Overuse injuries of the knee
Overuse knee injuries, including patellofemoral pain syndrome, iliotibial band syndrome, pes anserine bursitis, and patellar or quadriceps tendinopathy, present with activity-related pain without a traumatic event and are diagnosed clinically by pain location, then managed with activity modification, cryotherapy, NSAIDs, and targeted physical therapy.
- Topic reviewThe full article, organized the way the exam asks it.
- ABIM-format MCQsVignettes with an explanation for every wrong answer.
- Key factsThe numbers and thresholds worth memorizing, up front.
- AI tutorMedBrain answers the question you're stuck on.
What this article covers
- Overview
Overuse knee injuries are activity-related pain syndromes from repetitive loading, not a single acute traumatic event, arising from disordered patellar tracking, tendon overload, bursal irritation, or iliotibial band friction.
- Epidemiology
Common in runners, cyclists, and other endurance or repetitive-loading athletes, reflecting the cumulative-load mechanism.
- Risk factors
Sudden increase in training volume or intensity, the dominant precipitant across all overuse knee syndromes.
- Pathophysiology
Patellofemoral pain syndrome arises from disordered patellar tracking with knee movement, loading the patellofemoral cartilage asymmetrically during repetitive flexion-extension.
- Clinical features
Patellofemoral pain syndrome: poorly localized anterior knee pain and/or stiffness with prolonged sitting, climbing or descending stairs, running, or squatting, reproduced by applying pressure to the…
- Differential diagnosis
Meniscal tear: pain with locking, catching, or grinding and a positive McMurray or Thessaly test, unlike the activity-pattern pain without mechanical locking seen in overuse syndromes, though a degenerative tear can also develop insidiously.
- Diagnosis
The diagnosis of each overuse knee syndrome is clinical, established by matching the pain location and activity pattern to the syndrome, without a formal scoring system: anterior patellar pain with…
- Management
First, for every overuse syndrome, modify or reduce the inciting activity and apply cryotherapy (ice or cold-water immersion) in the acute phase; continued aggravating activity delays recovery regardless of the specific diagnosis.
- Complications
Chronic or recurrent pain from incomplete rehabilitation or premature return to full activity.
- Prognosis
Most overuse knee syndromes resolve within weeks to a few months with activity modification and targeted physical therapy, without long-term sequelae.
- Prevention
Increase training volume or intensity gradually, avoiding week-over-week increases that outpace tendon and bone adaptation; a widely used benchmark is limiting increases to no more than about 10% per week.
Read the whole article
Subscribing to Internal Medicine opens every article, the full question bank and MedBrain, on the web, iPhone and Android.
Related articles
- Osteoarthritis
Osteoarthritis is a chronic progressive joint disorder of cartilage and subchondral bone degradation with low-grade synovitis, diagnosed clinically from age, activity-related pain, and exam findings, and managed with exercise, weight loss, topical or oral NSAIDs, and joint replacement for refractory disease.
- Bursitis
Bursitis is inflammation of a synovial bursa, most often the olecranon or prepatellar bursa, and the first task is distinguishing aseptic (traumatic or crystal) bursitis from septic bursitis before treating.
- Knee trauma
Acute knee trauma spans ligament sprains, meniscal tears, extensor-mechanism injury, and fracture-dislocation, with the anterior cruciate ligament injured most often; the first priority is excluding knee dislocation with popliteal artery injury and compartment syndrome before treating the specific ligamentous or meniscal pattern.