Table 2.

Increase in surgical procedures over the 11-year study period for all subjects and by patient sex

	n	n-fold change	95% confidence interval	p-value
All orthopaedic surgical procedures	447 285	1.73	1.28 to 1.97	< 0.001
Patellar instability surgical procedures	3481	2.09	1.44 to 3.01	< 0.001
Rate per 1000 orthopaedic procedures		1.19	1.08 to 1.22	0.003
ED patellar dislocation reductions	5244†	2.68	1.68 to 9.50	< 0.001
Female
Patellar instability surgical procedures	2251	2.03	1.40 to 2.86	< 0.001
ED patellar dislocation reductions	2983	3.04	2.32 to 4.14	< 0.001
Male
Patellar instability surgical procedures	1230	2.22	1.53 to 4.32	< 0.001
ED patellar dislocation reductions	2258	2.29	1.51 to 4.29	< 0.001

^*three subjects did not have data on sex

ED, emergency department