Tóm tắt

Objectives: To assess the restoration of limb axial alignment and determine joint angles post-operation. Subjects and methods: A retrospective study on 64 patients including 38 females and 26 males who underwent total knee arthroplasty (TKA) using types of prostheses at 103 Military Hospital from January 2015 to January 2018. The extramedullary alignment guide were used for the proximal tibia resection. For each patient, full-length weight-bearing antero-posterior conventional radiography were measured for pre- and post-surgical knee joint angles according to Timothy L. Kahn et al: femorotibial angles, anatomical lateral distal femoral angles, and anatomical medial proximal tibial angles. Results: Parameters on conventional radiography pre- and post-operation: Anatomical lateral distal femoral angles: Valgus: 50% and 9.37%, neutral: 21.87% and 59.38%; varus: 28.13% and 31.25%; anatomical medial proximal tibial angles: Valgus: 9.37% and 18.75%, neutral: 6.25 and 50%; varus: 84.38% and 31.25%; femorotibial angles: Valgus: 9.39% and 3.12%, neutral: 21.86% and 84.38%; varus: 68.75% and 12.5%. Conclusion: This technique improved significantly limb axial alignment, proximal tibial angles, lateral distal femoral angles. However, there still exists cases of axial displacement. These limitations might be due to not having scanogram of standing AP view of the lower extremities taken from hips to ankles and used extramedullary tibial guide. * Keywords: Primary total knee arthroplasty; Radiographic measures.

Abstract

Objectives: To assess the restoration of limb axial alignment and determine joint angles post-operation. Subjects and methods: A retrospective study on 64 patients including 38 females and 26 males who underwent total knee arthroplasty (TKA) using types of prostheses at 103 Military Hospital from January 2015 to January 2018. The extramedullary alignment guide were used for the proximal tibia resection. For each patient, full-length weight-bearing antero-posterior conventional radiography were measured for pre- and post-surgical knee joint angles according to Timothy L. Kahn et al: femorotibial angles, anatomical lateral distal femoral angles, and anatomical medial proximal tibial angles. Results: Parameters on conventional radiography pre- and post-operation: Anatomical lateral distal femoral angles: Valgus: 50% and 9.37%, neutral: 21.87% and 59.38%; varus: 28.13% and 31.25%; anatomical medial proximal tibial angles: Valgus: 9.37% and 18.75%, neutral: 6.25 and 50%; varus: 84.38% and 31.25%; femorotibial angles: Valgus: 9.39% and 3.12%, neutral: 21.86% and 84.38%; varus: 68.75% and 12.5%. Conclusion: This technique improved significantly limb axial alignment, proximal tibial angles, lateral distal femoral angles. However, there still exists cases of axial displacement. These limitations might be due to not having scanogram of standing AP view of the lower extremities taken from hips to ankles and used extramedullary tibial guide. * Keywords: Primary total knee arthroplasty; Radiographic measures.