Clinical Trial Details
— Status: Completed
Administrative data
| NCT number |
NCT04958915 |
| Other study ID # |
M2018014 |
| Secondary ID |
|
| Status |
Completed |
| Phase |
|
| First received |
|
| Last updated |
|
| Start date |
March 1, 2018 |
| Est. completion date |
January 31, 2019 |
Study information
| Verified date |
March 2018 |
| Source |
Peking University Third Hospital |
| Contact |
n/a |
| Is FDA regulated |
No |
| Health authority |
|
| Study type |
Observational
|
Clinical Trial Summary
1. To compare the knee joint MRI 30 ° The flexion position was similar to that of
conventional knee joint coil (about 17 °） The advantages and disadvantages in the description
and diagnosis of anterior cruciate ligament injury;,2. To compare the knee joint MRI 30 ° The
flexion position was similar to that of conventional knee joint coil (about 17 °） Advantages
and disadvantages in description and diagnosis of patellofemoral instability
Description:
Magnetic resonance imaging is widely used in the imaging diagnosis of knee joint injury. At
present, there are two kinds of scanning coils used in our country. One is flexible surface
coil, and the patient is 0 ° Scan in the straight position. The other is the special coil for
the knee joint. At this time, because the coil itself is hard material and has a certain
height, the patient is actually in the knee joint micro bending position (about 17 ° 1) Scan.
However, it may not be accurate enough to evaluate ACL injury and patellofemoral instability
with knee scan in extension and micro flexion position.,1、 Previous literatures have shown
that flexion position is superior to extension position in the description and diagnosis of
anterior cruciate ligament injury. The main reasons include: ① in extension position, the
femoral attachment is wider and flat, with the increase of flexion angle, the anterior
cruciate ligament fiber bundle is twisted, and the femoral segment is narrower in sagittal
position, Thus, it can be clearly shown as a cylindrical bundle structure 2; ② The normal ACL
was tensioned in the extension position, so the femoral attachment area was not well
displayed. With the increase of flexion angle, the femoral segment separated from the
intercondylar crest area, and the volume of intercondylar fossa increased; ③ Due to the
influence of partial volume artifacts in the extension position, the normal anterior cruciate
ligament may also show uneven MRI signal, which is similar to injury, resulting in false
positive, while the flexion position can reduce partial volume artifacts. However, there are
few studies on the advantages and disadvantages of flexion and micro flexion scanning in the
description and diagnosis of anterior cruciate ligament injury at home and abroad.,2、 The
medical research of patellofemoral instability found that in the early stage of knee flexion,
the patella of normal people began to move to the medial side of the knee while sliding from
the starting position to the distal side ° The patella moved inward gradually to the maximum,
then turned to the lateral and moved to the knee flexion of 40 ° The patella returned to the
median line 4. The patients with patellofemoral instability were 15 °- forty-five ° The
center of patella moved from the initial position to the lateral position continuously for 5,
so 30 ° The difference between normal people and patients may be more significant.,The
purpose of this study is to explore 30 cases ° Application value of flexion position in
diagnosis of anterior cruciate ligament injury and patellofemoral instability.
2.Image analysis：Comparison of the diagnosis of anterior cruciate ligament injury between
conventional scan position and 30°flexion scan
(1) Two radiologists respectively evaluated the injury of the anterior cruciate ligament.
The evaluation criteria for the full length display status are as follows: 3 points: The
anterior cruciate ligament is continuously displayed on multiple levels or the full length is
displayed in one level, without obvious artifacts; 2 points: The full length of the anterior
cruciate ligament cannot be displayed completely but the section can be displayed, there are
artifacts but it does not affect the observation; (1)point: The full length of the anterior
cruciate ligament cannot be identified or artifacts affect the observation. The evaluation
criteria for the display status of the tearing point and stump are as follows: (3) points:
The tear point and stump of the ACL are clearly displayed (2) points: One of the torn points
or stumps of the ACL can be clearly displayed, and the other cannot be clearly displayed (1)
point: The tear point and stump of the ACL cannot be clearly displayed
