Subchondral lucencies of the proximal tibia in 17 horses.
Authors: Santschi Elizabeth M, Whitman Jeremy L, Prichard Michael A, Lopes Marco A F, Pigott John H, Brokken Matthew T, Jenson Paul W, Johnson Christopher R, Morrow Chris, Brusie Robert W, Juzwiak James S, Morehead James P
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Subchondral lucencies of the proximal tibia in 17 horses Subchondral lucencies (SCL) in the proximal tibia represent a significant source of lameness in horses, yet treatment protocols remain poorly defined. This retrospective analysis examined 17 cases over a median follow-up period of 20 months, characterising the condition's presentation, natural history, and response to various interventions including conservative management, surgical debridement, and screw fixation. Lameness occurred in 14 of the 17 horses, with lesions classified as either primary tibial SCL (11 horses) or secondary to ipsilateral medial femoral condyle involvement (six horses). Conservative management through exercise restriction showed promise only in non-lame young horses with small primary lesions—three cases improved radiographically—but failed to resolve lameness in horses with larger or more symptomatic SCL. Screw fixation demonstrated superior outcomes, with complete lameness resolution in three horses with primary SCL and significant improvement in lesion size and clinical signs across five cases of secondary SCL. These findings suggest a lesion-dependent approach to proximal tibial SCL: young, non-lame horses harbouring small primary lucencies warrant conservative management, whilst symptomatic cases—particularly those with established lameness or secondary involvement—benefit from surgical stabilisation via screw fixation. The poor prognosis associated with surgical debridement alone warrants caution with this technique. Given the condition's potential for progression to osteomyelitis, early diagnosis and appropriate case stratification are essential for optimising clinical outcomes.
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Practical Takeaways
- •Small, non-painful subchondral lucencies in young horses may resolve with rest alone, but larger or painful lesions typically require surgical intervention
- •Screw fixation is an effective treatment option for persistent proximal tibial subchondral lucencies causing lameness, improving both radiographic appearance and clinical soundness
- •Conservative management should be attempted first in young horses without lameness; failure to improve within a reasonable timeframe warrants consideration of surgical intervention
Key Findings
- •Proximal tibial subchondral lucencies were associated with lameness in 14 of 17 horses (82%)
- •Non-lame young horses with small primary subchondral lucencies healed with exercise restriction alone, but lame horses with larger lesions did not improve conservatively
- •Screw fixation resulted in lameness resolution in 3 horses with primary tibial subchondral lucencies and reduced lameness in 5 horses with secondary lesions
- •Median follow-up duration was 20 months with range 0-48 months