Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Apr 2018
Femoral component alignment in unicompartmental knee arthroplasty leads to biomechanical change in contact stress and collateral ligament force in knee joint.
In recent years, the popularity of unicompartmental knee arthroplasty (UKA) has increased. However, the effect of femoral component positioning in UKA continues to invite a considerable debate. The purpose of this study involved assessing the biomechanical effect of mal-alignment in femoral components in UKA under dynamic loading conditions using a computational simulation. ⋯ The results of the study confirm the importance of conservation in post-operative accuracy of the femoral component since the valgus and varus femoral malalignments affect the collateral ligament and lateral compartment, respectively. Our results suggest that surgeons should avoid valgus malalignment in the femoral component and especially malalignment exceeding 9°, which may induce higher medial collateral ligament forces.
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Arch Orthop Trauma Surg · Apr 2018
Posterolateral tibial plateau fractures, how to buttress? Reversed L posteromedial or the posterolateral approach: a comparative cadaveric study.
The selection of a surgical approach for buttressing posterolateral tibial plateau fractures is controversial. ⋯ The PL approach provides better access for buttressing the posterolateral tibial plateau fracture than the R-PM approach. With the R-PM approach, the blind area on the lateral plateau which can be accessed only by the PL approach starts approximately at 43.72% and ends at 81.41% of the lateral tibial plateau width. When a fracture is located in this zone, the posterolateral approach is recommended.
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Arch Orthop Trauma Surg · Apr 2018
Is there a relationship between the load distribution on the tibial plateau and hip knee ankle angle after TKA?
This study asked whether differences in coronal alignment after total knee arthroplasty (TKA) affect the load distribution on the tibial plateau. The aim of this study was to investigate the correlation between coronal alignment and the load distribution on the tibial plateau after TKA, using three-dimensional multi-detector-row-computed tomography (3D-MDCT). ⋯ Therapeutic study, Level III.
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Short stems were developed as a bone-conserving alternative especially for the young hip arthroplasty patient. Patients suffering from osteonecrosis of the femoral head are frequently younger than primary arthritis patients. The outcome of short stems in these patients remains unclear. The aim of our study was to compare mid-term survival of short stems after osteonecrosis of the femoral head (ONFH) and primary arthritis. ⋯ Our study showed elevated short stem loosening rates after ONFH. Similar results are published for classic cementless stems. The question of which stem is best for the young osteonecrosis patient cannot be answered yet. Consecutive studies directly comparing loosening rates of short and classic cementless stems in young osteonecrosis patients are required.
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Arch Orthop Trauma Surg · Apr 2018
Case Reports3D printing lunate prosthesis for stage IIIc Kienböck's disease: a case report.
Stage IIIc Kienböck's disease is a clinical challenge to treat collapse of the lunate bone. A new reconstructive surgery was described in one patient using 3D printing lunate prosthesis. ⋯ The visual analog scale scores and Cooney scores were 2 points and 91 points. We demonstrated that an anatomical reconstruction to Kienböck's Disease is possible using 3D printing lunate prosthesis.