31F professional dancer, collided with another dancer weeks ago. Persistent volar pain when making a fist.

Red arrow: retracted RCL tear. Yellow arrow: extensor mechanism injury

Red arrow: retracted RCL tear

You can see the thickened retracted torn RCL at the level of the SF MC head

The Radial Sagittal Band (blue arrow) is intact.  Just distal to that the Yellow arrows indicate a tear of the Oblique fibers of the Extensor Mechanism, which originate at the lateral tendon of the deep head of the Interosseous tendon and lumbrical tendon and contribute to PIP extension.

Bright signal localizes to oblique fiber tear of extensor mechanism.  Orthopedist suspected volar plate injury; the volar plate is intact. 

58F suspected Plantar Fibroma but it looks like something more?

Typical looking P Fibroma central and medial cord.  Looks like P Fibroma of the distal lateral cord, which is very unusual---and seems to extend into small subcutanous fibers of the lateral cord (white arrows).  But there is similar nodular thickening and enhancement along the course of the long and short plantar ligament > bifurcate ligament (red arrows).  What is that about?  XRs looks normal except for calcaneal enthesophytes. 

29-year-old man, 4 days post twisting injury

29M 4 days post twisting injury with ACL tear (yellow arrow)

Note acute avulsion Posterior Horn medial meniscal root (red arrow)

Blue arrow indicates torn Popliteofibular ligament

There are Gr I sprains of the LCL complex and Gr I Popliteal myotendinous strain

White Arrow indicate torn Arcuate ligament  with posterolateral pericapsular edema
 Excellent reference by Humberto Rosas