scholarly journals Correction to: Patella–patellar tendon angle and lateral patella-tilt angle decrease patients with chondromalacia patella

2020 ◽  
Vol 28 (8) ◽  
pp. 2722-2722
Author(s):  
Lale Damgacı ◽  
Hamza Özer ◽  
Semra Duran
Keyword(s):  
Patellar Tendon ◽  
Tilt Angle ◽  
Patella Tilt ◽  
Chondromalacia Patella ◽  
Lateral Patella

Patellofemoral joint biomechanics in the females with anterior knee pain applying full weight bearing kinematic MRI

2015 ◽  
Vol 22 (1) ◽  
pp. 47-53
Author(s):  
Andrius Brazaitis ◽  
Algirdas Tamošiūnas ◽  
Janina Tutkuvienė
Keyword(s):  
Tilt Angle ◽  
Patellofemoral Joint ◽  
Weight Bearing ◽  
Full Weight Bearing ◽  
Femoral Rotation ◽  
Full Extension ◽  
Patella Tilt ◽  
Significant Difference ◽  
Joint Biomechanics ◽  
Lateral Patella

Purpose. The aim of the study was to evaluate biomechanics of the patellofemoral joint using full weight bearing kinematic MRI. We postulated that females with unilateral PFP might have greater medial femoral rotation in comparrison to the contralateral knee, also greater lateral patella tilt and displacement. Methods. Forty four females aged 20–40  years with unilateral PFP were included in the study. The kinematic MRI examination was performed with a 1.5 T MRI unit. Full-weight bearing was used. Sagittal and axial images of the patellofemoral joint were acquired with a transmit-receive surface body coil. The study parameters, i. e. bisect offset, patella tilt angle, medial femoral rotation, patellar rotation at 0, 10, 20, 30, 40, 50° of flexion, were measured for both knees. Results. Statistically significant changes were confirmed for greater bisect offset at all angles of flexion. The patella tilt angle increased steadily throughout full extension, but there was no significant difference in the tilt angle at 50° flexion. Greater medial femoral rotation was observed at all degrees of flexion, while patellar rotation showed no difference. Conclusions. Our study has confirmed the growing body of literature, theorizing that the primary cause of PFP pain is altered femur dynamics under relatively stable patella.

scholarly journals Morphological study of the vastus medialis oblique in recurrent patellar dislocation based on magnetic resonance images

2020 ◽  
Author(s):  
Lei Shu ◽  
Xu Yang ◽  
Hangyuan He ◽  
Biao Chen ◽  
Liaobin Chen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Muscle Fibre ◽  
Tilt Angle ◽  
Area Ratio ◽  
Control Group ◽  
Vastus Medialis ◽  
Morphological Parameters ◽  
Sectional Area ◽  
Cross Sectional ◽  
Patella Tilt

Abstract Background: To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability.Methods: The magnetic resonance imaging (MRI) data of seventy-five knees (fifty-four patients) with recurrent lateral patella dislocation (LPD) and seventy-five knees (seventy patients) without recurrent LPD were retrospectively analysed. Five morphological parameters related to the VMO (elevation in the sagittal plane and coronal plane, craniocaudal extent, muscle-fibre angulation, cross-sectional area ratio) and two patella tilt parameters (patella tilt angle, bisect offset ratio) were measured in MR images. The independent-samples t test or chi-square test was used for statistical comparisons.Results: The mean ages of the patients in the recurrent LPD group and control group were 22.1 ± 9.9 years and 24.0 ± 6.5 years, respectively. Eighteen out of seventy-five (24%) patients MRI showed VMO injuries. Compared with the control group, the patients with recurrent LPD showed significantly higher sagittal VMO elevation (10.4 ± 2.3 mm vs 4.1 ± 1.9 mm), coronal VMO elevation (15.9 ± 5.7 mm vs 3.9 ± 3.7 mm), muscle-fibre angulation (35.4 ± 8.0° vs 27.9 ± 6.3°), patella tilt angle (25.9 ± 10.7° vs 9.1 ± 5.2°), and bisect offset ratio values (0.9 ± 0.3 vs 0.5 ± 0.1) and significantly lower craniocaudal extent (13.7 ± 5.3 mm vs 16.7 ± 5.1 mm) and cross-sectional area ratio values (0.05 ± 0.02 vs 0.07 ± 0.02).Conclusions: The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.

