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"While many competent veterinarians routinely perform a complete blood count, a serum biochemistry profile and a urinalysis on dogs displaying lameness or other obvious signs of pain, the results of these tests are typically inconclusive when patellar luxation is the culprit, because displacement of the patella is not a disease or systemic disorder.  This condition involves only the knee joint(s) and some form of anatomical malalignment of muscle, tendons, supporting soft tissue and bones.  Manual palpation of the knee will usually reveal patellar instability in affected animals.  The patella may \u201Cpop\u201D in and out of place when manipulated.  Sedation may be required during this procedure, because it can be quite painful."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Patellar-Luxation/Diagnosis.aspx>