Compared with conventional instrumentation MRI - and CT-based patient-specific instrumentation showed higher accuracy regarding the coronal limb axis ( MRI versus conventional , @ -LSB- range , @-@ -RSB- versus @ -LSB- range , @-@ -RSB- , p < @ ; CT versus conventional , @ -LSB- range , @-@ -RSB- versus @ -LSB- range , @-@ -RSB- , p = @ ) , femoral rotation ( MRI versus conventional , @ -LSB- range , @-@ -RSB- versus @ -LSB- range , @-@ -RSB- , p < @ ; CT versus conventional , @ -LSB- range , @-@ -RSB- versus @ -LSB- range , @-@ -RSB- , p < @ ) , and tibial slope ( MRI versus conventional , @ -LSB- range , @-@ -RSB- versus @ -LSB- range , @-@ -RSB- , p < @ ; CT versus conventional , @ -LSB- range , @-@ -RSB- versus @ -LSB- range , @-@ -RSB- , p < @ ) , but the differences were small .