Comparison of the static tibia-hindfoot angle and arch height between the Oxford Foot Model (OFM) and a full weight bearing 3D-imaging (PedCAT)

The understanding of the effect of BMI on foot dimensions under different weight bearing conditions can help in the design and production of a comfortable and efficient foot support. This study is aimed at using Body Mass Index (BMI) to correlate the foot dimensions of males and females under different weight bearing conditions. The foot dimensions of 320 subjects (160 males and 160 females) between the age range of 19 and above with normal foot were measured under three weight bearing conditions: non-weight bearing, semi-weight bearing, and full-weight bearing. Height, weight and BMI of the individuals were recorded. The data collected was analysed using SPSS software version (20). Paired sample t-test and Pearson correlation coefficient test was done for calculating the statistical significance. The change in foot breadth of semi-weight bearing condition (FBSN) produced a significant correlation with BMI(p<0.05) but that with Foot length (FLSN) and Arch height (AHSN) was not statistically significant for the males. Also, the change in Foot length of full weight bearing condition (FLFN), Foot breadth (FBFN) and Arch height (AHFN) was not statistically significant for the males. There was significant correlation between BMI and the change in foot dimensions such as FLFN, AHSN, AHFN (p<0.05) but that with FLSN, FBSN and FBFN was not statistically significant for the females. Not all foot dimensions can be significantly influenced by BMI. This study is useful in considering the effect of BMI in the change of foot shape in weight-bearing during the selection of shoe size and shoe or insole design and construction and to the orthotics during the design of fitting devices for foot support. Also, it can be useful in forensic science.

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FULL WEIGHT BEARING KINEMATIC MRI STUDY OF TT-TG DISTANCE: COMPARING PATIENTS WITH PATELLOFEMORAL PAIN TO HEALTHY INDIVIDUALS

Medicinos teorija ir praktika ◽

10.15591/mtp.2015.100 ◽

2015 ◽

Vol 21 (4.1) ◽

pp. 638-642

Author(s):

Andrius Brazaitis ◽

Algirdas Tamosiunas ◽

Janina Tutkuviene

Keyword(s):

Patellar Instability ◽

Weight Bearing ◽

Patellofemoral Pain ◽

Full Weight Bearing ◽

Trochlear Groove ◽

Patellar Tilt ◽

Full Extension ◽

Low Degrees ◽

Mri Study ◽

Kinematic Magnetic Resonance Imaging

Purpose. The aim of the present study was to investigate tibial tuberosity-trochlear groove (TT-TG) distance dynamics in patients with patellofemoral pain (PFP) and pain free individuals by using full weight bearing kinematic magnetic resonance imaging (MRI) And correlation with patellar instability. Materials and methods. 51 female individuals with PFP and 26 pain free female individuals participated in the study. The kinematic MRI was performed with 1,5 T MRI unit and full-weight bearing. TT-TG distance, bissect offset (BSO) and patellar tilt angle (PTA) were measured in steps of 10° between 50° of flexion to full extension. Results. The TT–TG was higher in PFP patients compared to volunteers’ from 40° to full extension. This difference was statistically significant (p<0.01). PFP patients demonstrated statistically significantly greater TT-TG distance increase from 30° to full extension. BSO and PTA were moderately correlated to TT-TG from 20° of flexion to full extension. Conclusion. TT-TG distance is dynamic and increases significantly during extension in patients with PFP and pain free individuals, depending on knee flexion angle. It shows different pattern of dynamics in PFP group. TT-TG distance is associated with patellar instability (BSO and PTA) at low degrees of flexion.

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Differences in femoral component subsidence rate after THA using an uncemented collarless femoral stem: full weight-bearing with an enhanced recovery rehabilitation versus partial weight-bearing

Archives of Orthopaedic and Trauma Surgery ◽

10.1007/s00402-021-03913-0 ◽

2021 ◽

Author(s):

Franziska Leiss ◽

Julia Sabrina Götz ◽

Matthias Meyer ◽

Günther Maderbacher ◽

Jan Reinhard ◽

...

Keyword(s):

Risk Factors ◽

Enhanced Recovery ◽

Weight Bearing ◽

Femoral Stem ◽

Full Weight Bearing ◽

Partial Weight Bearing ◽

Fill Ratio ◽

Stem Subsidence ◽

Partial Weight

Abstract Background Femoral component subsidence is a known risk factor for early failure of total hip arthroplasty (THA) using cementless stems. The aim of the study was to compare an enhanced recovery concept with early full weight-bearing rehabilitation and partial weight-bearing on stem subsidence. In addition, the influence of patient-related and anatomical risk factors on subsidence shall be assessed. Methods One hundred and fourteen patients underwent primary cementless THA and were retrospectively analyzed. Sixty-three patients had an enhanced recovery rehabilitation with early full weight-bearing and 51 patients had rehabilitation with partial weight-bearing (20 kg) for 6 weeks. Postoperative subsidence was analyzed on standing pelvic anterior–posterior radiographs after 4 weeks and 1 year. Subsidence was measured in mm. Anatomical and prosthetic risk factors (stem size, canal flare index, canal fill ratio as well as BMI and demographic data) were correlated. Results Femoral stem subsidence rate was significantly higher for the group with an enhanced recovery concept compared to the group with partial weight-bearing at the first radiological follow up after 4 weeks [2.54 mm (SD ± 1.86) vs. 1.55 mm (SD ± 1.80)] and the second radiological follow up after 1 year [3.43 mm (SD ± 2.24) vs. 1.94 (SD ± 2.16)] (p < 0.001, respectively). Stem angulation > 3° had a significant influence on subsidence. Canal flare index and canal fill ratio showed no significant correlation with subsidence as well as BMI and age. Conclusion In the present study, cementless stem subsidence was significantly higher in the group with enhanced recovery rehabilitation compared to partial weight-bearing. Small absolute values and differences were demonstrated and therefore possibly below clinical relevance. Anatomical radiological parameters and anthropometric data did not appear to be risk factors for stem subsidence.

