Abstract: Background and Objectives: Total knee arthroplasty (TKA) is an effective and terminal surgical treatment for arthritis of knee joint. The aim of this study was to evaluate the influence of Posterior Condylar offset (PCO) ratio on range of motion after posterior cruciate ligament (PCL) retaining TKA and PCL substitution TKA.
Methods: This was a prospective trial, comparing PCL-substitution TKA with PCL-retaining PKA in patients requiring primary TKA. The study subjects were randomly allocated into two groups, 32 each. Baseline and endpoint Knee Society scores (KSS) were used to assess functional outcomes. Follow up assessments were conducted at baseline, 1 month, 3 months and 6 months after surgery.
Results: The mean age of study subjects was 61.52 ± 7.48 years. In the cruciate substituting group, 61.29% (19) were men. In the cruciate retaining group 60.61% (20) were women. The posterior condylar offset ratio was significantly lesser in the cruciate substituting group (p<0.01). A significant difference in improvement in flexion across time points was observed in cruciate-retaining group (p<0.001) and cruciate-substituting group (p<0.001). A significant difference in improvement in extension across time points was observed in cruciate-retaining group (p<0.001) and cruciate-substituting group (p<0.004). No significant association between PCO and improvement in flexion or extension was observed in patients undergoing PCL-retaining TKA or PCL-substitution TKA.
Conclusions: Significant improvement in flexion and extension after CR and CS TKA was observed. The difference in improvement in flexion and extension between CR and CS TKA was not significant. No influence of PCOR on flexion and extension was observed.
