TITLE:
Postoperative Mechanical Axis Alignment and Components Position after Conventional and Patient-Specific Total Knee Arthroplasty
AUTHORS:
Mohamed Mosa Mohamed, Maher A. El Assal, Ahmed M. Abdel Aal, Yaser E. Khalifa, Mahmoud A. Hafez
KEYWORDS:
Total Knee Arthroplasty, Patient-Specific Templates, Conventional TKA, Mechanical Axis, Limb Alignment, Component Position
JOURNAL NAME:
Open Journal of Orthopedics,
Vol.6 No.8,
August
12,
2016
ABSTRACT: Introduction: Accurate postoperative alignment and implant positioning are determinant factors for successful total knee arthroplasty (TKA). Patient-specific template (PST) is a technique that uses computer technology for the planning, deigning and production of cutting guides. This study aims to compare PST to conventional technique in terms of mechanical axis alignment and component positioning. Patients and method: 109 TKA were performed for 78 patients in 2 groups. Group A included 69 conventional TKA in 55 patients and Group B included 40 patient-specific TKA in 23 patient. Postoperative long-film X-rays were done for all patients to observe the mechanical axis, anatomical axis, lateral distal femoral mechanical angle and medial proximal tibial angle. Results: No statistically significant difference was found between the two groups regarding alignment or component positioning. Conclusion: Both techniques have shown similar results in restoring the mechanical axis and alignment after TKA. However, PST had the advantages of reduced blood loss and shorter operative time.