Spontaneous Osteonecrosis of the Knee: A Retrospective Analysis by Using MRI and DEXA

Table 1: Comparisons of baseline variables in operation and conservative group.

	Operation group (n=10)	Conservative group (n=10)	p-value
Age (years)	77±7.9	82±6.4	0.150^a
Height (cm)	155±3.2	152±5.1	0.012^a
Weight (kg)	56.8±7.9	52.2±4.6	0.039^a
BMI (kg/m²)	24±3.0	25.1±3.6	0.201^a
BMD: femur (g/cm²)	0.454±0.085	0.489±0.092	0.438^a
BMD: lumbar spine (g/cm²)	0.595±0.032	0.562±0.048	0.052^a
K-L grade I (n)	4	6	0.158^b
K-L grade II (n)	6	4	0.205^b
FTA	173	172	0.204^b

^a Student's t-test
^b χ² test