The document discusses factors that influence range of motion (ROM) after total knee arthroplasty (TKA), including patient factors like obesity, surgical technique, and prosthetic design. It finds that posterior stabilized (PS) designs can provide higher ROM than posterior cruciate retaining designs, and that the LPS High Flex PS design further increases ROM, with reported passive flexion of 130-140 degrees in many cases. However, it also notes there may be increased risks of wear, synovitis, and anterior knee pain with such high flexion.