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The inclusion criteria are presented in the
Table 1. The two absolute contra indications
were rheumatoid arthritis, or involvement of
the knee ligaments.
The 40 men for whom 2 years or more follow-
up data was available, were matched with a
randomly selected group of 40 women patients
from the 137 for whom 2 year data was avai-
lable. These two populations were comparable
in terms of age, body mass index (BMI), aetio-
logy, preoperative IKS score, number of pre-
vious joint surgery, follow-up, preoperative’s
Mechanical Femoro Tibial Axis (MFTA),
severity of cartilage wear (Ahlback’s grade),
height of the patella (index of Blackburn) and
tibial slope (Table 2, 3 and 4).
The mean age at operation of the 80 patients,
was 71 years (range 25.1-89.6 years). All
patients were operated on using the same sur-
gical technique. A medial or lateral parapatel-
lar subvastus approach was used, according to
the affected compartment. Care was taken not
to overcorrect the mechanical axis. In all
cases, an all-polyethylene insert was used in
combination with resurfacing of the femoral
condyle. All implants were cemented, and
implant size was documented (Table 5 and 6).
The patients were followed prospectively, both
with standard radiographs, and clinical assess-
ment, using the International Knee Society
(IKS) scoring system [9].
14
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Unicompartimental joint involvement with
femorotibial narrowing > 50 %
Bone loss < to 5 mm
(Ahlback grade 2 and 3)
Frontal tibiofemoral joint deformity between
170° and 194°
Partial reducibility of the deformity
Intact and fully functional ACL
Flexion > 100°
Lack of flexion < 10°
Weight less than 85 kg
Absolute contraindications :
Rheumatoid arthritis
Ligament involvement:
ACL Anterior Cruciate Ligament
Table 1 : Inclusion criteria
Men
Women
p value
Average Value SD Average Value SD
N
40
40
Right Side
26
19
n.s. (p=0.10)
Age (years)
69.7
3.8
72.3
2.4 n.s. (p=0.25)
Follow up (months)
69.6
14.2
72.7
11.69 n.s. (p=0.67)
BMI
25.4
2.5
25.6
3.9 n.s. (p=0.71)
Weight
75.6
9.7
65.2
10.3
<0.0001
Height
172,4
6.3
159.5
5.5
<0.0001
Preoperative activity
Sedentary
7
13
<0.001
Walk on the level
10
11
Walk on uneven ground
9
6
Gardening
4
3
Sport
10
7
Aetiology
Medial osteo arthritis
17
14
n.s. (p=0.54)
Lateral osteo arthritis
14
16
n.s. (p=0,52)
SPONK
9
10
n.s. (p=0.79)
Table 2 : Demographic data
SD standard deviation, n.s. non significant SPONK Spontaneous osteonecrosis of the knee BMI