A Modified Test for Patellar Instability

Tanner, Suzanne M.; Garth, William P.; Soileau, Ramona; Lemons, Jack E.

doi:10.1097/00042752-200311000-00001

Cited by 38 publications

(32 citation statements)

References 19 publications

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“…A 20-N force was chosen based on prior published peer work, in which loads were measured when the patella was laterally displaced to either 1 or 1.90 cm, which is also clinically relevant displacement. 12,19,20 Before data collection in our study, pilot work using 2 distinct specimens repeatedly resulted in patellar displacements in a similar range when the patella was loaded at a constant rate between 0.1 and 20 N. This was generally true for all flexion angles and degrees of dissection. In addition, the 20-N load was sufficient to result in a load-displacement curve outside of the toe-in region.…”

Section: Specimen Testingmentioning

confidence: 80%

The Biomechanical Effects of Limited Lateral Retinacular and Capsular Release on Lateral Patellar Translation at Various Flexion Angles in Cadaveric Specimens

Cancienne

Christian

Redondo

et al. 2019

Arthroscopy, Sports Medicine, and Rehabilitation

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Purpose: To determine the biomechanical effect of limited lateral retinacular and capsular release on lateral patellar translation as a function of constant force at various knee flexion angles. Methods: Six pairs of bilateral cadaveric knee specimens (12 knees) were obtained from a tissue bank, dissected, and potted in a perfect lateral position based on fluoroscopy. A direct lateral force was applied to the patella through an eye screw in the midpoint of the lateral patella, and each knee underwent testing in the intact state and after lateral retinacular and capsular release. All knees were tested at 0 , 10 , 20 , 30 , 45 , 60 , and 90 of flexion using a custom-machined jig on a materials testing system with a 20-N lateral force applied to the patella. Patellar displacement was recorded and compared for each specimen. Results: Lateral displacement was significantly greater at all degrees of flexion for the lateral-release specimens than for an intact lateral retinaculum (P < .05). Compared with intact specimens, lateral-release specimens experienced 30% more translation at 0 of flexion and between 6% and 9% more lateral translation at 10 to 90 of flexion. Conclusions: Lateral retinacular and capsular release results in significantly increased lateral patellar translation at all flexion angles compared with intact specimens. This finding suggests that the lateral retinaculum may function as a significant restraint to lateral translation even with intact medial soft-tissue restraints. Clinical Relevance: Arthroscopic and open limited lateral retinacular releases should be performed with extreme caution when treating lateral patellar instability given the lateral retinaculum's apparent role as a secondary restraint.

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Section: Specimen Testingmentioning

confidence: 80%

The Biomechanical Effects of Limited Lateral Retinacular and Capsular Release on Lateral Patellar Translation at Various Flexion Angles in Cadaveric Specimens

Cancienne

Christian

Redondo

et al. 2019

Arthroscopy, Sports Medicine, and Rehabilitation

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“…The MPFL is a thin, retinacular band of varying length (range: 37-70 mm) 1,36,38,41 and width (range: 5-30 mm). 5,16,32,37,41 No previous studies have examined the thickness of the MPFL.…”

Section: Anatomymentioning

confidence: 99%

“…The medial patellofemoral ligament (MPFL), which is the primary passive restraint to pathologic lateral translation of the patella, 5,9,22,28,38 is torn when the patella dislocates. 33 Recently, there has been increased interest in addressing patellar instability through repair or reconstruction of the MPFL.…”

Section: Introductionmentioning

confidence: 99%

Surgical Options for Treating Injuries to the Medial Patellofemoral Ligament

Froelke

Elias²,

Cosgarea³

2010

J Knee Surg

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“…3). 13 Ligamentous testing of the knee joint was deferred on the basis of the patient's knowledgeable report of her condition and her overall anxiety regarding passive movements of her knee.…”

Section: Examinationmentioning

confidence: 99%

Process for Applying the International Classification of Functioning, Disability and Health Model to a Patient With Patellar Dislocation

Helgeson

Smith

2008

Physical Therapy

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The ICF model has been proposed as a framework for developing diagnostic classifications for rehabilitation professionals. The ICF model also should be assessed with regard to whether it provides a useful process for clinical decision making. The ICF model directs practitioners to address patients' problems at the level of the whole person, with modifications made on the basis of health conditions and personal and environmental factors.

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A Modified Test for Patellar Instability

Cited by 38 publications

References 19 publications

The Biomechanical Effects of Limited Lateral Retinacular and Capsular Release on Lateral Patellar Translation at Various Flexion Angles in Cadaveric Specimens

The Biomechanical Effects of Limited Lateral Retinacular and Capsular Release on Lateral Patellar Translation at Various Flexion Angles in Cadaveric Specimens

Surgical Options for Treating Injuries to the Medial Patellofemoral Ligament

Process for Applying the International Classification of Functioning, Disability and Health Model to a Patient With Patellar Dislocation

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