Table 7.

Demographics and planning details in RCTs that compared PSI and conventional TKA

Study	Exclusion criteria	Mean BMI	Total number of PSI knees (number of surgeons)	Follow up	Details of planning	Pre-op OKS
Abane et al. [23]	Extra-articular deformity, social circumstance impairing follow-up	28.8	59 (6)	3 months	Preliminary plan reviewed and approved. No details were given on planning changes. Correct size prediction 70%	NA
Yan et al. [24]	Previous knee operations, extra-articular deformity in tibia or femur, associated medical diseases affecting rehabilitation, non-compliant	NA	30 (3)	3 months	No details were given on pre-or intra-operative changes made	23.8 ± 5.6
Chen et al. [59]	Varus or valgus deformity > 11°, pre-operative fixed flexion deformity, 249/309 knees excluded	29.4	29 (1)	2 years	No changes were made either in the preliminary plan or intra-operatively	27 ± 10
Boonen et al. [60]	Non-compliant with post-operative rehabilitation protocol, or were unwilling to participate (342/522 excluded)	30.3	82 (3)	2 years	Preliminary plan checked before approval; no details of pre-or intra-operative changes	30.0 ± 9.3
Huijibregts et al. [61]	Previous osteotomy or fracture, non-correctable valgus deformity	NA	69 (2)	1 year	Plan assessed, no details of pre-operative changes. One change made intra-operatively	Median 20 (10)

^*NA not available