Nadal Rubens Rosso, Kuhn Vinícius Canello, Teixeira Alexandre Codevilla, Bervian Júnior Eduardo, Lopes Júnior Osmar Valadão
Instituto de Ortopedia e Traumatologia de Passo Fundo, Passo Fundo, RS, Brasil.
Departamento de Ortopedia e Traumatologia, Hospital São Vicente de Paulo, Passo Fundo, RS, Brasil.
Rev Bras Ortop (Sao Paulo). 2025 Jun 23;60(2):1-5. doi: 10.1055/s-0045-1809517. eCollection 2025 Apr.
To evaluate and compare the values of the patellar tendon-trochlear groove (PT-TG) distance in individuals with and without patellar instability. Additionally, we aimed to define a cut-off value for the pathological limit of the PT-TG through nuclear magnetic resonance imaging (MRI) in patients with patellar instability.
The PT-TG distance of 52 knees was measured in 48 individuals with objective patellar instability (instability group) by MRI. These measurements were compared with those made in 50 knees of 44 individuals without a history of patellar instability (control group).
The PT-TG distance in the instability group (20.6 ± 5.0 mm) was greater than in the control group (11.8 ± 3.4 mm; < 0.001). A value of 15.5 mm was determined as the pathological limit, with an accuracy of 81.4%, in MRI exams.
Individuals with patellar instability have statistically higher measurements of PT-TG when compared with patients without it. Therefore, values higher than 15.5 mm for PT-TG seen in MRI exams represent a pathological lateralization force of the extensor mechanism related to patellar instability.
评估和比较有和没有髌骨不稳定的个体中髌腱-滑车沟（PT-TG）距离的值。此外，我们旨在通过核磁共振成像（MRI）确定髌骨不稳定患者PT-TG的病理极限临界值。
通过MRI测量了48例有客观髌骨不稳定的个体（不稳定组）中52个膝关节的PT-TG距离。将这些测量结果与44例无髌骨不稳定病史的个体（对照组）中50个膝关节的测量结果进行比较。
不稳定组的PT-TG距离（20.6±5.0mm）大于对照组（11.8±3.4mm；<0.001）。在MRI检查中，确定15.5mm的值为病理极限，准确率为81.4%。
与没有髌骨不稳定的患者相比，有髌骨不稳定的个体在统计学上PT-TG测量值更高。因此，在MRI检查中PT-TG值高于15.5mm代表与髌骨不稳定相关的伸肌机制的病理性外侧化力量。
