In this thesis, we studied both implants and patient and surgeon factors as predictors of clinical outcome after total hip and knee replacement. Additionally, we studied a number of methodological... Show moreIn this thesis, we studied both implants and patient and surgeon factors as predictors of clinical outcome after total hip and knee replacement. Additionally, we studied a number of methodological aspects of orthopaedic research, such as competing risks in estimating the probability of revision surgery, minimal clinically important differences and clinically important differences in health-related quality of life after total hip and knee replacement, patient acceptable symptom states in oxford hip and knee score after total hip and knee replacement and patient preference for questionnaire mode Show less