scholarly journals Morphological study of the vastus medialis oblique in recurrent patellar dislocation based on magnetic resonance images

2021 ◽  
Author(s):  
Lei Shu ◽  
Xu Yang ◽  
Hangyuan He ◽  
Biao Chen ◽  
Liaobin Chen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Muscle Fibre ◽  
Tilt Angle ◽  
Area Ratio ◽  
Control Group ◽  
Vastus Medialis ◽  
Morphological Parameters ◽  
Sectional Area ◽  
Cross Sectional ◽  
Patella Tilt

Abstract Background: To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability.Methods: The magnetic resonance imaging (MRI) data of seventy-five knees (fifty-four patients) with recurrent lateral patella dislocation (LPD) and seventy-five knees (seventy patients) without recurrent LPD were retrospectively analysed. Five morphological parameters related to the VMO (elevation in the sagittal plane and coronal plane, craniocaudal extent, muscle-fibre angulation, cross-sectional area ratio) and two patella tilt parameters (patella tilt angle, bisect offset ratio) were measured in MR images. The independent-samples t test or chi-square test was used for statistical comparisons.Results: The mean ages of the patients in the recurrent LPD group and control group were 22.1 ± 9.9 years and 24.0 ± 6.5 years, respectively. Eighteen out of seventy-five (24%) patients MRI showed VMO injuries. Compared with the control group, the patients with recurrent LPD showed significantly higher sagittal VMO elevation (10.4 ± 2.3 mm vs 4.1 ± 1.9 mm), coronal VMO elevation (15.9 ± 5.7 mm vs 3.9 ± 3.7 mm), muscle-fibre angulation (35.4 ± 8.0° vs 27.9 ± 6.3°), patella tilt angle (25.9 ± 10.7° vs 9.1 ± 5.2°), and bisect offset ratio values (0.9 ± 0.3 vs 0.5 ± 0.1) and significantly lower craniocaudal extent (13.7 ± 5.3 mm vs 16.7 ± 5.1 mm) and cross-sectional area ratio values (0.05 ± 0.02 vs 0.07 ± 0.02).Conclusions: The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.

scholarly journals Relationship of Patellofemoral Angles and Tibiofemoral Rotational Angles With Jumper’s Knee in Professional Dancers: An MRI Analysis

2021 ◽  
Vol 9 (3) ◽  
pp. 232596712098522
Author(s):  
Neslihan Aksu ◽  
Vefa Atansay ◽  
Işık Karalök ◽  
Taner Aksu ◽  
Ayhan Nedim Kara ◽  
...  
Keyword(s):  
Patellar Tendon ◽  
Tilt Angle ◽  
Patella Alta ◽  
Jumper’S Knee ◽  
Patellar Tilt ◽  
Sulcus Angle ◽  
Significant Difference ◽  
Mri Scans ◽  
Professional Dancers ◽  
Patellar Tilt Angle

