PMID: 8609109Feb 1, 1996Paper

Stress radiographs of the patellofemoral joint

The Journal of Bone and Joint Surgery. American Volume
Robert A TeitgeT M Matelic

Abstract

Patellar instability is usually diagnosed on the basis of the clinical presentation without radiographic confirmation. In the present report, we describe a new radiographic method to demonstrate patellar instability. Axial radiographs were made of the patellofemoral joint of ninety individuals (180 knees) and were then repeated while a medial or lateral force was applied to the patella. The applied force was kept constant with use of a specially designed instrument. The ninety individuals were divided into four groups on the basis of the clinical findings: normal, lateral instability, medial instability, and multidirectional instability. Stress radiographs differentiated the four groups and confirmed the clinical diagnosis in all patients who had unilateral symptoms. A four-millimeter increase in medial or lateral excursion of the patella excursion of the asymptomatic knee was significant (p < 0.0001). Stress radiographs offer a simple method for the measurement of force-displacement relationships in the patellofemoral joint and for the demonstration of patellofemoral instability.

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Citations

Jun 22, 2005·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Masataka DeieMasanori Yasumoto
Mar 9, 2006·Clinical Orthopaedics and Related Research·Roger Torga Spak, Robert A Teitge
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