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Table 1 Questionnaire scores for the total population as well as each patient subgroup

From: Measurement properties of the German version of the IKDC subjective knee form (IKDC-SKF)

  Examination time point Reliability Comprehensibility Relevance
Baseline 6 months Test (T1) Retest (T2)
IKDC-SKF, mean (SD)
 Total 53.5 (15.7) 71.3 (16.7) 55.7 (17.0) 56.1 (16.5) 63.3 (19.5) 63.6 (17.5)
 ACL 60.2 (13.5) 74.2 (11.5) 63.3 (14.1) 63.8 (13.2)   67.0 (20.8)
 Meniscus 52.2 (16.6) 76.7 (16.8) 55.7 (18.6) 55.0 (17.4)   65.4 (12.4)
 Cartilage 46.8 (14.4) 60.6 (19.5) 46.8 (14.5) 47.8 (14.1)   49.9 (18.0)
 Mix 54.7 (15.3) 71.5 (14.7) 56.6 (16.4) 57.2 (17.1)   72.1 (11.0)
Lysholm Score, mean (SD)
 Total 61.6 (17.9) 80.5 (16.4)     
 ACL 67.7 (15.2) 82.5 (14.2)     
 Meniscus 62.0 (18.3) 84.0 (15.6)     
 Cartilage 53.7 (16.7) 69.8 (18.6)     
 Mix 62.5 (18.0) 82.8 (14.6)     
Tegner Activity Scale, mean (SD)
 Total 3.2 (2.0) 3.8 (1.4)     
 ACL 3.6 (2.0) 3.9 (1.5)     
 Meniscus 3.0 (1.8) 4.0 (1.5)     
 Cartilage 2.9 (1.6) 3.2 (1.5)     
 Mix 3.4 (2.3) 3.8 (1.2)     
PCS-12, mean (SD)
 Total 41.8 (10.1) 45.2 (6.6)     
 ACL 44.0 (9.6) 45.0 (6.2)     
 Meniscus 40.7 (10.2) 46.6 (5.9)     
 Cartilage 40.3 (9.0) 41.9 (7.7)     
 Mix 42.5 (10.7) 46.0 (6.2)     
MCS-12, mean (SD)
 Total 51.5 (10.3) 55.1 (7.7)     
 ACL 50.3 (9.8) 56.0 (7.0)     
 Meniscus 53.0 (9.8) 55.1 (8.2)     
 Cartilage 50.4 (11.3) 54.4 (8.4)     
 Mix 51.6 (10.3) 55.0 (7.4)     
  1. IKDC-SKF = International Knee Documentation Committee Subjective Knee Form, PCS-12 = 12-item short-form health survey (SF-12) physical component summary scale, MCS-12 = 12-item short-form health survey (SF-12) mental component summary scale, SD = standard deviation, Total = all eligible study patients, ACL = anterior cruciate ligament surgery patients only, Meniscus = meniscal surgery patients only, Cartilage = articular cartilage surgery only, Mix = patients from a combination of the three surgery types (mixed surgery subgroup)