Great video:-)!When you measure the depth of the trochlear groove, do you measure to the bone or the cartilage?
@DrChristophAgten4 жыл бұрын
In the original paper by Pfirrmann they measured the bony contours, but different from what I have shown in the video. They measured hight of the lateral and medial facets together, divided by and then subtracted the height of the trochlear groove. This was done 3 cm above joint line Why 3 cm? You have to m measure somewhere 😂. The depth is different when measuring cartilage or bone. Cartilage in the centre of the trochlea is thicker and aggravates any dysplasias as shown here online.boneandjoint.org.uk/doi/full/10.1302/0301-620X.88B5.16866 So it is not really evidence based to measure to the cartilage, but probably clinically more relevant. But I use it only if not sure from eyeballing. 3 cm above joint is random anyways as it does not take patient size into consideration. So take it with a little bit of salt 😂🙈
@DrChristophAgten4 жыл бұрын
radsource.us/trochlear-dysplasia/ Very good discussion about measurements, so the way I measure is the Charlie method.
@SheikisspearАй бұрын
Increase in cut off value means ? Like if thenormal ratio for IS is 1.2. We should add 0.09 to 0.13 to that ratio if done through mri?
@dr.halaalzayat1651 Жыл бұрын
Excellent as usual Dr Agten You make difficult topics easy Thank you
@prashantrdgmc3 жыл бұрын
Thanks a ton doctor! Which is the most accepted and sensitive & specific measurement to determine PFI?
@DrChristophAgten3 жыл бұрын
can't tell you, really, I guess there are also regional differences and different "schools" etc
@DrrGCH3 жыл бұрын
Caton-Deschamps for patella alta for ortho surgeons
@samikshyasingh23853 жыл бұрын
My both the knees suffering from Severe trochlear dysplasia with shallow trochlear groove. Dr. Suggesting for surgery. Is it necessary to go for surgery?
@mohammedarifhossain32932 жыл бұрын
which software you are using here????
@dagourdis2 жыл бұрын
great video! cheers from mexico!
@JSieberer77 Жыл бұрын
Just FYI, the knee in the CT scan for TT-TG is not 100% aligned, causing measurement error (0.8 mm per degree(Yao et al. ?2014?)) so you are likely about 4-5 mm off, hard to say without a coronal slice.
@JSieberer77 Жыл бұрын
Long knee-axis to scanner axis
@Deepikaaniket2 жыл бұрын
what is the Dicom viewer software you are using sir?
@DrChristophAgten2 жыл бұрын
Different ones
@dilipmundhada587510 ай бұрын
I think by mistake initially you said if it is below 3 cm. And it should be 3 mm for shallow groove at 6.32 minutes in video
@svenrachor30184 жыл бұрын
Hallo Christoph, vielen Dank für die tollen Videos! Ich halte die ganzen Indices wie Insall-Salvati und ähnliche für faktisch wertlos, da sie keine Rückschlüsse darüber zulassen, wie groß die artikulierende femoropatellare Kontaktfläche bei Kniestreckung ist. Man könnte diese jedoch mühelos im sagittalen Bild ausmessen. Je kleiner die Kontaktfläche, desto geringer die Führung (wobei bei gestrecktem Knie die Stabilisierung ja hauptsächlich über den medialen Kapsel-Band-Apparat funktioniert). Letztlich hilft es oft mit den Zuweisern zu sprechen und heraus zu finden welche Ausmessungen gewünscht sind.
@DrChristophAgten4 жыл бұрын
Hi Sven. Genau, man kann viel messen wenn der Tag lang ist. Oft halt damit man in Studien irgendwas messen und "Statistik" machen kann
@geniussaiyan3608 Жыл бұрын
Thanks bros😊😊
@РульныйДядька4 жыл бұрын
Thank you
@SharonKirchberg Жыл бұрын
I have Gemodificeerde Insal Salvati ratio: 1.8 what does this mean i have a lot of pain
@陈俊-m4p4 жыл бұрын
which software do you use? how to overlap two CT images together?
@DrChristophAgten4 жыл бұрын
Do you mean for recording?
@陈俊-m4p4 жыл бұрын
@@DrChristophAgten about how to put two CT images in one image
@DrChristophAgten4 жыл бұрын
What do you mean?
@mnoufalmcmc474 жыл бұрын
in most viewers, you can copy or cut the line (graphics) from one slice and paste it wherever you want.
@tugrulokur81089 ай бұрын
which program do you use to measure @@DrChristophAgten
@juonasre Жыл бұрын
Is there any recommendation regarding the ideal degree of knee flexion for measuring the TTTG distance? Since the distance changes in an inversely proportional manner to the degree of knee flexion, this can potentially lead to clinically significant variations in measurement.