IP & DIP Joint Replacement Flashcards Preview

AY BMSc Upper Limb Replacement > IP & DIP Joint Replacement > Flashcards

Flashcards in IP & DIP Joint Replacement Deck (12)
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1

What is the main indication for replacement of the IP joint?

Pain and deformity associated with RA, degenerative arthritis and post-traumatic arthritis

2

Why is implant arthroplasty of the DIPs rarely indicated?

DIPs contribute far less to the overall finger motion

3

What is the best treatment for DIP pathology?

Arthrodesis

4

What are the two types of IP joint replacement?

Flexible hinge
Total interphalangeal

5

How does joint replacement in IP joints compare to that in MCP joints?

Actual prostheses are similar but IP ones have smaller dimensions
Total IP replacement has been associated with similar problems as total MCP replacement (implant fracture, migration, loosening)

6

What type of joint are the PIPs and DIPs?

Biocondyloid (proximal condyle + distal cavity)

7

What contributes to stability in the IP joints?

Bony articulation
Joint capsule
Collateral ligaments
Fibcocartilaginous palmar plate
Muscle tendons

8

What is the major plane of motion of the IP joints?

Flexion-extension (although a small amount)

9

What is the ROM in the PIP joint?

110 degrees flexion

10

What is the ROM in the DIP joint?

90 degrees flexion

11

Why is the preservation of the PIP joint more important than the DIP?

As it contributes more to the overall IP motion (PIP = 85%, DIP = 15%)

12

What have been the clinical results with flexible hinge PIP replacements?

Generally satisfactory (complete pain relief in as many as 90% of patients)
ROM of 40-60 degrees
Infections rare (<0.5%)
Fracture rates low (5%)