Posterior condylar offset changes not correlated with knee flexion following TKA

Yoshinori Ishii

COPENHAGEN, Denmark — Changes in posterior condylar offset of the femur does not appear to have a correlation to changes observed in the medial and lateral posterior condylar offsets following total knee arthroplasty, according to a study presented here.

The findings were shared by Yoshinori Ishii, MD, at the 12th EFORT Congress 2011.

“The purpose of this study was to expand our previous results and analyze the correlation between changes in each posterior condylar offset (PCO) and the post flexion angle,” Ishii said.

Ishii’s team used CT and X-ray evaluations to compare preoperative and postoperative total knee arthroplasty (TKA) results in each PCO. A total of 109 knees in 97 patients were investigated in the study.

The team found, on average, the medial PCO was significantly larger preoperatively with the lateral PCO being significantly postoperatively. X-ray evaluation of PCO changes demonstrated no significant correlation with those changes the group identified in CT scans of the medial and lateral PCOs.

Based on his team’s results, Ishii suggested CT-based evaluation of the PCO by the condyle when performing an assessment of the influence of PCO on postoperative range of motion in TKA cases.

“We found that changes in individual posterior condylar offset were not correlated with knee flexion with current prosthesis designs,” Ishii said. “Taking the current study into account, changes in the posterior condylar offset should be assessed individually for each condyle toward various design prostheses to overcome the limitations of the two-dimensional procedure.”

Reference:

Ishii Y, Noguchi H, Takeda M, Sato J. Changes in the medial and lateral posterior condylar offset in total knee arthroplasty. Paper #88. Presented at the 12th EFORT Congress 2011. June 1-4. Copenhagen, Denmark.

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