Table 3.

An analysis of preoperative radiograph to navigation discrepancy*

Discrepancy	Number	Minimum	Maximum	Mean	Standard deviation
Mechanical axis greater than 15°	9	4.00	12.00	7.4444	2.35112
Mechanical axis 11° to 14°	14	1.00	10.00	5.4286	2.50275
Mechanical axis 6° to 10°	19	.00	8.00	3.8421	2.29161
Mechanical axis −5° to 5°	6	1.00	3.00	1.5000	.83666
Mechanical axis −10 to −6	2	7.00	10.00	8.5000	2.12132
Mechanical axis −15° to −11°	2	0	5.00	2.5000	3.53553
Mechanical axis less than −15°	0	—	—	—	—

* Defined by preoperative radiograph mechanical axis measurements.