[Introduction]. As an essential concept in TKA, preparing equalized rectangular extension and flexion
Introduction. Although
Introduction. Appropriate osteotomy alignment and soft tissue balance are essential for the success of total knee arthroplasty (TKA). The management of soft tissue balance still remains difficult and it is left much to the surgeon's subjective feel and experience. We developed an offset type tensor system for TKA. This device enables objective soft tissue balance measurement with more physiological joint conditions with femoral trial component in place and patello-femoral (PF) joint reduced. We have reported femoral component placement decreased extension
Introduction. Patient specific surgical guide (PSSG) is a relatively new technique for accurate total knee arthroplasty (TKA), and there are many reports supporting PSSG can reduce the rate of outlier in the coronal plane. We began to use PSSG provided by Biomet (Signature®) and have reported the same results. Before using Signature, we performed TKA by modified
Introduction. Infected big
INTRODUCTION. Mechanical alignment in TKA introduces significant anatomic modifications for many individuals, which may result in unequal medial-lateral or flexion-extension bone resections. The objective of this study was to calculate bone resection thicknesses and resulting
Background. There are few reports including natural course of initial
INTRODUCTION. The results of modified
Background. Adjusting the joint
INTRODUCTION. The extension and flexion
Inverse Kinematic Alignment (iKA) and
Mechanical alignment (MA) techniques for total knee arthroplasty (TKA) may introduce significant anatomic modifications, as it is known that few patients have neutral femoral, tibial or overall lower limb mechanical axes. A total of 1000 knee CT-Scans were analyzed from a database of patients undergoing TKA. MA tibial and femoral bone resections were simulated. Femoral rotation was aligned with either the trans-epicondylar axis (TEA) or with 3° of external rotation to the posterior condyles (PC). Medial-lateral (DML) and flexion-extension (DFE)
In unicompartmental knee arthroplasty (UKA), extension
Backgrounds. It is well accepted that
Computer assisted total knee arthroplasty helps in accurate and reproducible implant positioning, bony alignment, and soft-tissue balancing which are important for the success of the procedure. In TKR, there are two surgical techniques one is measured resection in which bony landmarks are used to guide the bone cuts and the other is
Mechanical alignment (MA) techniques for total knee arthroplasty (TKA) introduces significant anatomic modifications and secondary ligament imbalances. A restricted kinematic alignment (rKA) protocol was proposed to minimise these issues and improve TKA clinical results. A total of 1000 knee CT-Scans were analyzed from a database of patients undergoing TKA. rKA tibial and femoral bone resections were simulated. rKA is defined by the following criteria: Independent tibial and femoral cuts within ± 5° of the bone neutral mechanical axis and, a resulting HKA within ± 3° of neutral. Medial-lateral (ΔML) and flexion-extension (ΔFE)
Aims. The aims of this prospective study were to determine the effect of osteophyte excision on deformity correction and soft- tissue
Flexion instability is a well-defined, though often difficult to diagnose, type of TKA instability. It may also complicate posterior stabilised arthroplasties. It is one of three modes of tibial-femoral instability along with: 1. Varus-valgus or coronal plane instability and 2. Instability in the plane of motion that results from either fixed flexion contracture and buckling or recurvatum and collapse. The issues for correction of coronal instability are generally alignment and either ligamentous balance or constraint. For plane of motion instability it is full extension without hyperextension and restoration of extensor mechanism power. The issues for flexion instability are basically balanced flexion and extension
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