Short-Term Results of Patient Specific Instruments (PSI) – Total Knee Replacement (TKR)

Mahmoud, Mohamed Mosa Mohamed; Amr, Amr Abdelhalem; Hafez, MA

doi:10.21608/ejhm.2020.124803

Short-Term Results of Patient Specific Instruments (PSI) – Total Knee Replacement (TKR)

Document Type : Original Article

Authors

¹ Department of Orthopaedic and Trauma Surgery, Faculty of Medicine, Al Azhar University, Assiut Branch

² Department of Orthopaedic and Trauma Surgery, Faculty of Medicine, 6 October University

10.21608/ejhm.2020.124803

Abstract

Background: TKR is an effective treatment for severely arthritic knees. PSI TKR is a recent technique, which relies on preoperative formulation of specific instruments for every patient preoperatively, aiming at decreasing surgical time and instruments and increasing accuracy and functional outcome. Objective: Assessment of functional and radiological outcome of PSI TKR after a period of 3 years duration. Patients and Methods: 40 TKRs in 24 patients were done using CT-based PSI technique. Pre-and postoperative knee society score (KSS) were measured and digital long-leg X-rays were obtained for all patients. Hip-knee-ankle, proximal tibia land lateral distal femoral angles together with mechanical axis deviation were measured for all patients to assess the mechanical axis alignment after TKR. Results: HKA (hip knee ankle) has decreased from 4.70 varus preoperatively to 1.27 varus. The mean knee society score had markedly increased from 31.2 preoperatively to 85.3 with fair to excellent KSS was 95% after 3 years duration. Conclusion: PSI TKR is an effective technique in knee replacement as conventional method. With the advantages of reduction of the operative steps and concurrent potential complications.

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