Chondromalacia induced by patellar subluxation in the rabbit

Møller, Bjarne Nue; Møller-Larsen, F; Frich, Lars Henrik

doi:10.3109/17453678909149251

Cited by 47 publications

(23 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…J Orthop Sports Phys Ther 2003;33:677-685. Key Words: magnetic resonance imaging, patellar tracking, patellofemoral joint E xcessive lateral tracking of the patella has been hypothesized to be contributory to the development of patellofemoral pain (PFP). [3][4][5]8,9 Clinical assessment of lateral patellar tracking, however, is a difficult and imprecise task, owing to the inability to directly visualize the relation-ship between the patella and the trochlear groove. In lieu of this limitation, various forms of imaging (ie, radiographs, computerized tomography, magnetic resonance imaging [MRI], and video fluoroscopy) have been employed to make the diagnosis of patellar malalignment or lateral patellar subluxation.…”

Section: Discussionmentioning

confidence: 99%

Patellofemoral Kinematics During Weight-Bearing and Non-Weight-Bearing Knee Extension in Persons With Lateral Subluxation of the Patella: A Preliminary Study

Powers¹,

Ward²,

Fredericson³

et al. 2003

J Orthop Sports Phys Ther

299

260

View full text Add to dashboard Cite

Study Design: Single-group, repeated-measures design. Objective: To compare patellofemoral joint kinematics during weight-bearing and non-weightbearing knee extension in persons with lateral subluxation of the patella. Background: The only previous study to quantify differences in patellofemoral joint kinematics during weight-bearing and non-weight-bearing tasks was limited in that static loading conditions were utilized. Differences in patellofemoral joint kinematics between weight-bearing and non-weight-bearing conditions have not been quantified during dynamic movement. Methods and Measures: Six females with a diagnosis of patellofemoral pain and lateral subluxation of the patella participated. Using kinematic magnetic resonance imaging, axial images of the patellofemoral joint were obtained as subjects extended their knees from 45° to 0° during non-weight-bearing (5% body weight resistance) and weight-bearing (unilateral squat) conditions. Measurements of patellofemoral joint relationships (medial/lateral patellar displacement and patellar tilt), as well as femur and patella rotations relative to an external reference system (ie, the image field of view), were obtained at 3°increments during knee extension. Results: During non-weight-bearing knee extension, lateral patellar displacement was more pronounced than during the weight-bearing condition between 30°and 12°of knee extension, with statistical significance being reached at 27°, 24°, and 21°. No differences in lateral patellar tilt were observed between conditions (P = .065). During the weight-bearing condition, internal femoral rotation was significantly greater than during the non-weight-bearing condition as the knee extended from 18°to 0°. During the non-weight-bearing condition, the amount of lateral Dr. Powers, 1540 E. Alcazar St. CHP-155, Los Angeles, CA 90089-9006. E-mail: powers@usc.edu. patellar rotation was significantly greater than during the weight-bearing condition throughout the range of motion tested. Conclusions:The results of this study demonstrated that lateral patellar displacement was more pronounced during non-weight-bearing knee extension compared to weight-bearing knee extension in persons with lateral patellar subluxation. In addition, the results of this investigation suggest that the patellofemoral joint kinematics during non-weight-bearing could be characterized as the patella rotating on the femur, while the patellofemoral joint kinematics during the weight-bearing condition could be characterized as the femur rotating underneath the patella. J Orthop Sports Phys Ther 2003;33:677-685.

show abstract

Section: Discussionmentioning

confidence: 99%

Patellofemoral Kinematics During Weight-Bearing and Non-Weight-Bearing Knee Extension in Persons With Lateral Subluxation of the Patella: A Preliminary Study

Powers¹,

Ward²,

Fredericson³

et al. 2003

J Orthop Sports Phys Ther

299

260

View full text Add to dashboard Cite

show abstract

“…2,8,15,24,47 A commonly accepted hypothesis concerning the etiology of PFP is related to increased patellofemoral joint stress and subsequent articular cartilage wear. 10,16,17,28,40 Patellar malalignment and/or abnormal patellar tracking is thought to be one of the primary precursors of patellofemoral joint pathology. 11,13,28,40 Acceptance of this theory is evident in clinical practice, as most interventions are focused on the patellofemoral joint itself, with the intention of influencing patellar motion (ie, strengthening the vastus medialis oblique, stretching, patellar taping, patellar bracing, soft tissue mobilization, and patellar mobilization).…”

mentioning

confidence: 99%

The Influence of Altered Lower-Extremity Kinematics on Patellofemoral Joint Dysfunction: A Theoretical Perspective

