Table 3.

Pre-operative and post-operative HSS PFA scores for both patellar thickness groups

Patellar thickness	N	Pre-operative HSS PFA		Post-operative HSS PFA		Paired difference		Paired t test
		Mean	SD	Mean	SD	Mean	SD	t	p
Group A (< 21 cm)	19	35.0	15.9	60.5	16.2	17.5	15.4	4.97	< 0.001
Group B (≥ 21 cm)	46	48.9	18.6	82.8	7.4	33.9	19.8	11.6	< 0.001