Sadly, there is probably more than one Independent Medical Examiner who would render such an opinion, however, assuming there are still "residuals" of your work-related knee injury, I would hope that most Workers Compensation Judges would not render such a finding. Even if you are left with "permanent" residuals there are still many other avenues available to the Workers Compensation Carrier to either stop and/or reduce your entitlement to Workers Compensation Benefits such as offer of light duty employment with your pre-injury employer, a Labor Market Survey, and/or subjecting you to and Impairment Rating Evaluation after you have received 104 weeks of temporary total disability.
If you do not have an Attorney, this time, it is recommended that you immediately contact a Certified Workers Compensation Law Specialist to discuss your case in greater detail so that you can determine your rights and remedies under the Pennsylvania Workers Compensation Act. Please note that most Attorneys will not charge for an initial consultation and will accept your claim on a Contingent Fee Basis.
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It is possible to be found totally recovered after total knee replacement; however, there are strong arguments to support the position that one can never fully recover from such a surgery. It really depends on multiple factors: how well you respond to the surgery, how supportive your doctor is, who your judge is, etc. I strongly recommend that you hire an attorney to protect your rights.