Charnley low-frictional torque arthroplasty in young rheumatoid and juvenile rheumatoid arthritis: 292 hips followed for an average of 15 years

Figures & data

Table 1.  Early complications (in the first postoperative year)

Complication	No.of hips	%of hips
None	274	94
Local
Delayed wound healing	0	0
Hematoma	1	0.3
Trochanteric nonunion	9	3
Dislocation	1	0.3
Infection	0	0
General
Pulmonary embolism (not fatal)	7	2

Table 2.  Late complications (228 hips)

Complication ^a	No. of hips	% of hips
None	130	45
Dislocation	8	3
Infection	5	2
Loose cup	68	23
Loose stem	11	4
Fractured stem	6	2

^aaSome patients had more than one complication. Included: indications for revision and radiographic appearances indicating complications. Excluded: patients (hips) lost to follow-up (n = 33) and deaths (n = 88).

Table 3.  Revisions

Indication ^a	No. of hips revised	%(of 292 hips)
All	41	14.0
Dislocation	5	2
Infection	4	1.4
Loose cup	27	9.3
Loose stem	9	3.1
Fractured stem	5 ^b	1.1
Unexplained pain	1	0.3

^aIn some patients, more than one indication was pres-ent. Deep infection was recorded once.

^bOne fractured stem was not revised: the fracture was at 2 cm from the distal tip of the stem and was an inciden tal finding. It remained asymptomatic, and there was no progressive change that could be attributed to the stem fracture or loosening.

Figure 1. Cup wear measured as penetration (in mm) and the incidence of cup loosening/migration and cup revision (292 hips).

Figure 2. Survivorship analysis with revision for any reason as endpoint (292 hips).