Powers

2003

J Orthop Sports Phys Ther

791

588

View full text Add to dashboard Cite

Although patellofemoral pain (PFP) is recognized as being one of the most common disorders of the lower extremity, treatment guidelines and underlying rationales remain vague and controversial. The premise behind most treatment approaches is that PFP is the result of abnormal patellar tracking and/or patellar malalignment. Given as such, interventions typically focus on the joint itself and have traditionally included strengthening the vastus medialis oblique, taping, bracing, soft tissue mobilization, and patellar mobilization. More recently, it has been recognized that the patellofemoral joint and, therefore, PFP may be influenced by the interaction of the segments and joints of the lower extremity. In particular, abnormal motion of the tibia and femur in the transverse and frontal planes may have an effect on patellofemoral joint mechanics. With this in mind, interventions aimed at controlling hip and pelvic motion (proximal stability) and ankle/foot motion (distal stability) may be warranted and should be considered when treating persons with patellofemoral joint dysfunction. The purpose of this paper is to provide a biomechanical overview of how altered lower-extremity mechanics may influence the patellofemoral joint. By addressing these factors, better long-term treatment success and prevention may be achieved. J Orthop Sports Phys Ther 2003;33:639-646. Key Words: knee, patella, patellofemoral, pain A lthough patellofemoral pain (PFP) is a common clinical finding in a wide range of individuals, 1,12,39 the incidence is greater in physically active populations. 3,5,19,38 Despite its high prevalence, however, treatment guidelines and underlying rationales remain vague and controversial. 35 This is supported by the fact that there is no agreement on how PFP should be treated. For example, a myriad of conservative procedures have been advocated, 7,26,35,42,46,48,49 and numerous surgical techniques described. 2,8,15,24,47 A commonly accepted hypothesis concerning the etiology of PFP is related to increased patellofemoral joint stress and subsequent articular cartilage wear. 10,16,17,28,40 Patellar malalignment and/or abnormal patellar tracking is thought to be one of the primary precursors of patellofemoral joint pathology. 11,13,28,40 Acceptance of this theory is evident in clinical practice, as most interventions are focused on the patellofemoral joint itself, with the intention of influencing patellar motion (ie, strengthening the vastus medialis oblique, stretching, patellar taping, patellar bracing, soft tissue mobilization, and patellar mobilization).

show abstract

“…68,74,96,136,148 The supposition that excessive patellofemoral joint stress plays a role in the genesis of patellofemoral joint disease is supported by animal studies that have provided histological evidence for surgically induced patella malalignment resulting in cartilage degeneration. 136,161 In addition, patella malalignment has been associated with manifestations of patellofemoral OA and higher rates of disease progression in large observational cohort studies.…”

Section: Patella Malalignment and Tracking Issuesmentioning

confidence: 77%

A Biomechanical Perspective on Physical Therapy Management of Knee Osteoarthritis

Farrokhi¹,

Voycheck²,

Tashman³

et al. 2013

J Orthop Sports Phys Ther

View full text Add to dashboard Cite

Chondromalacia induced by patellar subluxation in the rabbit

Cited by 47 publications

References 15 publications

Patellofemoral Kinematics During Weight-Bearing and Non-Weight-Bearing Knee Extension in Persons With Lateral Subluxation of the Patella: A Preliminary Study

Patellofemoral Kinematics During Weight-Bearing and Non-Weight-Bearing Knee Extension in Persons With Lateral Subluxation of the Patella: A Preliminary Study

The Influence of Altered Lower-Extremity Kinematics on Patellofemoral Joint Dysfunction: A Theoretical Perspective

A Biomechanical Perspective on Physical Therapy Management of Knee Osteoarthritis

Contact Info

Product

Resources

About