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Finite element analysis of double‐plate fixation using reversed locking compression‐distal femoral plates for Vancouver B1 periprosthetic femoral fractures

BMC Musculoskeletal Disorders ◽

10.1186/s12891-021-04152-5 ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Daisuke Takahashi ◽

Yoshihiro Noyama ◽

Tsuyoshi Asano ◽

Tomohiro Shimizu ◽

Tohru Irie ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Plate Fixation ◽

Weight Bearing ◽

Femoral Fractures ◽

Full Weight Bearing ◽

Loading Test ◽

Lateral Plate ◽

Element Analysis ◽

Periprosthetic Femoral Fractures

Abstract Background Internal fixation is recommended for treating Vancouver B1 periprosthetic femoral fractures. Although several fixation procedures have been developed with high fixation stability and union rates, long-term weight-bearing constructs are still lacking. Therefore, the aim of the present study was to evaluate the stability of a double-plate procedure using reversed contralateral locking compression-distal femoral plates for fixation of Vancouver B1 periprosthetic femoral fractures under full weight-bearing. Methods Single- and double-plate fixation procedures for locking compression-distal femoral plates were analysed under an axial load of 1,500 N by finite element analysis and biomechanical loading tests. A vertical loading test was performed to the prosthetic head, and the displacements and strains were calculated based on load-displacement and load-strain curves generated by the static compression tests. Results The finite element analysis revealed that double-plate fixation significantly reduced stress concentration at the lateral plate place on the fracture site. Under full weight-bearing, the maximum von Mises stress in the lateral plate was 268 MPa. On the other hand, the maximum stress in the single-plating method occurred at the defect level of the femur with a maximum stress value of 1,303 MPa. The principal strains of single- and double-plate fixation were 0.63 % and 0.058 %, respectively. Consistently, in the axial loading test, the strain values at a 1,500 N loading of the single- and double-plate fixation methods were 1,274.60 ± 11.53 and 317.33 ± 8.03 (× 10− 6), respectively. Conclusions The present study suggests that dual-plate fixation with reversed locking compression-distal femoral plates may be an excellent treatment procedure for patients with Vancouver B1 fractures, allowing for full weight-bearing in the early postoperative period.

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Non-locking buttress plate in distal tibial metaphyseal fractures

Medical Journal of Pokhara Academy of Health Sciences ◽

10.3126/mjpahs.v1i2.23401 ◽

2018 ◽

Vol 1 (2) ◽

pp. 87-91

Author(s):

Norman Lamichhane ◽

Bhogendra Bahadur KC ◽

Chandra Bahadur Mishra ◽

Sabita Dhakal

Keyword(s):

Soft Tissue ◽

Weight Bearing ◽

Delayed Union ◽

Full Weight Bearing ◽

Distal Fibula ◽

Fibula Fracture ◽

Group A ◽

The Mean ◽

Group B ◽

Metaphyseal Fractures

Background: Treatment of distal tibial metaphyseal fractures is often challenging and no single technique has been unanimously advocated. Open reduction and internal fixation with plates and screws allows better restoration of anatomical alignment but with more soft tissue complication. Simultaneous fixation of the fibula is not universally carried out. This study aims at evaluation of the outcome of plating technique and the effect of fixation of fibula fracture in treatment of distal tibial metaphyseal fractures. Material and methods: Thirty-one cases (14 cases in Group A with concomitant distal fibula fracture and 17 cases in Group B without distal fibula fracture) were analyzed retrospectively for the mean duration of full weight bearing, mean union time and complications, and compared. Results: The mean time for full weight bearing and radiological union in our study was 14.2 weeks (15.9 in Group A and 13.1 in Group B) and 23.8 weeks (26.6 in Group A and 21.5 in Group B) respectively. 16.1% of cases had post-operative complications including one case of deep infection and malalignment of 6 degree varus (following delayed union) was seen in one case of Group A. Range of motion (ROM) at ankle was not problem in any of the cases except the one delayed union which had 5 degrees of dorsiflexion and 15 degrees of plantiflexion. Conclusion: Open reduction and internal fixation with plate and screws in distal tibial metaphyseal fracture is more economic means of treatment modality with comparable incidence of post-union malalignment and union time,though more soft tissue complications compared to other modalities. Fixation of fibula fracture aids in reducing the incidence of malalignment.

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