There are a whole slew of very important occult knee injuries - those that have a normal or near normal x-ray – that can cause serious morbidity if you miss them, and for the catchall soft tissue injuries there are some subtleties in diagnosis and management that will make a real difference to our patients. Arun Sayal and Hossein Mehdian answer questions such as: When should we suspect a spontaneously reduced knee dislocation? Do all patients suspected of a spontaneous knee dislocation require a CT angiogram to rule out vascular injury? Which patients with a low energy mechanism are at risk for knee dislocation and vascular complications? How can you increase the accuracy of the active straight leg raise in assessing for quadriceps and patella tendon rupture? What is an easy way to identify patella baja and patella alta on a knee x-ray? What are the indications for ultrasound of the knee? What are the true indications for a knee immobilizer and how can knee immobilizers kill our patients? and many more...