Sometimes my knees feel weak.

About 5 to 6 years ago, while crouching and working, I felt something snap in my knee when I stood up. At that time, I had difficulty walking for two to three hours due to swelling and stiffness. I thought I should go to the hospital if the pain persisted until the next day, but since there was no significant pain, I didn't go. Since last year, I've been experiencing a lack of strength in my knee and frequent dull, aching pains.

Should I undergo a detailed examination?

Should I go to a knee specialist hospital?