Mid-term results and factors affecting outcome of a metal-backed unicompartmental knee design: a case series

Table 2 Clinical and radiographic characteristics before and after UKA

Variables	Pre-operative [SD]	Final follow-up [SD]	P value^a
Knee Society Scoring System
Mean objective score (points)	49 [9]	95 [4]	< 0.01
Mean functional score (points)	48 [10]	92 [7]	< 0.01
Radiographic Characteristics
Mean femoral angle (degrees)	97 [2]	97 [3]	< 0.01
Mean tibial angle (degrees)	84 [2]	84 [2]	0.81
Mean medial joint space (millimeters)	1.0 [1.0]	2.9 [1.6]	< 0.01
Mean lateral joint space (millimeters)	6.0 [2.0]	5.7 [1.9]	0.19
Mean patellar medial joint space (millimeters)	2.6 [1.6]	2.7 [2.0]	0.98
Mean patellar central joint space (millimeters)	3.6 [2.1]	3.2 [2.2]	0.04
Mean patellar lateral joint space (millimeters)	2.7 [1.9]	2.3 [1.8]	0.07
Presence of patellar osteophytes (percent of patients)	48	38	0.31
Alpha angle (degrees)	---	87 [4]	---
Beta angle (degrees)	---	82 [6]	---

SD = standard deviation
^ap values were calculated based on Wilcoxon matched-pairs signed-ranks tests for continuous variables and chi-squared tests for categorical variables

ISSN: 1749-799X