Effect of femoral head size and surgical approach on risk of revision for dislocation after total hip arthroplasty

Figures & data

Figure 1. Crude cumulative hazard of revision due to dislocation, according to head diameter, in non-MoM THA in patients with osteoarthritis in the Netherlands in the period 2007–2015 (n = 166,231).

Figure 2. Crude cumulative hazard of revision due to dislocation, according to surgical approach, in non-MoM THA in patients with osteoarthritis in the Netherlands in the period 2007–2015 (n = 166,231).

Table 3. Crude cumulative 6-year revision rates for dislocation, for any reason except dislocation, and for all causes, for patients who received a non MoM THA for osteoarthritis in 2007-2015 in the Netherlands, according to femoral head size group (n = 166,231)

	Straight lateral	Posterolateral	Anterolateral	Anterior	Total
	(n = 35,830)	(n = 100,823)	(n = 12,744)	(n = 14,446)	(n = 166,231)
Femoral head size	6-year RR (95% CI)	6-year RR (95% CI)	6-year RR (95% CI)	6-year RR (95% CI)	6-year RR (95% CI)
22–28 mm
Dislocation	0.74 (0.60–0.92)	1.37 (1.23–1.51)	0.75 (0.55–1.02)	0.99 (0.62–1.57)	1.11 (1.02–1.21)
Any cause except dislocation	1.97 (1.37–1.72)	1.66 (1.51–1.82)	2.47 (2.05–2.97)	3.26 (2.52–4.23)	1.93 (1.80–2.10)
All causes	2.73(2.43–3.06)	3.05 (2.85–3.27)	3.32 (2.84–3.88)	4.25 (3.39–5.32)	3.07 (2.91–3.23)
32 mm
Dislocation	0.46 (0.34–0.61)	0.89 (0.79–1.00)	0.35 (0.21–0.58)	0.31 (0.18–0.55)	0.72 (0.65–0.80)
Any cause except dislocation	2.06 (1.47–1.80)	1.91 (1.75–2.09)	2.42 (1.96–2.98)	1.74 (1.10–2.74)	1.99 (1.86–2.13)
All causes	2.53 (2.23–2.86)	2.82 (2.63–3.03)	2.81 (2.32–3.40)	2.05 (1.38–3.05)	2.72 (2.57–2.88)
36 mm
Dislocation	0.36 (0.23–0.57)	0.68 (0.53–0.88)	0.15 (0.04–0.62)	0.32 (0.16–0.63)	0.52 (0.43–0.65)
Any cause except dislocation	2.63 (2.76–2.14)	2.51 (2.19–2.88)	3.31 (2.34–4.67)	3.15 (2.36–4.21)	2.67 (2.42–3.00)
All causes	3.05 (2.53–3.67)	3.22 (2.86–3.63)	3.46 (2.48–4.84)	3.47 (2.65–4.54)	3.22 (3.00–3.52)
All sizes
Dislocation	0.57 (0.49–0.67)	1.05 (0.98–1.13)	0.51 (0.39–0.66)	0.59 (0.40–0.86)	0.85 (0.80–0.91)
Any cause except dislocation	2.18 (2.00–2.37)	1.96 (1.86–2.08)	2.64 (2.33–3.00)	2.91 (2.44–3.46)	2.13 (2.05–2.22)
All causes	2.75 (2.55–2.97)	3.01 (2.89–3.15)	3.15 (2.81–3.53)	3.50 (2.98–4.09)	3.01 (2.91–3.12)

RR: revision rate; 95% CI: 95% confidence interval.

Figure 3. Crude cumulative hazard of revision for any reason except dislocation, according to head diameter, in non-MoM THA patients with osteoarthritis in the Netherlands in the period 2007–2015 (n = 166,231).

Figure 4. Crude cumulative hazard of revision for any reason other than dislocation, according to surgical approach, in non-MoM THA patients with osteoarthritis in the Netherlands in the period 2007–2015 (n = 166,231).

Figure 5. Crude cumulative hazard of revision due to dislocation or for any reason except dislocation, according to femoral head size of non-MoM THA implanted with the direct anterior approach, in patients with osteoarthritis in the Netherlands in the period 2007–2015 (n = 14,446).

Figure 6. Crude cumulative hazard of revision due to dislocation or for any other reason, according to femoral head size of non-MoM THA implanted with the posterolateral approach, in patients with osteoarthritis in the Netherlands in the period 2007–2015 (n = 100,823).