Hurt Your Knee? Here Is How We Evaluate It

TL;DR: A knee injury does not need an emergency room to get taken seriously. Fishtown Medicine evaluates knees the same or next day: your story first, then a hands-on exam that checks the ligaments and meniscus, then imaging only when it would change the plan. A bruise that still causes a limp after 2 weeks, swelling that came back, or a knee that gives way, catches, or locks deserves that exam. A knee that looks deformed, cannot hold any weight, or is hot and swollen with a fever belongs in emergency care today.

Knees get hurt in ordinary ways: a fall on the sidewalk, a twist on the soccer field, a collision with a coffee table, a bad landing off a curb. Then comes the uncertainty, because the knee half-works. You can walk, but there is a limp. It is better than last week, but not right. The question in your head is usually specific: did I just bruise it, or did I damage a ligament?

That question has a good answer, and getting it does not require guessing, waiting months for an orthopedic slot, or an expensive scan as the first step. It requires a careful history and an examined knee. That is the kind of visit this practice is built for.

Can Fishtown Medicine evaluate my knee injury?

Yes. Knee injuries, sprains, strains, and contusions are part of the acute care we handle, and the evaluation usually happens the same or next day. Here is how it works:

1. Start with a message. Tell Dr. Ash what happened, when, and how the knee behaves now: weight-bearing, swelling, stairs, any giving-way or locking. Photos and videos help, and a short video call often sorts out how urgent things are within minutes.
2. The hands-on exam. A knee exam needs hands, so Dr. Ash comes to you: home visits cover all of Greater Philadelphia. The exam uses the same ligament and meniscus tests an orthopedic office uses, and for most knees it answers the ligament question with useful confidence.
3. Imaging when it changes the plan. If the exam raises concern for a fracture, an X-ray gets ordered at an imaging center near you. If a significant ligament or meniscus tear would change what we do next, an MRI gets ordered, with the insurance prior authorization handled by us. Our bone and joint imaging guide explains how those choices get made.
4. The plan, and the follow-through. Most knee injuries heal with a structured plan: protected loading, a progression back to activity, and sometimes physical therapy, which we arrange with people we trust. If the injury turns out to be surgical territory, Dr. Ash refers you to the right orthopedic surgeon with a briefing, and reads everything that comes back. You are never left to coordinate your own knee.

If you are outside Greater Philadelphia, the video triage, imaging orders, and coordination all still work; the hands-on portion gets arranged at a facility near you, the way our virtual care across Pennsylvania always works.

I bruised my knee 2 weeks ago and still limp. Is that normal?

Sometimes, and it is worth checking. A knee contusion, a deep bruise from a direct hit, usually improves steadily over 1 to 3 weeks, and a mild limp early on is common. What earns an exam is the trajectory and the company the limp keeps. A limp that has stopped improving after 2 weeks, swelling that persists or returns after activity, pain in one specific spot rather than a general ache, or any sense that the knee gives way, catches, or locks are all reasons to have the ligaments and meniscus checked rather than waiting another month on hope.

The reassuring part: most knees that can bear weight and are slowly improving turn out to have soft-tissue injuries that heal without surgery. The useful part: an exam settles the question, so you rehab the knee you have instead of the knee you fear.

How do you check for ligament damage without an MRI?

Mostly with hands and history, which surprises people. The mechanism of injury tells half the story: a pop with a pivot points one direction, a blow to the outside of the knee another, a dashboard-style impact another. The exam tells most of the rest. Specific maneuvers stress each structure one at a time: the Lachman test for the ACL, varus and valgus stress for the collateral ligaments, posterior drawer for the PCL, and McMurray-type rotation tests for the meniscus. Performed carefully, these tests identify significant ligament injuries with an accuracy that rivals imaging for the decisions that matter early.

MRI still has a role, and it is a deliberate one: confirming a tear when the exam raises real suspicion, mapping an injury before a surgical conversation, or sorting a knee that is not following the expected course. What MRI is not is the first step for every sore knee, because scans of working knees light up with findings that were there before the injury and would mislead the plan.

Do I need an X-ray after a knee injury?

Only some knees do, and the decision rules here are well studied. The Ottawa knee rules, used in emergency departments for decades, recommend an X-ray after acute injury when any of these is true: age 55 or older, tenderness at the kneecap alone or at the head of the fibula (the bony knob on the outer side just below the knee), inability to bend the knee to 90 degrees, or inability to take 4 weight-bearing steps both right after the injury and at the evaluation. A knee that fails one of those checks deserves a picture of the bones. A knee that passes them very rarely has a fracture, and skipping the X-ray is safe.

This is the kind of decision the evaluation exists to make: which knees need which picture, and which need none.

When is a knee injury an emergency?

A few presentations should go to emergency care today rather than waiting for any appointment, ours included:

• The knee or leg looks deformed, or the kneecap is visibly out of place.
• You cannot bear weight at all, not even for a few steps, above all right after the injury.
• The joint is hot and swollen and you have a fever, which raises concern for infection inside the joint.
• The foot below the injury is numb, cold, or pale, which raises concern for nerve or blood vessel injury.
• Massive swelling within the first hour or two of a high-force injury.

Everything else, the limps, the twinges, the swelling that comes and goes, the "it's better but not right", is what a same or next-day evaluation is for.

What happens after the diagnosis?

The plan depends on what the exam and any imaging show, and this is where having one physician pays off. A contusion or mild sprain gets protected loading and a return-to-activity progression, with a check-in to confirm the trajectory. A moderate sprain or meniscus irritation often adds physical therapy, arranged with therapists we trust and a follow-up to make sure it is working. A complete ligament tear opens a decision conversation, because even complete ACL tears are not automatically surgical; activity level, goals, and the rest of your health all weigh in, and if surgery is the right call, Dr. Ash refers you to the right surgeon with a briefing and stays your quarterback through rehab.

Either way, the follow-up is built in. For injuries we check in at about a week, and sooner if anything changes. Healing gets tracked, not assumed.

Scientific References

1. Stiell IG, Greenberg GH, Wells GA, et al. "Prospective Validation of a Decision Rule for the Use of Radiography in Acute Knee Injuries." JAMA. 1996;275(8):611-615.
2. Benjaminse A, Gokeler A, van der Schans CP. "Clinical Diagnosis of an Anterior Cruciate Ligament Rupture: A Meta-analysis." Journal of Orthopaedic & Sports Physical Therapy. 2006;36(5):267-288.
3. Englund M, Guermazi A, Gale D, et al. "Incidental Meniscal Findings on Knee MRI in Middle-Aged and Elderly Persons." New England Journal of Medicine. 2008;359(11):1108-1115.
4. Frobell RB, Roos EM, Roos HP, Ranstam J, Lohmander LS. "A Randomized Trial of Treatment for Acute Anterior Cruciate Ligament Tears." New England Journal of Medicine. 2010;363(4):331-342.

Related at Fishtown Medicine

• Bone and Joint Imaging 101 - X-ray, ultrasound, or MRI, and how we choose
• Same-Day Sick Visits in Philadelphia - how acute care works here, injuries included
• Back Pain and Sciatica - the same exam-first thinking, applied to the spine
• Virtual Primary Care Across Pennsylvania - how evaluation and coordination work beyond Greater Philadelphia