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. 2015 Aug 31;9:379–389. doi: 10.2174/1874325001509010379

Table 1.

Demographic data and implant characteristics in the initial study cohort stratified per surgery type (i.e. primary TKA or revision TKA).

Primary Group Revision Group p-Value
N° of knees 19 26
Gender (n, %)
 Male  5 (26%)  3 (12%)
 Female 14 (74%) 23 (88%)
Side (n, %)
 Left  6 (32%)  9 (35%)
 Right 13 (68%) 17 (65%)
Age at surgery [yrs]
mean ± SD/(range)(
( median/(IQR)(
(distribution

69 ± 10/(43 - 82)
70/(60 - 77)
N

72 ± 7/(56 - 85)
73/(67 -77)
N

p=0.184 (a)
Indication for CCK implant -ligament loosening
-severe varus/valgus deformity
-severe osteoarthritis
-ligament loosening
-severe varus/valgus deformity
-severe bone loss/bad bone quality
Pre-op Diagnosis
(n, %)
Primary OA (11; 58%)
Post-osteotomy OA (3; 16%)
Post-traumatic OA (2; 11%)
Osteonecrosis (1; 5%)
Rheumatoid Arthritis (2; 11%)
Aseptic TKA loosening (14; 54%)
Aseptic UKA loosening (7; 27%)
Infected TKA (5; 19%)
Stem extensions
 N° of knees with femoral stem (n, %) 7 (37%) 18 (69%)
 Femoral stem diameter [mm]
median/ most used/(range)

15 /15/(13 - 20)

14/14/(11 - 18)
 Femoral stem length [mm]
median/ most used/(range)

75/75/(30 - 75)

75/75/(30 - 155)
 N° of knee with tibial stem (n, %) 19 (100%) 26 (100%)
 Tibial stem diameter [mm]
 median/most used/(range)

12/12/(11 - 16)

12.5/12 and 14/(10 - 15)
 Tibial stem length [mm]
 median/most used/(range)

75/75/(30 - 100)

75/75/(75 - 155)
Hospital stay [days]
mean ± SD/(range)
median/(IQR)
distribution

14 ± 6/(9 - 31)
13/(10 - 18)
N

16 ± 8/(9 - 39)
15/(11 – 18)
N

p=0.467 (b)
Implantation time [yrs]
mean ± SD/(range)
median/(IQR)
distribution

10.6 ± 2.2/(2.4 - 12.5)
10.8/(10.5 - 11.6)
N

11.3 ± 1.1/(7.6 - 12.8)
11.3/(10.9 – 11.9)
N

p=0.135 (b)
  • Notes

  • Ν indicates that the values are not normally distributed, according to the Shapiro-Wilk test, while N indicates the opposite.

  • (a) indicates that the Student’s t-test was used, while (b) indicates that the Mann-Whitney U test was used.

  • (*) indicates significance at p <0.05.