well here is a stab at some "common" cases in those fields you listed. Keep in mind all of the specialties have their "bread and butter" and their "painful" cases (like diabetic foot, back pain, infected total joints, chronic dislocators, rheumatoid hands, mangled extremities and blitzed pelvises, etc) I think you should take the "good" and the "bad/complex" cases if you are a specialist of have your own niche within your group.
Sports - ACL's, meniscus work, shoulder scopes (cuff, SLAP, instability)
TJA - stringhtforward primary hips and knees
Spine - lami's, discs, short fusions
Hand - CTR, ganglion, trigger finger, arthroplasty (mcp/basilar joint)
Foot and Ankle - Toe deformity (bunion, hammer toe, etc), hind foot problems
Trauma - hip fractures, straightforward diaphyseal fx's
Peds - clubfeet, DDH, perthes, scoli, SCFE,
These are just a small sampling of the top of my head
Good Luck
