Overview
Pes anserine pain is tenderness on the inside of the knee, usually a few centimetres below the joint line on the upper shin. It involves the shared attachment of three tendons — the sartorius, gracilis and semitendinosus — and the small bursa beneath them.
The labels bursitis, tendinopathy and pes anserine pain syndrome are often used interchangeably because the bursa and tendons are so close together. The precise tissue is less important than ruling out a more serious joint or ligament injury and finding a sensible way to settle and rebuild the area.
Typical Pattern
- One-finger tenderness below the inner knee joint, rather than directly on the joint line
- Gradual onset after more running, hills, stairs or repeated knee bending
- Discomfort with stairs, getting up from a chair, squats or longer runs
- Symptoms that are local and load-related, without a major twist or immediate swelling
Running can bring this on, but inner-knee pain is not automatically pes anserine pain. A recent twist, swelling, catching, locking or pain exactly on the joint line makes a meniscus injury or MCL sprain more important to assess.
Why It Can Flare Up
It often appears when repeated loading exceeds current capacity: a rapid increase in distance, hills, speed work, stairs or a return to running after time away. Hamstring, hip and knee strength all help share that load. Footwear, surface, recovery and overall training change can contribute, but there is rarely one single culprit.
What Usually Helps
- Temporarily reduce the run dose or terrain that reliably provokes it, rather than forcing painful mileage
- Keep comfortable movement in the week: cycling, walking or flat running may be useful alternatives depending on symptoms
- Build hip, hamstring and quadriceps strength progressively; the goal is capacity, not endless stretching
- Reintroduce hills, pace and distance one at a time once ordinary walking and stairs are settling well
Complete rest can quiet symptoms for a few days, but it does not prepare the tendons for the next increase in running. A physiotherapist can help distinguish this pattern from an MCL, meniscus or joint problem if it is not clear.
When to Get Assessed
Arrange an assessment if pain is worsening, persistent, associated with swelling or limiting normal walking. Seek prompt care after a twist with a pop, a knee that locks or will not straighten, repeated giving way, fever with a hot swollen joint, or an inability to bear weight.
Related Reading
- Inner knee pain: a location guide
- Hamstring tendons at the knee
- MCL sprain
- Meniscus tear
- Knee pain after running: location guide
References
- Mohseni M, Mabrouk A, Li D. "Pes Anserine Bursitis." StatPearls. Updated 2024. https://www.ncbi.nlm.nih.gov/books/NBK532941/
- Mahroos R, Almoallim H. "Approach to Musculoskeletal Examination." Skills in Rheumatology. 2021. https://www.ncbi.nlm.nih.gov/books/NBK585755/
This information is for education only and is not a medical diagnosis. InjuryAtlas does not replace an assessment by a qualified health professional. Seek care promptly for severe pain, major swelling, fever, loss of function, or symptoms that are worsening.