High tibial osteotomy (HTO) is an effective treatment option in early osteoarthritis. However, preoperative planning and surgical execution can be challenging. Computer assisted three-dimensional (3D) patient-specific instruments (PSI) might helpful tools achieving successful outcomes. Goal of this study was to assess the accuracy HTO using PSI.All medial open wedge PSI-HTO between 2014 2016 were reviewed. Using pre- postoperative radiographs, hip-knee-ankle angle (HKA) posterior slope (PTS)...

Computer assisted corrective osteotomy of the diaphyseal forearm and distal radius based on computer simulation patient-specific guides has been described as a promising technique for accurate reconstruction deformities. Thereby, intraoperative use drill cutting facilitate transfer preoperative plan to surgery. However, difference between planned performed reduction is difficult assess with conventional radiographs. The aim this study was evaluate accuracy surgical postoperative...

Sarcomas are associated with a relatively high local recurrence rate of around 30 % in the pelvis. Inadequate surgical margins most important reason. However, obtaining adequate is particularly difficult this anatomically demanding region. Recently, three-dimensional (3-D) planning, printed models, and patient-specific instruments (PSI) cutting blocks have been introduced to improve precision during tumor resection. This case series illustrates these modern 3-D tools pelvic surgery. The...

The asymmetry of the medial and lateral knee compartments contributes significantly to femorotibial biomechanics pivoting, it is reported be a relevant risk factor for an anterior cruciate ligament (ACL) injury.(1) To assess role femoral condyle sphericity as ACL rupture rerupture. (2) compare new with existing bony morphological factors via magnetic resonance imaging (MRI) most predictive rupture.Cohort study; Level evidence, 3.A retrospective case-control study 60 patients was conducted....

The accurate reduction of tibial plateau malunions can be challenging without guidance. In this work, we report on a novel technique that combines 3-dimensional computer-assisted planning with patient-specific surgical guides for improving reliability and accuracy complex intraarticular corrective osteotomies. Preoperative based bone models was performed to simulate fragment mobilization in 3 cases. Surgical implementation the preoperative plan using cutting evaluated; benefits limitations...

Abstract Purpose The multifactorial nature of patellofemoral instability requires a comprehensive assessment the affected patients. While an association between tibial tuberosity (TT) torsion and is known, its specific effect has not yet been investigated. This study investigated TT on instability. Methods retrospective cohort compared patients who underwent surgical intervention for asymptomatic controls. was measured in addition to other commonly assessed risk factors using standardised...

Abstract Background Deformity assessment and preoperative planning of realignment surgery are conventionally based on weight-bearing (WB) radiographs. However, newer technologies such as three-dimensional (3D) surgical navigation with patient-specific instruments (PSI) rely non-weight bearing (NWB) computed tomography (CT) data. Additionally, differences between conventional two-dimensional (2D) 3D measurements known. The goal the present study was to systematically analyse influence WB...

Background: Tibiofemoral rotation is an emerging parameter, especially in assessing patellofemoral instability. However, reference values the literature are inconsistent regarding used imaging modality and do not consider effect of knee flexion during image acquisition. Purpose: To analyze differences tibiofemoral measurements between computed tomography (CT) magnetic resonance (MRI). Study Design: Cross-sectional study; Level evidence, 3. Methods: A total 78 knees 72 patients were included....

PurposeTo analyze the difference of sagittal tibial tubercle trochlear-groove (sTTTG) on magnetic resonance imaging (MRI) and computer tomography (CT) to assess influence knee flexion angle (KFA) tibiofemoral (TF) rotation sTTTG.MethodsAll patients between January 2019 July 2023 who underwent patellar stabilizing surgery for instability at a single institution were included in current study. Patients when preoperative MRI assessed standardized CT full extension lower extremity was available....

Background: Distal femoral osteotomy (DFO) can be used to simultaneously correct coronal and rotational deformities. Patient-specific instruments (PSIs) are known helpful in such complex osteotomies, but data on surgical accuracy for the combined correction of deformities femur missing. Purpose: To investigate radiological results DFO simultaneous using PSIs. Study Design: Case series; Level evidence, 3. Methods: All included patients underwent (34 patients, 36 knees) PSIs The hip-knee-ankle...

Background: The presence of a supratrochlear spur has been shown to influence outcomes in patients with trochlear dysplasia and is thought accelerate cartilage wear. However, the current literature does not provide an evidence-based threshold for relevant height. Purpose/Hypothesis: purpose this study was establish clinically significant height associated patellofemoral chondral damage guide surgeons surgical decision-making. It hypothesized that negatively affects articular cartilage, large...

Background: Sulcus-deepening trochleoplasty is a well-established treatment option for patients presenting with severe trochlear dysplasia and patellar instability. However, concerns remain regarding its influence on cartilage integrity in the patellofemoral (PF) joint. Purpose: To assess midterm effect of PF treated Study Design: Cohort study; Level evidence, 3. Methods: A total 75 high-grade (Dejour types B C) who underwent stabilizing surgery instability at single institution were...

Intraoperative hinge fractures in distal femur osteotomies represent a risk factor for loss of alignment and non-union. Using finite element analysis, the goal this study was to investigate influence different widths osteotomy corrections on medial closed-wedge lateral open-wedge osteotomies.The located at proximal margin adductor tubercle biplanar upper border femoral condyle osteotomies, corresponding optimal positions described literature. Different (5, 7.5, 10 mm) were created correction...

The goal of this study is (1) to assess differences between two-dimensional (2D) weight-bearing (WB) and three-dimensional (3D) nonweight-bearing (NWB) planning in total knee arthroplasty (TKA) (2) identify factors that influence intermodal differences.

Three-dimensional (3D) deformity assessment and leg realignment planning is emerging. The aim of this study was to (1) validate a novel 3D modality that incorporates the weight-bearing (WB) state (3D WB) by comparing it existing modalities non-weight-bearing (NWB), 2D (2) evaluate influence (2D vs. 3D) WB condition on measurements. Three different measurement protocols were analyzed in 19 legs underwent medial open-wedge high tibial osteotomy (HTO): protocol, after 2D/3D registration CT...

Abstract Purpose Three-dimensional (3D) preoperative planning has become the gold standard for orthopedic surgeries, primarily relying on CT-reconstructed 3D models. However, in contrast to standing radiographs, a CT scan is not part of protocol but usually acquired purposes only. Additionally, it costly, exposes patients high doses radiation and non-weight-bearing position. Methods In this study, we develop deep-learning based pipeline facilitate tibial osteotomies, models reconstructed...

Abstract Purpose An increased value of tibiofemoral rotation is frequently observed in patients with patellofemoral instability or maltracking. Nevertheless, the appropriate approach for addressing this parameter remains unclear so far. One potential correcting femoral rotational osteotomy. We hypothesized that osteotomy affects rotation. Methods All who underwent between January 2018 and May 2022 were included study. Pre‐ postoperative degree measured using two‐dimensional (2D)...