Biceps femoris tendon and lateral collateral ligament: analysis of insertion pattern using MRI
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Purpose : The biceps femoris tendon (BFT) and lateral collateral ligament (LCL) in the knee were formerly known to form aconjoined tendon at the fibular attachment site. However, the BFT and LCL are attached into the fibular head in variouspatterns. We classified insertion patterns of the BFT and LCL using MR imaging, and analyzed whether the LCL attaches tothe fibular head or not. Materials and Methods: A total of 494 consecutive knee MRIs of 470 patients taken between July 2012 and December2012 were retrospectively reviewed. There were 224 males and 246 females, and patient age varied from 10 to 88(mean, 48.6). The exclusion criteria were previous surgery and poor image quality. Using 3T fat-suppressed proton density-weighted axial images, the fibular insertion patterns of the BFT and LCL were classified into following types: type I (theLCL passes between the anterior arm and direct arm of the BFT’s long head), type II (the LCL joins with anterior arm of thelong head of the BFT), type III (the BFT and LCL join to form a conjoined tendon), type IV (the LCL passes laterally aroundthe anterior margin of the BFT), and type V (the LCL passes posteriorly to the direct arm of the BFT’s long head). Results: Among the 494 cases of the knee MRI, there were 433 (87.65%) type I cases, 21 (4.25%) type II cases, 2 (0.4%)type III cases, 16 (3.23%) type IV cases, and 22 (4.45%) type V cases. There were 26 cases (5.26%) in which the LCL andBFT were not attached into the fibular head. Conclusion: The fibular attachment pattern of the BFT and LCL shows diverse types in MR imaging. The LCL does notadhere to the head in some patients.
Abstract
Purpose : The biceps femoris tendon (BFT) and lateral collateral ligament (LCL) in the knee were formerly known to form aconjoined tendon at the fibular attachment site. However, the BFT and LCL are attached into the fibular head in variouspatterns. We classified insertion patterns of the BFT and LCL using MR imaging, and analyzed whether the LCL attaches tothe fibular head or not. Materials and Methods: A total of 494 consecutive knee MRIs of 470 patients taken between July 2012 and December2012 were retrospectively reviewed. There were 224 males and 246 females, and patient age varied from 10 to 88(mean, 48.6). The exclusion criteria were previous surgery and poor image quality. Using 3T fat-suppressed proton density-weighted axial images, the fibular insertion patterns of the BFT and LCL were classified into following types: type I (theLCL passes between the anterior arm and direct arm of the BFT’s long head), type II (the LCL joins with anterior arm of thelong head of the BFT), type III (the BFT and LCL join to form a conjoined tendon), type IV (the LCL passes laterally aroundthe anterior margin of the BFT), and type V (the LCL passes posteriorly to the direct arm of the BFT’s long head). Results: Among the 494 cases of the knee MRI, there were 433 (87.65%) type I cases, 21 (4.25%) type II cases, 2 (0.4%)type III cases, 16 (3.23%) type IV cases, and 22 (4.45%) type V cases. There were 26 cases (5.26%) in which the LCL andBFT were not attached into the fibular head. Conclusion: The fibular attachment pattern of the BFT and LCL shows diverse types in MR imaging. The LCL does notadhere to the head in some patients.
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