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| Sesamoiditis |  |
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| The sesamoid bones are maintained in position by the suspensory ligament proximally and by a number of sesamoidean ligaments distally. Due to the great stress placed on the fetlock during fast exercise, the insertion of some of these ligaments can tear, which results in sesamoiditis. |
| The clinical signs are similar to, but less severe than, those resulting from sesamoid fracture. Depending on the extent of the damage, there are varying degrees of lameness and swelling. Reduced speed may be the only manifestation of lameness. Pain and heat are evident on palpation and flexion of the fetlock joint. The radiographic features include periosteal new bone proliferation or osteolytic lesions (or both), particularly on the abaxial surface of the affected sesamoid, and radiolucent lines, which look similar to fracture lines except there is no fragment distraction, running obliquely across the bone. These lines are prominent vascular channels. Oblique radiographic views are essential for accurate diagnosis and evaluation. |
| Despite various treatments, the prognosis is guarded or poor. Even after 9-12 mo rest, many horses become lame 6-8 wk after resuming training. The recommended treatment is a 2- to 3-wk course of phenylbutazone. For mild sesamoiditis, ≥6 mo rest is required; for severe cases, 9-12 mo. |
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| See Also |
| Introduction |
| The Lameness Examination |
| Overview |
| Imaging Techniques |
| Overview |
| Anatomic Imaging Techniques |
| Physiologic Imaging Techniques |
| Arthroscopy |
| Regional Analgesia |
| Disorders of the Foot |
| Bone Cyst in Pedal Bone |
| Bruised Sole and Corns |
| Canker |
| Contracted Heels |
| Fracture of Navicular Bone |
| Fracture of Pedal Bone |
| Keratoma |
| Laminitis |
| Navicular Disease |
| Pedal Osteitis |
| Puncture Wounds of the Foot |
| Pyramidal Disease |
| Quittor |
| Sandcrack |
| Scratches |
| Seedy Toe |
| Sheared Heels |
| Sidebone |
| Thrush |
| Disorders of the Fetlock and Pastern |
| Fracture of Phalanges and Proximal Sesamoids |
| Osselets |
| Ringbone |
| Villonodular Synovitis |
| Windgalls |
| Disorders of the Carpus and Metacarpus |
| Overview |
| Bucked Shins |
| Degenerative Subchondral Lesions of the Carpal Bones |
| Desmitis or Sprain of the Inferior Check Ligament |
| Fracture of the Carpal Bones |
| Intra-articular Osteochondral Chip Fragments of the Carpus |
| Carpal Slab Fractures |
| Accessory Carpal Bone Fractures |
| Fractures of the Small Metacarpal and Metatarsal (Splint) Bones |
| Fracture of the Third Metacarpal (Cannon) Bone |
| Hygroma |
| Osteoarthritis (Degenerative Joint Disease) |
| Osteochondrosis |
| Osteochondroma of the Distal Radius (Supracarpal Exostosis) |
| Rupture of the Common Digital Extensor Tendon |
| Splints |
| Subchondral Cysts and Septic Arthritis |
| Suspensory Desmitis |
| Synovial Hernia and Ganglion and Synovial Fistulae |
| Tearing of the Medial Palmar Intercarpal Ligament |
| Tenosynovitis of the Tendon Sheaths Associated with the Carpus |
| Traumatic Synovitis and Capsulitis |
| Disorders of the Shoulder and Elbow |
| Arthritis of the Shoulder Joint |
| Bicipital Bursitis |
| Fractures of the Elbow |
| Fractures of the Shoulder |
| Sweeney |
| Disorders of the Tarsus |
| Overview |
| Bog Spavin |
| Bone Spavin |
| Curb |
| Displacement of Superficial Flexor Tendon from the Point of the Hock |
| Fracture of the TArsus |
| Hindlimb Tendon Ruptures |
| Rupture of the Peroneus Tertius Muscle |
| Stringhalt |
| Thoroughpin |
| Disorders of the Stifle |
| Fracture of the Stifle |
| Gonitis |
| Patellar Luxation |
| Subchondral Bone Cyst |
| Disorders of the Hip |
| Coxitis |
| Dislocation of the Hip |
| Pelvic Fracture |
| Trochanteric Bursitis |
| Disorders of the Back |
| Fractures |
| Muscle and Ligament Strain |
| Ossifying Spondylosis |
| Overriding of the Dorsal Spinous Processes |
| Sacroiliac Injury |
| Developmental Orthopedic Disease |
| Overview |
| Osteochondrosis |
| Physitis |
| Flexion Deformities |
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