Partial Rupture of the Posterior Cruciate Ligament

Clinical History: 
This 29-year-old man presented to his physician with pain in his left knee. He could remember a minor knee injury several weeks ago. In his spare time he goes running three times a week. His past medical history showed no relevant disease.

Diagnosis:
Partial rupture of the posterior cruciate ligament.

MR Technique:
The exam was acquired on a 64-channel whole-body 3 T scanner (Siemens MAGNETOM Skyra) using an 18-element body matrix coil. The MRI protocol included T1 and PD-fs weighted sequences in sagittal orientation. Parameters for the (A) T1-TSE scan were TR/TE 666/13 ms, section thickness 3 mm, FOV 170×170 mm², matrix 410×512, acquisition time 96 sec. Parallel imaging was utilized (GRAPPA), with an acceleration factor of 2. Parameters for the (B) PD-fs-TSE included TR/TE 3430/22 ms, section thickness 1.5 mm, FOV 170×170 mm², matrix 357×384, acquisition time 182 sec. Parallel imaging was utilized (GRAPPA), with an acceleration factor of 2.

Imaging Findings:
The thin PD-fs sequence shows increased signal intensity within the dorsal and caudal aspect of the posterior cruciate ligament. This high resolution image allows clear depiction of continuous fibers of the posterior cruciate ligament. The T1-weighted image demonstrates only a thickened posterior cruciate ligament. In both sequences the continuity of the ligament is preserved. There are no other pathologic findings.