title: Tips of the trade. Detecting patellar surface irregularities.
abstract: A method of determining the presence of patellar surface irregularity, which the author calls the megaphone test, is described. By forming a simple echo chamber with the hand, crepitant sounds created by patellar roughening can be detected. This test, however, does not quantify or determine the cause of the crepitus.
authors.affiliation: Department of Orthopaedics, Temple University, Philadelphia, Pennsylvania.
authors.forename: R P
authors.initials: RP
authors.lastname: Lonergan
mesh_terms: D001847:Bone Diseases / Q000175:diagnosis; D006801:Humans; D010329:Patella; D010808:Physical Examination / Q000379:methods*; D013016:Sound