How best to support collapsed heels? –

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Presentation transcript:

How best to support collapsed heels? – The effect of farriery intervention on hoof deformation and tendon strain Prj:SPrj010

How best to support collapsed heels? SPrj010 Dr. Renate Weller, Dr. Thilo Pfau, Peter Day, Dr. Chris Pardoe Collaborators: Carl Bettison, Haydn Price and Simon Curtis The Royal Veterinary College

Reasons why the study was performed Collapsed (underrun) heels are a common problem in the racing Thoroughbred Collapsed heels are associated with an increased risk of musculoskeletal injury Shoeing horses with collapsed heels is a challenge Scientific evidence on how to treat or or prevent heel collapse is scarce.

Relevance to the thoroughbred Racing Thoroughbreds operate very close to their safety limits Collapsed heels change biomechanics They change the way the hoof deforms and hence shock absorption and load distribution in the limb Optimising shock absorption and load distribution is a must to decrease the risk of musculoskeletal injury

Aims and objectives The aim of this study was to determine the effect of different shoeing techniques on shock absorption and internal load distribution The objectives were to assess how different shoes affect the way the hoof deforms under load the load the different tendons experience under load

What was done? 24 Thoroughbred front legs from 24 horses 12 with obvious and12 without collapsed heels were loaded in a material testing machine Tendon strain was assessed with infrared cameras Leg force with a force plate Hoof deformation with a cine-xray technique 6 legs were also tested in a CT scanner The following 5 conditions were tested on each leg: Glue on plastic heart bar shoe Aluminium racing plate with/without packer Unshod with/without hoof support patches

Measurement of tendon strain with a multi-camera infrared camera set-up

Significant changes in tendon strain   SDFT ALDDFT DDFT SL Glue on heart bar Increased No significant change Decreased Aluminium Racing Plate Aluminium Racing Plate with packing material

Cine-radiography used to assess effect of shoes on hoof kinematics

3D foot deformation with CT based models

Summary Farriery intervention significantly affected hoof deformation and tendon strain: Aluminium race plates with packer resulted in a decreased hoof deformation and an increased strain in the check and suspensory ligament Aluminium racing plates without packing material increased check ligament and superficial flexor tendon strain Glue-on shoes resulted in increased hoof deformation. There was a high degree of variation between horses!

Impact on the thoroughbred Shoeing significantly influences hoof deformation and hence shock absorption and tendon strain in horses with collapsed heels and this should be taken into consideration when shoeing horses with this condition. Variation observed between horses makes it essential that shoeing is carefully tailored to the individual horse

Potential next steps This study will form the basis for further in vivo clinical trials where the most effective in vitro method will be tested in live horses for correction or even better prevention of collapsed heels while optimising internal load distribution and hoof deformation.