Knee Pain After Running: Runner's Knee or Something More?

Every year, as the Mumbai Marathon in January gets closer, I see more runners with sore knees. Typically, someone who ran comfortably at 15 to 20 km a week starts a half or full marathon plan, adds a long Sunday run, and three or four weeks later the knee begins to ache.

The knee is rarely “worn out” in these cases. Tendons and bone adapt to running more slowly than heart and lungs, and when the load rises faster than they can keep pace, they complain. Common triggers:

• Doing too much too soon — a big jump in weekly distance, or going straight back to full mileage after the monsoon break.
• Weak hip and thigh muscles. When the muscles around the hip and the front of the thigh tire, the kneecap and the outer side of the knee take more strain.
• Surface and route changes — hard roads, sloping roadsides, repeated flyover climbs and descents, or a new route with more downhill.
• Worn-out or new shoes, especially a sudden change in shoe type.
• Too little recovery — poor sleep and no easy days.

The exact spot that hurts is the most useful clue. Put one finger on it:

• Around or behind the kneecap — this is classic “runner's knee”, or patellofemoral pain. It is worse on stairs, downhill, squatting, and after sitting long with the knee bent.
• Just below the kneecap, on the tendon — patellar tendon pain, common with hills and speed work; often stiff at first and easing as you warm up.
• On the outer side of the knee — often iliotibial band (ITB) pain. It typically comes on at a predictable point in a run and can force you to stop.
• On the inner side, a little below the joint — often irritation of the tendons that attach there. If the pain is on the joint line itself, especially with clicking or catching, a meniscus problem or early arthritis is possible.
• On the shin bone just below the knee, with pain when you press one spot on the bone, or pain that is now there even when walking or at night — think of a stress fracture. This needs to be seen, not run on.

Pain that started with a twist, a pop or a fall, or that came with swelling, is a different story from slow-onset overuse pain. Twisting injuries can tear the meniscus or a ligament; see Meniscus tear: physiotherapy or surgery?

For overuse pain, complete rest is rarely necessary. What helps is reducing the load to a level the knee tolerates, then building it back up.

• Cut back, do not always stop. Reduce distance and pace, drop speed work and hills for now, and run on flat ground. A useful rule: mild discomfort during a run is acceptable if it settles by the next morning. Pain that makes you limp or is worse the next day means too much.
• Keep fit in other ways. Cycling, swimming and brisk walking keep your fitness while the knee calms down.
• Strengthen the hips and thighs. This is the treatment that makes the biggest difference for runner's knee and ITB pain. Side-lying leg raises, bridges, step-ups and slow squats to a comfortable depth, several times a week; a sports physiotherapist can tailor them.
• Build back gradually. Increase weekly distance in small steps, with an easier week every few weeks.
• Look at your shoes and stride. Replace badly worn shoes, and avoid switching to a very different type before a race. Slightly shorter, quicker steps reduce knee load for many runners.

Ice for 15 to 20 minutes, wrapped in a cloth, eases soreness; paracetamol is fine occasionally. Check with your doctor before taking anti-inflammatory tablets if you have kidney, stomach or heart problems, high blood pressure or take blood thinners.

Most runner's knee and ITB pain improves over several weeks to a few months with this approach. An MRI is usually not needed, and injections are not a first-line treatment for these problems; the reasons are in Knee injections: what works and what doesn't.

Overuse pain builds slowly and eases with rest. Please do not wait and see if any of these apply:

• The knee swelled quickly after a twist, a fall or a pop.
• The knee locks and will not straighten fully, or keeps catching.
• It gives way or feels unstable when you turn or come down stairs.
• You cannot put weight on the leg, or cannot take four steps without help.
• Pain is on the bone, with a tender spot you can press, or pain when walking or at night. A stress fracture needs rest from running and sometimes imaging.
• A child or teenager has knee pain with a limp, or pain in the hip or groin. A hip problem can show up as knee pain and should be checked without delay.
• Pain is not improving after two to three weeks of sensible changes, or keeps getting worse.

Go to the emergency department the same day if:

• The knee is hot, red and swollen with fever, especially without any injury. Joint infection has to be ruled out urgently.
• The calf is painful, swollen or tight, particularly after a long flight, recent surgery or a period of reduced movement. This can be a blood clot.
• The foot becomes cold, pale, numb or weak after an injury.

Runners with low body weight, irregular periods, a past stress fracture or a very restricted diet are more prone to stress fractures, and should have bone pain checked early rather than late.

For people with healthy knees, regular recreational running is not generally thought to cause knee arthritis, and staying active is good for joints, weight and heart.

If you already have knee arthritis, running is not automatically forbidden. Some people with mild arthritis run comfortably with lower mileage and strong thigh muscles. If the knee swells after every run, or aches for days, switch to cycling, swimming or brisk walking. My article Do I need a knee replacement yet? explains how I decide when arthritis has gone beyond these measures.

After a knee replacement, I advise patients not to return to regular running. Brisk walking, cycling, swimming, the gym and trekking at a gentle pace are all reasonable goals once you have recovered; the recovery timeline shows what is typical. Pain or swelling that appears months after a replacement should always be reported to your surgeon.

Runners looking for the best orthopaedic care in Mira Road want an honest answer about what is wrong, and a plan that keeps them running where that is safe. Surgicare Plus offers excellent, fellowship-trained care for exactly this, and patients come to us from across Mira Bhayandar, Vasai-Virar and Thane. I see every patient myself, from the first consultation to the last follow-up.

The first visit is a careful history of your training — distance, shoes, routes and what changed — and an examination of the knee, hips and how you squat and step. Often that explains the pain. I order an X-ray or MRI only when a stress fracture, meniscus or ligament injury is suspected, or when the knee is not improving as expected.

For most runners the treatment is non-surgical: a change in training load, a strengthening programme and a gradual return plan. When a knee genuinely needs an operation — a locked knee, a repairable meniscus tear or an ACL reconstruction — I do the keyhole surgery at our associated hospitals: Wockhardt Hospital, Gurukripa Hospital, Orbit Hospital and Apollo Spectra. My fellowship training in arthroscopy and sports medicine (Europe) and joint replacement (Queen Mary Hospital, Hong Kong) covers the sporting knee and the arthritic one, and advanced robotic-assisted knee replacement (MISSO system) is available at Wockhardt Hospital, Mira Road. You get an honest written estimate before any surgery.

The clinic is at Shop No. 40-41, Poonam Cluster 2, Mira Road East, open Monday to Saturday, 10 am to 8 pm, Sundays by appointment. WhatsApp your X-ray or MRI to +91 94219 91530 for a first opinion, or visit the Mira Road clinic page.