Table 5.

Prediction algorithm for outcomes after PAO

Age	Joint congruence	Space	Asymptomatic	Symptomatic	Replaced
At most 25 years	Good/excellent	≤ 2 mm	78%	8%	15%
		2–5 mm	81%	15%	5%
		≥ 5 mm	78%	21%	2%
	Poor/fair	≤ 2 mm	56%	11%	33%
		2–5 mm	66%	23%	11%
		≥ 5 mm	63%	33%	5%
Over 25 years	Good/excellent	≤ 2 mm	33%	12%	55%
		2–5 mm	47%	30%	23%
		≥ 5 mm	46%	44%	9%
	Poor/fair	≤ 2 mm	14%	10%	75%
		2–5 mm	26%	33%	41%
		≥ 5 mm	29%	53%	18%

PAO = periacetabular osteotomy.