Hoop Dreams
These collagen fibers, mostly type I, convert axial load into hoop stress.
What are circumferential fibers?
A displaced fragment in the notch can produce a "double PCL" sign on MRI.
What is a bucket-handle tear?
Ridging, flattening, and joint-space narrowing after meniscectomy, first described in 1948.
What are Fairbank changes?
The historical "gold standard" repair, which needs a posterior safety incision.
What is inside-out repair?
A child with a "snapping knee" most likely has this variant.
What is a discoid lateral meniscus?
These paired arteries form the perimeniscal capillary plexus that supplies the peripheral meniscus.
What are the medial and lateral geniculate arteries (superior and inferior)?
Under this MRI criterion, a tear is diagnosed when signal reaches the articular surface on at least 2 images.
What is the two-slice-touch rule?
Meniscal repairs heal at higher rates when done alongside this procedure.
What is ACL reconstruction?
In a lateral inside-out repair, dissecting anterior to the biceps femoris protects this nerve.
What is the common peroneal nerve?
This Watanabe discoid type has no posterior tibial attachment and is held only by a meniscofemoral ligament.
What is the Wrisberg variant?
This meniscus is more mobile and carries about 70% of the load in its compartment.
What is the lateral meniscus?
A "ghost meniscus" on sagittal MRI and extrusion over 3 mm suggest this injury.
What is a meniscal root tear?
In the Finnish FIDELITY trial, APM for degenerative tears was no better than this.
What is sham surgery?
The nerve at risk during a medial inside-out repair.
What is the saphenous nerve?
This procedure reshapes a symptomatic discoid meniscus and leaves a 6-8 mm rim.
What is saucerization?
This meniscofemoral ligament runs posterior to the PCL.
What is the ligament of Wrisberg?
This tear sits at the meniscocapsular junction of the medial posterior horn. It is linked to ACL injury and often missed on MRI.
What is a ramp lesion?
In this 2013 NEJM trial of APM vs. PT for tears with OA, about 30% of PT patients crossed over to surgery.
What is METEOR?
Arnoczky described this autologous blood scaffold for augmenting a repair.
What is a fibrin clot?
These two conditions must be corrected before or along with meniscal allograft transplant.
What are malalignment and ligamentous instability?
Injury to these structures at the popliteal hiatus can cause a hypermobile lateral meniscus.
What are the popliteomeniscal fascicles?
In the LaPrade root classification, this most common type is a complete radial tear within 9 mm of the root attachment.
What is Type 2?
Biomechanically, a complete posterior medial root tear produces contact pressures equal to this.
What is a total meniscectomy?
Releasing this structure percutaneously with a needle improves the view of the medial posterior horn in a tight knee.
What is pie-crusting the MCL?
The lateral meniscal horns attach close together, so lateral MAT usually uses this fixation.
What is a bone bridge (slot/keyhole) technique?