FIGURE 42.9 Approach to the patient with a subacute knee injury AP, anteroposterior Often, a patient may come to the ED with a history of trauma and knee pain that has been present for more than or days (see Fig 42.9 ) In addition to the standard AP, lateral, and patellar views, a tunnel or intercondylar view should be taken to exclude fracture, tumor, and OCD If the initial knee and hip examinations not suggest a diagnosis and no signs of infection exist, the diagnostic maneuvers in Table 42.2 should be completed The patient may have a subacute collateral ligament, cruciate ligament, or meniscal injury and require an orthopedic referral Suggested Readings and Key References