Influence of femoral joint obliquity in TKA
ESSKA Academy. SANCHEZ-SOLER J. 11/07/19; 286429; epEKA-65 Topic: G4 - Tricompartmental (Simple) arthroplasty
Juan Francisco SANCHEZ-SOLER
Juan Francisco SANCHEZ-SOLER
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Abstract
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Objective:
  1. Determine if femoral obliquity (FO) change in Total Knee Arthroplasty (TKA)
  2. To correlate this FO with TKA results
Material and methods: Consecutive patients underwent TKA in the same center during a year were included.
Preoperative FO, angle between the line joining the femoral condyles in the frontal plane and a horizontal line parallel to the ground, was measured by telemetric radiographs, considering positive values FO in "varus" and negative in "valgus". In the same telemetric radiographs, FT was measured. The Knee Society Socore (KSS), knee (KSS R) and function scale (KSS F) were collected.
One year after, the same postoperative variables were collected.
A correlation study of the FO, preoperative (preop), postoperative (postop) and differential (diff) with KSS R and F, preop, postop and diff was performed. Moreover a correlation study of FT axis with the FO.
Finally, a comparative study of 3 groups was performed according to FO postop, group 1 (FO between 0-4º), group 2 (OF≥5º) and group 3 (negative FO, < 0º).
Results: 481 patients were included,21 loss of follow-up, 460 completed the study. The FO average preop was -0.01º and postop 3.3º (p < 0.01).
We found a weak correlation between the FO preop and the KSS R preop (r 0.13 p< 0.01) and KSS F preop (r 0.12 p < 0.01).
We found a weak correlation between FO postop with KSS F postop (r 0.14) and KSS F diff (r 0.15), p < 0.01 in both cases.
We also found a weak correlation between FO diff and KSS F diff (r 0.16 p < 0.00), without correlation and KSS R.
FO diff showed a weak / moderate inverse correlation with FT axis diff (r -0.27 p < 0.00), although we did not find a correlation between FT axis diff and KSS F or R diff.
In stratification groups under study we obtained 268 patients in group 1, 146 in group 2 and 34 in group 3. Patients in group 1 and those in group 2 did not present differences in KSS preop, postop or diff. Patients in group 3 showed significantly lower values ​​in the KSS F postop (82.8 vs 83.9 vs 68.9, p < 0.01) and KSS F diff (31 vs 32.9 vs 17.8, p < 0.01), without differences in the rest of variables studied.
Conclusions: In TKA change FO.
FO preop is weakly related to KSS R and F preop. FO postop and diff is weakly related to the functional subscale of KSS, postop and diff.
FO correlates with FT mechanical axis but independently with KSS.
Patients with a postoperative FO < 0º (femoral component "in valgus"), independently of FT axis, present worse functional results.
Objective:
  1. Determine if femoral obliquity (FO) change in Total Knee Arthroplasty (TKA)
  2. To correlate this FO with TKA results
Material and methods: Consecutive patients underwent TKA in the same center during a year were included.
Preoperative FO, angle between the line joining the femoral condyles in the frontal plane and a horizontal line parallel to the ground, was measured by telemetric radiographs, considering positive values FO in "varus" and negative in "valgus". In the same telemetric radiographs, FT was measured. The Knee Society Socore (KSS), knee (KSS R) and function scale (KSS F) were collected.
One year after, the same postoperative variables were collected.
A correlation study of the FO, preoperative (preop), postoperative (postop) and differential (diff) with KSS R and F, preop, postop and diff was performed. Moreover a correlation study of FT axis with the FO.
Finally, a comparative study of 3 groups was performed according to FO postop, group 1 (FO between 0-4º), group 2 (OF≥5º) and group 3 (negative FO, < 0º).
Results: 481 patients were included,21 loss of follow-up, 460 completed the study. The FO average preop was -0.01º and postop 3.3º (p < 0.01).
We found a weak correlation between the FO preop and the KSS R preop (r 0.13 p< 0.01) and KSS F preop (r 0.12 p < 0.01).
We found a weak correlation between FO postop with KSS F postop (r 0.14) and KSS F diff (r 0.15), p < 0.01 in both cases.
We also found a weak correlation between FO diff and KSS F diff (r 0.16 p < 0.00), without correlation and KSS R.
FO diff showed a weak / moderate inverse correlation with FT axis diff (r -0.27 p < 0.00), although we did not find a correlation between FT axis diff and KSS F or R diff.
In stratification groups under study we obtained 268 patients in group 1, 146 in group 2 and 34 in group 3. Patients in group 1 and those in group 2 did not present differences in KSS preop, postop or diff. Patients in group 3 showed significantly lower values ​​in the KSS F postop (82.8 vs 83.9 vs 68.9, p < 0.01) and KSS F diff (31 vs 32.9 vs 17.8, p < 0.01), without differences in the rest of variables studied.
Conclusions: In TKA change FO.
FO preop is weakly related to KSS R and F preop. FO postop and diff is weakly related to the functional subscale of KSS, postop and diff.
FO correlates with FT mechanical axis but independently with KSS.
Patients with a postoperative FO < 0º (femoral component "in valgus"), independently of FT axis, present worse functional results.
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