Prediction of the Medial Meniscal Size Using Radiograph Measurement of the Medial Proximal Surface of the Tibia in Dogs.

Using radiographic measurements to predict meniscus size can enhance presurgical meniscus transplantation planning. Therefore, we aimed to predict the size of the medial meniscus through radiographic measurement of the medial proximal surface of the tibia. Twenty-four pelvic limbs from medium and large breed dog cadavers had radiographs, and measurements were made from the tibial plateau length in mediolateral 90° and 135° stifle positions (TPL ML90 and TPL ML135) and medial tibial condyle width in the craniocaudal position (MTCW CrCd). The menisci were brushed with a positive contrast mixture, and radiographs were repeated at the same positions. The radiographic brushed meniscus was measured for each length position (CMML ML90, CMML ML135) and width position (CMMW CrCd). The anatomic size (the actual meniscus) was measured for the width (AMW) and the length (AML) and was compared with the radiograph after contrast was added to the meniscus. The ratio (%) of the positive contrast meniscus and conventional radiographic measurements in all positions were ML90 = 83.4 ± 6.9%, ML135 = 85.3 ± 8.11%, and CrCd = 97.9 ± 5.1%. Linear regression analysis equations based on the radiographs measurement values predicted (p ≤ .01) the size of the meniscus (CMML ML90 = 9.7+0.433×TPL ML90; CMML ML135 = 11.7+0.371×TPL ML135; and CMMW CrCd = 2.9+0.775×MTCW CrCd). The intraclass correlation coefficient was used to quantify the agreement between AMW and AML with contrasted radiograph measurements [0.89 for CMMW CrCd (p < .01), 0.91 for CMML ML90 (p < .001), and 0.89 for CMML ML135 (p < .001)]. In conclusion, the width and length of the medial meniscus can be predicted based on the radiographic tibial plateau and medial tibial condyles measurements.