C Heinrichs

Publications (2)5.52 Total impact

• Article: [Comparison of different MRT techniques in the diagnosis of degenerative cartilage diseases. In vitro study of 50 joint specimens of the knee at T1.5].

  G Bachmann, C Heinrichs, I Jürgensen, M Rominger, A Scheiter, W S Rau
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  ABSTRACT: An experimental study was performed on joint specimens of the knee to assess the advantages and disadvantages of 14 generally available sequences in cartilage imaging. Each of the 50 surgically exposed cadaveric joints of the knee was examined by the following sequences: T1, proton- and T2 weighted spin echo(SE) sequences, proton- and T2 weighted Turbo-SE, T1 weighted SE with fat suppression, MTC combined with T1-weighted SE and T2 weighted FLASH-2 D, STIR, FISP-3 D, FLASH-3 D (with fat suppression), and MR arthrography. We assessed the image quality by a scale, signal to noise-ratio of cartilage and joint fluid, and the accuracy in detection of cartilage lesions. Pathology and arthroscopy were reference methods to MRI, and demonstrated grade 1-4 lesions on 186 of 300 joint facettes. Advanced stages of cartilage lesions (65 grade 3 and 4 lesions) were detected by standard SE sequences in 67-94%. Application of volume techniques (FISP-3 D, FLASH-3 D), high definition matrix (512 pixel), MTC with FLASH-2 D and MR-arthrography improved the sensitivity up to 82-100%. Superficial lesions (65 grade 2 lesions) were demonstrated in 3-38%, and on MR arthrography in 45%. Structural changes (56 Grade 1 lesions) were recorded on MR) in only 10%. With regard to standard SE sequences, the detectability of cartilage lesions can be improved by techniques that use 512 matrices, selective cartilage imaging, and volume acquisition.
  RöFo - Fortschritte auf dem Gebiet der R 06/1997; 166(5):429-36. · 2.76 Impact Factor
• Article: [MRT of the knee in the follow-up of the plastic repair of the anterior cruciate ligament with autologous semitendinosus tendon].

  G Bachmann, J Cassens, C Heinrichs, H Saltenberger, T Bauer, K Rauber
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  ABSTRACT: In a prospective study, 153 MRI examinations were performed on 74 patients following reconstruction of a ruptured anterior cruciate ligament with a semitendinosus graft. MRI examinations were performed at three defined intervals (3 months, 4 to 12 months, and 1 to 2 years postoperatively), and the findings were compared to simultaneous clinical tests to define stability criteria. This permitted reliable assessment of the integrity of the ligament graft; in three cases we correctly diagnosed a ruptured graft. A well-defined tendon graft with recognizable fibrous structures correlated with a clinically stable ligament in 98% of the cases. Due to physiological transformation occurring from three months to one year postoperatively, that graft temporarily appears less distinct. Complete integration of the graft with full stability of the knee is visualized in the MRI scan as a tendon with low signal intensity. Postoperative complications and the desire to participate in sports activities are indications for MRI examination.
  RöFo - Fortschritte auf dem Gebiet der R 12/1994; 161(5):446-52. · 2.76 Impact Factor