A talar dome lesion is an area of damaged cartilage on the talus, the dome-shaped bone at the top of the ankle joint. It most often develops after a sprain or other ankle injury that doesn't heal quite right, and it can leave the cartilage soft, cracked, or broken loose inside the joint. Because the pain is diffuse and hard to pinpoint, talar dome lesions are frequently missed on a first exam — so persistent deep ankle pain after an injury is worth a closer look.
Roughly one in five sports injuries is a sprained ankle, and most heal without lasting problems. But when a sprain is severe, repeated, or not treated properly, the cartilage that lines the ankle joint can take the brunt of the impact. Below, our podiatrists explain what a talar dome lesion is, why it happens, and how it's diagnosed and treated.
What is a talar dome lesion?
The talus sits at the top of the ankle, directly beneath the shin bone, and its rounded upper surface — the "dome" — is covered in smooth cartilage that lets the ankle glide through its normal range of motion. That cartilage also cushions the joint with every step.
When the talar dome is injured, usually from the twisting or compressive forces of a sprain, the cartilage can soften, crack, or separate from the underlying bone. Left untreated, small fragments of cartilage — sometimes with a sliver of bone attached — can break off and float inside the joint, causing catching, locking, or ongoing pain.
What causes a talar dome lesion?
Most talar dome lesions trace back to an ankle injury that placed abnormal stress on the joint surface. Common causes include:
- A significant ankle sprain or twisting injury
- Repeated ankle sprains that never fully stabilized
- An ankle fracture that also damaged the joint cartilage
- High-impact trauma, such as a fall or car accident
- Poor footwear or foot biomechanics that place uneven load on the ankle joint
Not every case can be traced to a single injury — in some patients, the cartilage weakens gradually from cumulative wear, especially if the ankle has a history of instability.
What are the symptoms?
Because the damaged area sits deep inside the joint, the symptoms of a talar dome lesion can be vague and easy to dismiss as "a sprain that's taking a while to heal." Watch for:
- Deep, aching ankle pain that doesn't fully resolve with rest
- Pain that worsens with weight-bearing activity
- A sense of the ankle giving way or feeling unstable
- Clicking, catching, or locking sensations in the joint
- Swelling that flares after activity
How is a talar dome lesion diagnosed?
Talar dome lesions can be tricky to diagnose because the pain is hard to localize to one specific spot, and plain X-rays don't always show cartilage damage clearly. Your podiatrist will ask about any prior ankle injuries and examine the joint for clicking, swelling, or limited range of motion. From there, additional testing may include:
- X-rays to check for associated bone injury
- MRI to visualize the cartilage and identify the size and location of the lesion
- A diagnostic anesthetic injection to confirm the source of the pain
How is a talar dome lesion treated?
Treatment depends on the size of the lesion, how long symptoms have been present, and how the ankle responds to conservative care.
Nonsurgical treatment
- Immobilization in a cast or boot to let the cartilage settle and heal
- Anti-inflammatory medications to reduce pain and swelling
- Bracing to support the joint during daily activity
- Physical therapy, including taping, temperature therapy, targeted exercises, orthotics, and soft-tissue work to restore strength and stability
Surgery
When conservative treatment doesn't relieve symptoms — or when loose fragments of cartilage or bone are causing mechanical catching or locking — surgery may be recommended to remove the damaged fragments and, in some cases, stimulate new cartilage growth in the affected area.
What happens if it's left untreated?
An untreated talar dome lesion can progress to arthritis in the ankle joint as the surrounding cartilage continues to wear down. Arthritis that develops this way may require ongoing bracing, physical therapy, medication, or additional surgery down the road — which is one more reason to have persistent post-sprain ankle pain evaluated rather than waiting it out.
If your ankle pain hasn't fully settled weeks after a sprain, or if you notice clicking, locking, or instability, it's worth having it examined. You can request an appointment at either of our Northern Utah offices.
Medically reviewed by the physicians at Wasatch Foot & Ankle Institute. Our board-certified, fellowship-trained podiatrists provide foot and ankle care in Farmington and South Ogden, Utah. This article is for general education and is not a substitute for an in-person evaluation.