Study	Reason for exclusion
Albrektsson 1992	Personal communication (Albrektsson 1992) ‐ The author included post‐traumatic osteoarthritis participants
Baker 2007	Personal communication (Khaw 2002) ‐ The author did not differentiate between post‐traumatic and non post‐traumatic osteoarthritis
Beaupré 2007	Personal communication (Beaupré 2007) ‐ The author did not differentiate between post‐traumatic and non post‐traumatic osteoarthritis
Ishii 2005a	Personal communication (Ishii 2005a) ‐ Non‐randomized controlled trial
Keblish 1993	Personal communication (Keblish 1993) ‐ Non‐randomized controlled trial
Khaw 2002	Personal communication (Khaw 2002) ‐ The author did not differentiate between post‐traumatic and non post‐traumatic osteoarthritis
Nilsson 2006	Personal communication (Nilsson 2006) ‐ The author included post‐traumatic osteoarthritis participants
Önsten 1998	The study by Önsten 1998 is the same as the study by Carlsson 2005 with a shorter follow‐up