title: Negative muscle pennation angle as a sign of massive musculotendinous retraction after tendon tear: paradoxical function of the vastus lateralis muscle.
abstract: In the presented case, an isolated vastus lateralis tendon tear resulted in a negative pennation angle of the distal muscle fibers acting paradoxical to the physiological direction of the proximal muscle fibers. This observation makes the value of an in situ repair of a far retracted tendon tear with interposition of a graft questionable and emphasizes early over late anatomic surgical restoration of the muscle architecture after tendon tears.
authors: Balgrist University Hospital, University of Zürich, Forchstr. 340, 8008 Zürich, Switzerland. dominik.meyer@balgrist.ch
authors: D C
authors: DC
authors: Meyer
authors: C
authors: C
authors: Gerber
authors: M
authors: M
authors: Farshad
mesh_terms: D000328:Adult; D005500:Follow-Up Studies; D006801:Humans; D015601:Injury Severity Score; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D060051:Occupational Injuries / Q000175:diagnosis* / Q000601:surgery; D019637:Orthopedic Procedures / Q000009:adverse effects / Q000379:methods; D010147:Pain Measurement; D010149:Postoperative Pain / Q000503:physiopathology*; D052097:Quadriceps Muscle / Q000293:injuries* / Q000473:pathology / Q000601:surgery; D013180:Sprains and Strains / Q000473:pathology / Q000601:surgery; D013708:Tendon Injuries / Q000175:diagnosis / Q000601:surgery*; D013997:Time Factors; D017211:Treatment Failure; D014942:Workers' Compensation