. 2016 Jun 8;474(10):2168–2180. doi: 10.1007/s11999-016-4918-9

Table 5.

Patterns of osteoarthritis preoperatively and at most recent followup for the two study groups

Pattern of osteoarthritis	Protrusio		Control group		p value*	p value^†	p value^‡	p value^§
Pattern of osteoarthritis	Preoperative	Followup	Preoperative	Followup	p value*	p value^†	p value^‡	p value^§
Joint space narrowing (percent positive)
Lateral	6	45	10	22	0.37	< 0.001	0.03	0.019
Medial	33	35	5	11	< 0.001	0.671	0.143	0.004
Concentric	0	0	2	3	0.486	1	0.644	0.496
Posteroinferior	18	19	2	13	0.008	0.555	0.008	0.885
Osteophyte formation (percent positive)
Femoral
Lateral	26	39	6	17	0.004	0.215	0.035	0.015
Anterior	15	23	1	8	0.008	0.309	0.042	0.051
Foveal	12	23	2	11	0.062	0.203	0.032	0.13
Posteroinferior	21	32	4	13	0.007	0.216	0.042	0.02
Acetabular
Lateral acetabular edge	15	52	5	25	0.085	0.002	< 0.001	0.009
Saber tooth [20]	6	29	6	19	0.659	0.014	0.012	0.284

All values are expressed as percentages; * preoperative between the two study groups; †preoperative versus followup status in the protrusio group; ^‡preoperative versus followup status in the control group; ^§between the two study groups at the most recent followup status.