Implant survival and radiographic outcome of total hip replacement in patients less than 20 years old

Figures & data

Figure 1. Flow of patient inclusion and data collection.

Table 1. Category of indications for revision

	Register	Current study
1	Loosening of acetabular component	Priority diagnosis	1	Infection
			2	Dislocation
2	Loosening of femoral component		3	Fracture
3	Dislocation	Other specified	4	Aseptic loosening
4	Deep infection		5	Osteolysis
5	Fracture in acetabulum		6	Wear
6	Fracture in femur		7	Pain only
7	Pain		8	2-stage revision
8	Osteolysis in acetabulum without loosening		9	Other
9	Osteolysis in femur without loosening
10	Other (in text)

Figure 2. Example of cortical atrophy of fixed stem (white arrow).

Figure 3. Survival curves.

a. Primary THR with revision as endpoint.

b. Primary THR operated during the periods 1987–1998 and 1999–2010.

c. Primary THR with cup change as endpoint.

d. Primary THR with stem change as endpoint.

e. First revision with second revision as endpoint.

Table 2. Indications for revision

	1st	2nd	3rd	4th	5th	6th	7th	Total
Infection	2		3	1	1	1		8
Dislocation	2	1		1				4
Fracture	1							1
Aseptic loosening	18	9	3	1				31
Osteolysis	3	3						6
Wear	11	2	1					14
Pain only	1							1
2-stage revision							1	1
Other	1^a	1^b			1^c			3
Total number	39	16	7	3	2	1	1	69

a Malposition of acetabular component.

b Massive ectopic bone formation.

c Loose locking ring.