- See:
-
Rupture of the Quadriceps:
-
Patellar Tendon Injury:
-
Tibial Tubercle Frx:
- Discussion:
- extensor mechanism includes quadriceps, quadriceps tendon, medial & lateral
retinaculum, patellofemoral and patellotibial ligaments,
Patellar Tendon
(ligament), and tibial tubercle;
- superficial location of extensor mechanism make it suseptable to injury;
- extensor mechanism rupture may involve either the quadriceps tendon
or patellar ligament and may be either partial or complete;
- complete rupture is rare in young athlete unless assoc w/ steroids;
-
patellar ligament ruptures usually occur in pts < 40 yrs of age
&
quads tendon ruptures in pts older than 40 years of age;
- risk factors:
- RA, long-term diabetes mellitus, and long-term steroid use;
- Diff Dx:
-
Osgood-Schlatter disease,
Sindig-Larsen-Johanssen dz
- consider anatomic malalignment:
Chondromalacia
- MVA (dashboard injury);
- patellofemoral arthritis in those over 40 yrs;
- disproportionate extensor mechanism pain: following trauma or surgery
consider
sympathetic dystrophy;
- disproportionate pain, stiffness, skin discoloration, & decreased skin
temperature;
-------------
Evaluation of the Medial Soft-Tissue Restraints of the Extensor
Mechanism of the Knee.
The effect of external load on torque production by knee extensors.
Evaluation of the medial soft-tissue restraints of the extensor mechanism
of the knee.
Biomechanical effects of different surgical procedures on the extensor
mechanism of the patellofemoral joint.
