One of the commonest musculoskeletal problems in general practice is knee pain. The assessment of knee pain following trauma is covered in this chart on A4Medicine. This provides the busy with brief information on – anterior cruciate ligament injury, posterior cruciate ligament injury, medial collateral ligament injury, lateral collateral ligament injury, posterolateral complex injury, patellar or quadriceps tendon rupture, degenerative meniscal tear and traumatic patellar dislocation. Based on history and presentation the clinician can narrow down and arrive at a working diagnosis. Knee anatomy is also shown for easy reference.