Table 2: Comparison of the results between groups.

Group 1
(nonconstrained APC)
Group 2
(constrained APC)

Survival rate at 5–10 years69%–62%80%–53%
Failures16 cases9 cases
Cause of revision ( )Deep infection (8)
APC fracture (3)
Instability (2)
Nonunion (1)
Aseptic loosening (1)
Local recurrence (1)
Aseptic loosening (3)
APC fracture (3)
Deep infection (3)
Instability8 casesNo cases