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Table 1 Study group characteristics

From: Patient-specific instrumentation improved three-dimensional accuracy in total knee arthroplasty: a comparative radiographic analysis of 1257 total knee arthroplasties

 CVI group (n = 442)PSI group (n = 815)p value
Age (years)69.2 (9.5)68.9 (8.5)0.515
Gender
 Female70.4% (311)62.2% (507)0.004
 Male29.6% (131)37.8% (308)
Surgical side
 Left47.3% (209)47.7% (389)0.906
 Right52.7% (233)52.3% (426)
Kellgren–Lawrence classification
 2°36% (159)18.2% (149)< 0.001
 3°53.8% (238)44.5% (363)
 4°10.2% (45)37.3% (304)
Preoperative HKA176.7° (7.8)176.6° (9.0)0.905
Preoperative limb alignment
 Varus71.0% (314)70.6% (575)0.784
 Valgus26.5% (117)27.5% (224)
 Neutral2.5% (11)2.0% (16)
  1. Values are given as mean and standard deviation in parentheses or proportion and number of cases in parentheses, wherever appropriate
  2. CVI conventional instrumentation, HKA hip-knee-ankle angle, PSI patient-specific instrumentation