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Table 1 Measurements of preoperative, planned, and postoperative alignments and MAE between the planned and postoperative alignments

From: Closed-leg standing long leg radiographs can be a useful tool to assess whether the joint line is parallel to the ground in restricted kinematic alignment total knee arthroplasty

 

Preoperative

Planned

Postoperative

Mean

Range

SD

Mean

Range

SD

Mean

Range

SD

HKA

-9.4

-24.0 to 6.5

5.7

-2.0

-7.0 to 3.0

1.9

-2.6

-12.5 to 3.5

3.2

     

absolute error

1.7

0 to 7.7

1.6

LDFA

88.8

78.0 to 98.0

3.2

88.8

85.0 to 95.0

2.4

89.5

83.5 to 95.5

3.1

     

absolute error

1.6

0 to 9.0

1.7

MPTA

84.1

77.5 to 90.5

2.6

86.8

85.0 to 92.0

1.7

86.9

82.0 to 91.0

2.1

     

absolute error

1.3

0 to 5.0

1.0

JLOA

-0.1

-6.5 to 8.0

2.8

parallel to the floor

-2.1

-6.0 to 3.0

2.0

     

absolute error

2.4

0 to 6.0

1.6

  1. Varus measurements are negative, valgus measurements are positive in HKA. The tibial joint line slanted down to the medial side is expressed as a positive value in JLOA. Abbreviations: HKA Hip-knee-ankle angle, JLOA Joint line orientation angle, LDFA Lateral distal femoral angle, MAE Mean absolute error, MPTA Medial proximal tibial angle, SD Standard deviation