knee injury. It is also why we try to keep the meniscus you have rather than trim it. Our page on arthritis after an injury covers what happens if the joint starts to wear.

How does this work in a workers’ comp claim?

In an accepted claim, the insurer pays for authorized care. An authorization means the payer agrees a service is medically needed. It is not a promise of payment, so we tell you which is which before scheduling. PRP is often outside what a comp carrier will authorize. That is a coverage choice, not proof it does not work. If an insurer sends you to its own doctor, read what an IME really is first. And if PRP becomes part of your plan, documenting orthobiologic care lists what the chart must show.

Related reading: PRP for a knee injured in a crash, what a functional capacity evaluation measures and repetitive strain injuries from work.

All orthobiologic care: Our orthobiologics and PRP injections page lists every injury we treat with PRP, bone marrow concentrate and microfragmented fat.

Frequently asked questions

Can a torn meniscus heal on its own?

The outer edge of the meniscus has a blood supply and can heal. The inner part has very little. Many people still do well without surgery because rehab makes the knee strong enough that the tear stops causing trouble.

Do I need surgery for a meniscus tear from work?

Not usually as a first step. A knee that locks, a tear that can be repaired in a young worker, or a torn ligament may need a surgeon. Most other tears start with rehab and modified duty.

Can I keep working with a meniscus tear?

Often yes, with limits. Less kneeling, no twisting under load and fewer ladders usually let the knee settle while you keep earning. We write those limits clearly for your employer.

Will workers’ comp pay for PRP?

Some carriers authorize it and many do not. An authorization is not a promise of payment. HSA and FSA funds can generally be used for PRP. We go over the options before anything is scheduled.

How soon should a work knee injury be seen?

Report it to your employer the same day and get seen within days. Early records of swelling and the exam carry a lot of weight later.

Where is Injury Experts located?

Accident and Injury Experts is at 4477 Woodson Rd, Suite 202, St. Louis, MO 63134, next to Lambert International Airport, with parking at the door. Call (314) 887-5866. Directions and hours are on our contact page.

Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP. Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed October 3, 2026.