Background: Jumper’s knee is a type of tendinopathy affecting the distal insertion of the quadriceps tendon (25% of cases) or the patellar tendon. It has been shown that frontal-plane measurements, such as genu valgum, genu varum, an increased quadriceps angle, a protuberant tibial tuberosity, patella alta, and short hamstring muscles, may be related to jumper’s knee. Purpose: To investigate the effects of tibiofemoral rotational angles and patellofemoral (PF) angles on the development of jumper’s knee in professional folk dancers. Study Design: Case-control study; Level of evidence, 3. Methods: We examined 26 dancers (16 male, 10 female) with knee pain using magnetic resonance imaging (MRI), for a total of 32 knees. Of the knees, 21 with quadriceps tendinopathy (QT) and 7 with patellar tendinopathy (PT) were detected. Using MRI scans, we measured PF angles (PF sulcus angle, lateral PF angle, patellar tilt angle, lateral trochlear inclination angle, lateral patellar tilt angle, and PF congruence angle) and tibiofemoral rotational angles (condylar twist angle, posterior condylar angle, femoral Insall angle, tibial Insall angle, posterior tibiofemoral angle, and angle between the Whiteside line and posterior femoral condylar line) and noted specifics such as patella alta, patella baja, and the Wiberg classification of the patellar shape between the patients with versus without QT and between patients with versus without PT to understand if there was any relationship with tendinopathy. Results: No statistically significant difference was observed in age, sex, patella alta, or the Wiberg classification between the QT groups (with vs without) and between the PT groups (with vs without) ( P > .05). Having QT was found to be significantly associated with the PF sulcus angle ( P = .009), and having PT was found to be significantly associated with the femoral Insall angle ( P = .029). Conclusion: Jumper’s knee was found to be associated with anatomic variations of the PF sulcus angle and rotation of the patellar tendon in relation to the femur (femoral Insall angle) on axial MRI scans in professional dancers. Unlike those of other athletes, dancers’ knees are exposed more to external rotation forces because of turnout, and this can be the cause of jumper’s knee.

scholarly journals Morphological study of the vastus medialis oblique in recurrent patellar dislocation based on magnetic resonance images

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Lei Shu ◽  
Xu Yang ◽  
Hangyuan He ◽  
Biao Chen ◽  
Liaobin Chen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Muscle Fibre ◽  
Tilt Angle ◽  
Area Ratio ◽  
Control Group ◽  
Vastus Medialis ◽  
Morphological Parameters ◽  
Sectional Area ◽  
Cross Sectional ◽  
Patella Tilt

Abstract Background To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability. Methods The magnetic resonance imaging data of seventy-five knees (fifty-four patients) with recurrent lateral patella dislocation (LPD) and seventy-five knees (seventy patients) without recurrent LPD were retrospectively analysed. Five morphological parameters related to the VMO (elevation in the sagittal plane and coronal plane, craniocaudal extent, muscle-fibre angulation, cross-sectional area ratio) and two patella tilt parameters (patella tilt angle, bisect offset ratio) were measured in MR images. The independent-samples t test or chi-square test was used for statistical comparisons. Results The mean ages of the patients in the recurrent LPD group and control group were 22.1 ± 9.9 years and 24.0 ± 6.5 years, respectively. Eighteen out of seventy-five (24%) patients MRI showed VMO injuries. Compared with the control group, the patients with recurrent LPD showed significantly higher sagittal VMO elevation (10.4 ± 2.3 mm vs. 4.1 ± 1.9 mm), coronal VMO elevation (15.9 ± 5.7 mm vs. 3.9 ± 3.7 mm), muscle-fibre angulation (35.4 ± 8.0° vs. 27.9 ± 6.3°), patella tilt angle (25.9 ± 10.7° vs. 9.1 ± 5.2°), and bisect offset ratio values (0.9 ± 0.3 vs. 0.5 ± 0.1) and significantly lower craniocaudal extent (13.7 ± 5.3 mm vs. 16.7 ± 5.1 mm) and cross-sectional area ratio values (0.05 ± 0.02 vs. 0.07 ± 0.02). Conclusions The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.

scholarly journals Morphological study of vastus medialis oblique in recurrent patellar dislocation based on magnetic resonance images

2020 ◽  
Author(s):  
Lei Shu ◽  
Xu Yang ◽  
Hangyuan He ◽  
Biao Chen ◽  
Liaobin Chen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Muscle Fiber ◽  
Tilt Angle ◽  
Area Ratio ◽  
Cross Sectional Area ◽  
Vastus Medialis ◽  
Morphological Parameters ◽  
Sectional Area ◽  
Cross Sectional ◽  
Patella Tilt

