Citation, DOI, disclosures and article data
Citation:
Knipe H, Tibial tuberosity to posterior cruciate ligament distance (TT-PCL distance). Reference article, Radiopaedia.org (Accessed on 09 May 2024) https://doi.org/10.53347/rID-177571
Disclosures:
At the time the article was created Henry Knipe had the following disclosures:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
The tibial tuberosity to posterior cruciate ligament (TT-PCL) distance is an alternative measure to the TT-TG distance for determining tibial tuberosity lateralization, which has a role in patellofemoral instability, without the effect of femoral rotation 1.
TT-PCL and TT-TG have similar reliability and sensitivity/specificity, however, TT-TG has greater diagnostic accuracy 5,6.
The TT-PCL distance is measured on axial MRI between the patellar tendon insertion midpoint and the medial border of the posterior cruciate ligament at its tibial insertion, parallel to the dorsal tibia condylar line 2,3.
normal range: 11.9 ± 4.7 mm 2,3
>20-24 mm: patellofemoral instability 3,4
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1. Geraghty L, Humphries D, Fitzpatrick J. Assessment of the Reliability and Validity of Imaging Measurements for Patellofemoral Instability: An Updated Systematic Review. Skeletal Radiol. 2022;51(12):2245-56. doi:10.1007/s00256-022-04110-9 - Pubmed
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2. Seitlinger G, Scheurecker G, Högler R, Labey L, Innocenti B, Hofmann S. Tibial Tubercle–Posterior Cruciate Ligament Distance. Am J Sports Med. 2012;40(5):1119-25. doi:10.1177/0363546512438762 - Pubmed
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3. Brady J, Rosencrans A, Shubin Stein B. Use of TT-PCL Versus TT-TG. Curr Rev Musculoskelet Med. 2018;11(2):261-5. doi:10.1007/s12178-018-9481-4 - Pubmed
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4. Su P, Jian N, Mao B, Zhang Z, Li J, Fu W. Defining the Role of TT-TG and TT-PCL in the Diagnosis of Lateralization of the Tibial Tubercle in Recurrent Patellar Dislocation. BMC Musculoskelet Disord. 2021;22(1):52. doi:10.1186/s12891-020-03900-3 - Pubmed
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5. Vivekanantha P, Kahlon H, Shahabinezhad A et al. Tibial Tubercle to Trochlear Groove Distance Versus Tibial Tubercle to Posterior Cruciate Ligament Distance for Predicting Patellar Instability: A Systematic Review. Knee Surg Sports Traumatol Arthrosc. 2023;31(8):3243-58. doi:10.1007/s00167-023-07358-3 - Pubmed
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6. Zhang L, Tian M, Wu S et al. Tibial Tubercle-Trochlear Groove Distance Has Better Diagnostic Reliability Than Tubercle-Posterior Cruciate Ligament Distance For Predicting Patellar Instability: A Systematic Review. Orthop Surg. 2023;15(9):2225-34. doi:10.1111/os.13819 - Pubmed
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