TABLE 2.

SST Performance Times in Patients Who Underwent Unilateral Total Knee Arthroplasty and Those in the Matching Limbs of Control Subjects

Test	IE*	3 mo*	1 y*	Controls†
SST surgical limb	33.9 ± 11.8 (P<.001); 135	23.3 ± 7.6 (P = .007); 145	20.9 ± 5.7 (P = .540); 123	20.3 ± 6.8; 61
SST nonsurgical limb	29.5 ± 10.9 (P<.001); 142	22.0 ± 7.0 (P = .012); 144	21.1 ± 6.3 (P = .120); 123	19.7 ± 5.4; 61

Abbreviations: IE, initial outpatient physical therapy evaluation; SST, single-step test.

^*Values are mean ± SD seconds (P); n. P values are reported for equal variances, not assumed, and indicate difference from the respective control group.

^‡Values are mean ± SD seconds; n.