Bone Spavin, P1, Splint Bone, Proximal Sesamoid Fractures

Question 1

What is bone spavin?

Answer 1

DJD of distal tarsal and TMT joint

Question 2

What term is used to describe the stance of this horse?

Answer 2

sickle-hocked

Question 3

T/F: MRI can be as good as arthroscopy for detecting subchondral lesions

Answer 3

True

Question 4

What are the medical management options for bone spavin?

Answer 4

• Intra-articular injections of corticosteroids and chondroprotectives
• Phenylbutazone
• Exercise

Medical management might be disappointing and lameness may persist in 25-50% of horses

Question 5

How does laser-facilitated ankylosis work?

Answer 5

Destroys cartilage by superheating and vaporizing synovial fluid

Question 6

When drilling for P1 fractures, the most proximal screw must be within ____ of the sagittal groove

Answer 6

5 mm

Question 7

This horse has an incomplete fracture of P1. What is the recommended treatment?

Answer 7

Lag screw or cast only + strict stall rest

Question 8

T/F: Many splint bone fractures can be treated successfully with rest

Answer 8

True

Question 9

T/F: Fetlock arthrodesis is considered a salvage procedure

Answer 9

True

Question 10

Diagnosis?

Answer 10

Fractured splint bone

Question 11

Fracture of the middle aspect of the splint bone:

• Are usually treated via removal of the fractured bone under general anesthesia
• Usually result from external trauma and most commonly affect metacarpal IV and metatarsal IV
• May cause suspensory dermitis
• Often cause swelling of the MT region and do not require a nerve block for definitive diagnosis
• All of the above

Answer 11

All of the above​

Question 12

In cases of splint bone fracture, if you’re removing residual distal splint bone, it is important not to remove more than the distal 2/3 of the splint bone.

What is the exception?

Answer 12

Metatarsal IV

Question 13

T/F: Proliferative periostitis is most common in older horses

Answer 13

False

Proliferative periostitis is most common in young horses

Question 14

T/F: Splint exostosis is the result of straining and tearing of the interosseous ligament connecting the splint bone to the cannon bone

Answer 14

True

Question 15

T/F: Splint bone fractures are caused by hyperextension of the fetlock or external trauma

Answer 15

True

Question 16

__________ ligament connects the splint bone to the cannon bone

Answer 16

interosseous

Ligamentous injury results in desmitis and periostitis

Question 17

T/F: With appropriate treatment the prognosis for returning to racing with bucked shins is good

Answer 17

True

Question 18

This injury on the 3^rd metacarpus is most commonly seen in which patient

• 2-wk old foal that has been running after its dam
• A yearling cold that has been castrated
• 2 yr old race horse in training
• A 8 year old mare QH used for barrel racing
• None of the above

Answer 18

2 yr old race horse in training

(Image is of a bucked shin)

Question 19

How do you reduce the incidence of bucked shins?

Answer 19

regular short distance breezing and less long distance galloping

Question 20

T/F: Osteostixis is recommended for unicortical fractures of the splint bone

Answer 20

False

Osteostixis is recommended for unicortical fractures of the cannon bone ​

Question 21

VI represents a ________ fracture of the proximal sesamoid bones

Answer 21

comminuted

Question 22

III represents a ________ fracture of the proximal sesamoid bones

Answer 22

Base

Question 23

I represents a ________ fracture of the proximal sesamoid bones

Answer 23

Apical

Question 24

V represents a ________ fracture of the proximal sesamoid bones

Answer 24

Sagittal (Axial)

Question 25

\_\_\_\_\_\_\_\_\_\_ are the most common fractures of the proximal sesamoid bones

Answer 25

**Apical fractures**