Abstract Purpose To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability.Methods The magnetic resonance imaging (MRI) data of 75 knees (54 patients) with recurrent lateral patella dislocation (LPD) and 75 knees (70 patients with similar age, gender and body mass index) were retrospectively analyzed. Five morphological parameters related to VMO (elevation on sagittal plane and coronal plane, cross-sectional area ratio, craniocaudal extent, muscle-fiber angulation,) and two parameters of patella tilt (patella tilt angle, bisect offset ratio) were measured in MRI images, and the types of trochlear in each patient were recorded. Finally, the differences of these parameters between the two groups were analyzed.Results Compared with the control group, the patients with recurrent LPD showed significantly higher in sagittal VMO elevation (10.4 ± 2.3 mm vs 4.1 ± 1.9 mm), coronal VMO elevation (15.9 ± 5.7 mm vs 3.9 ± 3.7 mm), muscle-fiber angulation (35.4 ± 8.0° vs 27.9 ± 6.3°), patella tilt angle (25.9 ± 10.7° vs 9.1 ± 5.2°), and bisect offset ratio values (0.9 ± 0.3 vs 0.5 ± 0.1), and significantly lower in craniocaudal extent (13.7 ± 5.3mm vs 16.7 ± 5.1 mm) and cross-sectional area ratio values (0.07 ± 0.02 vs 0.05 ± 0.02).Conclusions The results showed that the abnormality of VMO were clearly present in recurrent LPD patients compared with normal people, which may be an important factor of patella tilt in LPD patients, so it is necessary to focus on injury condition of VMO during preoperative evaluation.

The Effect of Medial Release of the Distal Patellar Tendon Insertion on Lateral Patella Translation and Residual Insertion Strength: A Cadaveric Study

2014 ◽  
Vol 29 (3) ◽  
pp. 525-529
Author(s):  
Geoffrey F. Dervin ◽  
Timothy Whitehead ◽  
Phil Poitras ◽  
Milton Parai ◽  
Hakim Louati
Keyword(s):  
Patellar Tendon ◽  
Cadaveric Study ◽  
Lateral Patella ◽  
Tendon Insertion ◽  
Medial Release

scholarly journals Morphological study of the vastus medialis oblique in recurrent patellar dislocation based on magnetic resonance images

2020 ◽  
Author(s):  
Lei Shu ◽  
Xu Yang ◽  
Hangyuan He ◽  
Biao Chen ◽  
Liaobin Chen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Muscle Fibre ◽  
Tilt Angle ◽  
Area Ratio ◽  
Control Group ◽  
Vastus Medialis ◽  
Morphological Parameters ◽  
Sectional Area ◽  
Cross Sectional ◽  
Patella Tilt

Abstract Background: To investigate the morphological parameters of the vastus medialis obliquus (VMO) muscle and delineate its importance in the maintenance of patellofemoral joint stability. Methods: The magnetic resonance imaging (MRI) data of 75 knees (54 patients) with recurrent lateral patella dislocation (LPD) and 75 knees (70 patients) without recurrent LPD were retrospectively analysed. Five morphological parameters related to the VMO (elevation in the sagittal plane and coronal plane, craniocaudal extent, muscle-fibre angulation, cross-sectional area ratio) and two patella tilt parameters (patella tilt angle, bisect offset ratio) were measured in MRI images. The independent-samples t test or chi-square test was used for statistical comparisons. Results: The mean ages of the patients in the recurrent LPD group and control group were 22.1 ± 9.9 years and 24.0 ± 6.5 years, respectively. MRI demonstrated that 24% (18 of 75) VMO injuries were found in recurrent LPD patients. Compared with the control group, the patients with recurrent LPD showed significantly higher sagittal VMO elevation (10.4 ± 2.3 mm vs 4.1 ± 1.9 mm), coronal VMO elevation (15.9 ± 5.7 mm vs 3.9 ± 3.7 mm), muscle-fibre angulation (35.4 ± 8.0° vs 27.9 ± 6.3°), patella tilt angle (25.9 ± 10.7° vs 9.1 ± 5.2°), and bisect offset ratio values (0.9 ± 0.3 vs 0.5 ± 0.1) and significantly lower craniocaudal extent (13.7 ± 5.3 mm vs 16.7 ± 5.1 mm) and cross-sectional area ratio values (0.05 ± 0.02 vs 0.07 ± 0.02). Conclusions: The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.

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