session viii fixation devices casts are stress sharing pins, screws, steinman pins and kirschner...

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Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and are stress sharing. Compression screws and plates are stress shielding or bearing. External fixation is stress sharing No metal at fx site: distal and proximal Avoids excessive soft tissue dissection Potential loss of joint motion due to penetration of multiple tissues Applicable to any long bone fx

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Page 1: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Session VIIIFixation Devices

• Casts are stress sharing• Pins, screws, Steinman pins and Kirschner wires

when used alone provide partial immobilization and are stress sharing.

• Compression screws and plates are stress shielding or bearing.

• External fixation is stress sharing– No metal at fx site: distal and proximal– Avoids excessive soft tissue dissection– Potential loss of joint motion due to penetration of multiple

tissues– Applicable to any long bone fx

Page 2: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Casts are stress sharing

Page 3: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Intramedullary rod with locking screws-stress sharing

Page 4: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Tibial nail unlocked (L) and statically locked (R) are stress sharing

Page 5: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

K wires are stress sharing

Page 6: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and
Page 7: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Screws: Note threads and flutes

Cortical Screw: May-depending on type- require tapping of threads into cortex. Small flutes, designed for solid cortical bone. Can be used for fixation of bone to bone or hardware to bone. Will not create compression without over-drilling near cortex.

Cancellous screw: self tapping. Large flutes for gripping softer spongy bone. Usually used for bone to bone fixation. Will create compression. May be used to attach hardware.

Page 8: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and
Page 9: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Cortical Screw

Self-tapping flutes on this example.

Page 10: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Cancellous ScrewNote the larger flutes

Page 11: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Comparision of cancellous and cortical screws.

Page 12: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Fixation plates. Many types available. These are malleable and are hand-bent to fit bone contour. Note oval screw holes. Eccentric placement of screw within hole allows

compression of fracture fragments.

Page 13: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Screws combined with plates are stress bearing.

Page 14: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and
Page 15: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Dynamic Compression Plate

Page 16: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Kirschner Wires and Steinman PinsK-wires are smaller, come in smooth or threaded,

usually in 3 sizes: .035, .045, and .062.Steinman pins are larger.

Page 17: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Steinman Pins Kirschner Wires

• Thicker

• Usually Threaded

• Thinner

• .035• .045• .062• Threaded or plain

Page 18: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Cerclage Wires and Staples

Page 19: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Stainless Steel Monofilament Wire

Page 20: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

SS Wire in Cerclage

Page 21: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

AP View Cerclage

Page 22: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

K-wires used for small bone fixation. The hooked portion protrudes through the skin allowing “easy” removal.

Page 23: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Lateral View, same wrist

Page 24: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Medullary Rod. Here a femoral rod.

Page 25: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Note locked rod fixation to prevent rotation, and “pistoning” of rod.

Page 26: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and
Page 27: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Canulated ScrewK-wire used as guide for larger screw: less bone loss if error occurs and second placement attempt is required.

Page 28: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Canulated Screw: where you really don’t want to lose too much bone while getting the screw just right.

What was the pre-op Dx?

Page 29: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Try this one for practice.

Page 30: Session VIII Fixation Devices Casts are stress sharing Pins, screws, Steinman pins and Kirschner wires when used alone provide partial immobilization and

Practice film #2. Dynamic hip screw