There are a number of potential causes of Hornerâs syndrome, each affecting a different place in the sympathetic chain: 1  First order neuron lesion: brainstem stroke. 2  Second order neuron lesion: apical lung tumor, neck trauma, other. 3  Third order neuron lesion: orbital trauma or inflammation, carotid dissection, other.
In very severe cases where the patella keeps dislocating, the attachment of the patellar tendon may also have to be moved. Once the surgery heals, the patella will track up and down in the patellar groove, reducing pressure on the articular cartilage. 1  Knee Pain: Symptoms, Causes, and Treatments.
1 You can't bear weight on the knee. 2  Your knee looks misshapen or abnormal. 3  Your knee locks, buckles, or makes a clicking sound when you bend it. 4  You have severe pain in the knee even when resting.5  You have noticeable swelling or redness around the knee, or the knee feels warm to the touch. You can't bear weight on the knee. 2  Your knee looks misshapen or abnormal. 3  Your knee locks, buckles, or makes a clicking sound when you bend it. 4  You have severe pain in the knee even when resting.