The proximal tibiofibular joint is a less common source of pain on the outside of the knee. It’s easily overlooked because the knee joint and tendons sit so close by. So what causes fibular head pain, and what can we do about it?
Fibular head pain is one of several causes of pain on the outside of the knee.
What is the proximal tibiofibular joint?
The proximal tibiofibular joint sits between the tibia and fibula, near the outer knee. You can find it by feeling for the bony prominence on the outside of the knee — the head of the fibula — with the joint just above it. A strong capsule and ligaments surround it, and a large nerve, the common peroneal nerve, wraps around the fibular neck just below.
Sometimes the proximal tibiofibular joint connects with the knee joint. So knee problems, such as arthritis or swelling, can spill over and irritate it. Despite its tight capsule, the joint moves in and out and rotates.
Causes of fibular head pain
Several structures around the fibular head can cause pain.
Trauma
A direct knock or hit to the fibular head can damage the superior tibiofibular joint. Other mechanisms include a knee twist or landing heavily with the knee bent. Trauma can lead to a fibula fracture, cartilage damage, a ligament sprain, or popliteus tendon tears.
Proximal tibiofibular joint arthritis
Arthritis causes joint narrowing, swelling, and bony spurs. It can occur on its own or alongside knee joint arthritis.
Ganglion cyst
A ganglion is a cyst filled with thick, jelly-like fluid. These slow-growing cysts can press on nearby structures such as the common peroneal nerve, causing nerve symptoms in the lower leg.
Other causes of pain at the fibular head include biceps femoris tendonitis, popliteus tendonitis, and a lateral ligament sprain.
How do we diagnose fibular head pain?
Symptoms
Pain usually comes on after 10–15 minutes of running, and downhill running tends to be worse. There’s often little or no pain with walking, cycling, or daily activities. Most people feel the pain on the outside of the knee, though it can radiate to the iliotibial band or kneecap, sometimes accompanied by swelling or a click. Other knee problems — ITB friction syndrome, patellofemoral pain, a meniscal tear, and knee arthritis — can feel similar.
Your doctor examines the knee to confirm proximal tibiofibular joint pain and exclude other causes. Findings that point to this joint include tenderness directly over the proximal tibiofibular joint, increased joint movement, and looseness on stress testing of the outer knee. Your doctor also checks the lateral knee ligament, the common peroneal nerve, and the outer knee compartment.
Investigations
A plain X-ray can show narrowing and bony spurs in arthritis, and an abnormal joint position can suggest instability. MRI is usually more helpful, showing joint fluid, bone swelling, and cartilage damage — and it helps exclude other causes of outer knee pain.
Fibular head pain treatment
It’s essential to identify the specific cause first.
For proximal tibiofibular joint problems, we usually start with the basics: ice and oral anti-inflammatories for acute pain. Physiotherapy — soft-tissue massage and joint mobilisation — improves the function of the fibular head and surrounding structures, and exercise therapy corrects muscle imbalances and reduces abnormal forces on the joint. Balance work on a mini-trampoline or Bosu ball helps stabilise it, and foot orthotics can sometimes redistribute forces away from the joint.
Injections
If the superior tibiofibular joint is damaged, an injection can reduce pain and improve function. Cortisone is a potent anti-inflammatory for a swollen or arthritic joint, though excessive use can damage cartilage. PRP is anti-inflammatory and less harmful to the joint.
The joint is small and surrounded by a tight capsule, so we use ultrasound guidance to inject accurately — usually entering from the front to avoid the nearby nerve. One study found that ultrasound-guided injections were more accurate than blind injections.
Surgery
We reserve surgery for cases that fail non-surgical treatment. Options include ligament reconstruction and joint fixation, which can improve stability in cases of proximal tibiofibular joint instability.
Frequently asked questions about fibular head pain
What does proximal tibiofibular joint pain feel like?
Pain on the outside of the knee, typically after 10–15 minutes of running and worse downhill, often with little pain during walking or daily activities. There may be local tenderness over the fibular head, a click, or swelling. It’s easily mistaken for IT band syndrome or a lateral meniscal problem.
Can nerve damage cause fibular head pain?
Yes. The common peroneal nerve wraps around the fibular neck, so irritation or instability of the proximal tibiofibular joint can trap the nerve, causing pain, numbness, and pins and needles in the outer lower leg, and in severe cases, calf or foot weakness.
Is tendonitis a common cause of fibular head pain?
Sometimes. The popliteus tendon wraps around the outer tibia and can cause outer-knee pain that radiates behind the knee. The biceps femoris tendon attaches to the fibular head, and although biceps femoris tendonitis is uncommon, it causes pain close to the fibular head.
How is fibular head pain different from IT band syndrome?
Both cause outer-knee pain in runners. IT band syndrome is higher and more towards the bony bump on the outer knee, and is reproduced by the friction of the band. Fibular head pain is lower, localised over the joint itself, and reproduced by pressing or stressing that joint. An examination, with imaging if needed, separates them.
Why do doctors often miss fibular head pain?
Because it’s uncommon and sits right next to the knee, attention usually goes to the knee joint itself. Many people with proximal tibiofibular joint pain have been assessed for knee arthritis or a meniscal tear without the fibular head being examined, so it helps to see a doctor familiar with this specific joint.
Final word from Sport Doctor London about fibular head pain
Fibular head pain comes from several structures, including the proximal tibiofibular joint, ligament damage, and tendonitis. Damage to the superior tibiofibular joint is an under-recognised cause of outer-knee pain, usually treated with physiotherapy, taping, and injections. See a sports medicine doctor familiar with this joint for an accurate diagnosis.
To book a knee assessment with Dr Masci in London, contact the team here or call +44 (0) 203 488 0350.
I have gone to several orthopedists and they have never done an exam of the fibular head, even though I have told them of the lateral pain over the fibular head and also pain behind the knee with flexion. They don’t seem interested in the fibula, only in the knee arthritis. How can I find a doctor familiar with fibular head pain, causes and tx
Hi Carol, I’d suggest you see a PM+R doctor in US.
LM