How to tell the difference between dog hip dysplasia and dog knee injuries

My wife and I originally thought our beloved litter-mate boxers to have suffered from hip dysplasia. After all, the boxer breed is known for its high energy, running, and jumping. They resemble every bit of the word rambunctious. Nonetheless, close to 7 years of ownership, my wife noticed our female having trouble standing from a sitting position. She also struggled to sit, sitting to one side and limping for 1-2 days afterward. I knew nothing …