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.
Additional symptoms include: 1  An indentation at the top of your kneecap where the tendon tore. 2  Bruising. 3  Tenderness. Cramping.  Your kneecap may sag or droop because the tendon is 1  torn. Difficulty walking due to the knee buckling or giving  way.