Usually, and usually for longer than most people would like. You can sometimes avoid it permanently, but whether you do depends on the nature of the problem within the joint, not your willpower.
Begin with load reduction. Reducing impact, deep flexion, and rotational activities decreases stress on painful surfaces; reducing your weight also lowers stress with each step. A cane in the opposite hand or an off-loading brace works through the same mechanism.
Next comes strengthening. A physical therapy program focusing on the quadriceps, hamstrings, and hip musculature provides additional stability to the joint, and frequently reduces symptoms people attributed to the structural injury.
Anti-inflammatories calm a flare, and injections can buy quieter weeks, though repeated steroid injections are hard on the joint over time.
None of these restores lost anatomy. They reduce the pain your existing injuries produce, which is a real benefit, but not a repair. The other treatments people ask about fall under regenerative medicine, in which your own blood or marrow is concentrated and put back into the joint. These are treatments, not a fast pass around a torn structure, and whether they apply is determined by the diagnosis.
So the choice is rarely surgery versus nothing; it is surgery now versus surgery later, and timing decides. A knee that settles with rest and therapy is a different situation from one that keeps swelling, locking, or buckling, and delaying past that point can lose the very tissue joint preservation exists to protect. If you do not know which knee yours is, request an appointment and find out.