When should I genuinely start to worry about swelling after undergoing knee surgery? Is there a specific threshold of swelling that warrants concern, or are there additional symptoms I should be vigilant for, such as increased pain, redness, or warmth in the affected area? How does the nature of the surgical procedure influence the expected swelling in the postoperative phase? Furthermore, should the duration and intensity of the swelling raise any red flags, particularly if it persists beyond what is commonly anticipated? Are there particular stages of recovery where swelling might be considered normal versus a potential sign of complications? What role does individual health status, including pre-existing medical conditions or overall physical fitness, play in determining the normalcy of post-surgical swelling? Also, should I consult a healthcare professional if the swelling suddenly worsens or is accompanied by unusual symptoms? Understanding these nuances is vital for safeguarding my recovery and overall well-being.