The one thing your employer or landlord is hoping you never find out is that you do not need to prove a perfect knee - only that the Appleton fall caused a measurable worsening of your preexisting condition.

That means before-and-after proof. The myth is that an old MRI, arthritis, or prior surgery kills the claim. In Wisconsin, an aggravation of a preexisting injury can still be compensable if the new fall made it worse.

Exceptions and edge cases that make it more complicated:

• You need baseline records. Prior orthopedics notes, imaging, physical therapy records, and work restrictions help show what your knee looked like before the fall. If you could climb stairs, work full shifts, or walk I-41 job sites before, and now cannot, that contrast matters.

• You need prompt post-fall treatment. Emergency room notes, urgent care records, and follow-up with an orthopedic specialist in the Fox Valley area should document new swelling, instability, locking, reduced range of motion, or a need for injections or surgery. Gaps in treatment give insurers room to say nothing changed.

• Your doctor must use causation language. The strongest record says the fall aggravated, accelerated, or precipitated the knee condition - not just that you have degeneration.

• Scene evidence still matters. Photos, incident reports, witness names, surveillance footage, and maintenance records can prove why you fell. If it happened at work or on property open to the public, Wisconsin's safe place statute may impose a higher duty to keep the premises free of hazards.

• Functional loss is evidence too. Missed work, lighter-duty assignments, new braces, cane use, and inability to do dairy, warehouse, or line work are concrete proof of worsening.

• Deadlines can quietly cost you money. A general Wisconsin injury lawsuit usually has a 3-year filing deadline, and year-end adjuster pressure to "settle before renewal" is often about closing the file cheaply, not fairness.

• If the defense says "it was already bad," compare old imaging to new imaging, and compare old symptoms to new ones. Pain alone is weaker than documented new limitations, new tears, new effusion, or new surgical recommendations.