This interventional study aims to compare the effectiveness of local multimodal drug periarticular injection in TKA patients with the standard pain control regime that includes opioids, NSAIDs, and other analgesics. The main questions The investigators strive to answer are: Is there a significant difference in the severity of pain and functional outcomes when applying periarticular injections? Are there any increased complications when applying the periarticular injections?
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perception of pain - first assessment
Timeframe: measured 12 hours after surgery.
perception of pain - second assessment
Timeframe: measured 24 hours after surgery.
perception of pain - third assessment
Timeframe: measured 48 hours after surgery.
functional status - first assessment
Timeframe: first measurement four weeks after surgery.
magnitude of disabling pain according to KSS - first assessment
Timeframe: first measurement four weeks after surgery.
magnitude of disabling pain according to KSS - second assessment
Timeframe: first measurement six months after surgery.
functional status - second assessment
Timeframe: second measurement six months after surgery.
estimated total blood loss
Timeframe: measured once 48 hours after surgery.