Study Guide: Musculoskeletal Examination for Lameness in the Horse

What are the key goals of performing a musculoskeletal exam for lameness in the horse?

The key goals of musculoskeletal exam for lameness in the horse is to identify the problem causing the lameness in order to determine how to correctly treat it.

What initial information should be gathered from the history prior to examining a lame horse?

Initial info that should be gathered from the history prior to examining a lame horse includes: Signalment, specific info about use and type of activity, current lameness, management practices, any additional info

Why is it important to know the horse's discipline or performance use when evaluating lameness?

It is important to know the horses discipline or performance use when evaluating lameness because different sports put different stress on different areas of the body. This can help the vet determine the exact source of the pain.

What are the most common owner complaints that indicate a lameness exam is needed?

The most common owner complaints that indicate a lameness exam is needed include: Head nodding at trot, uneven stride length, stiffness, poor performance under saddle, obvious drop or hike of hip

What aspects of a horse's signalment are most relevant to a lameness exam?

The aspects of a horse's signalment most relevant to a lameness exam include: age, sex, breed, use

Why is it critical to inquire about duration and progression of lameness?

It is critical to inquire about duration and progression of lameness to separate acute from chronic injuries.

What questions should you ask regarding previous treatments and their outcomes?

How have you treated the horse and has the lameness gotten better or worse?

How can shoeing history contribute to understanding a lameness issue?

Shoeing history contributes to understanding a lameness exam because it will help depict past hoof balance changes, old injuries, and how a horse responded to different trims or therapeutic shoes over time

What abnormalities might be seen during a static conformation evaluation?

Abnormalities seen during a static conformation evaluation may include asymmetry or poor conformation

How does hoof balance contribute to lameness evaluation?

Hoof balance analysis identifies uneven weight distribution and structural misalignments in the foot, serving as a primary diagnostic indicator. Poor balance alters joint loading, strains soft tissues, and frequently triggers or mimics lower limb lameness (thank you google)

Why is it important to assess symmetry in muscle development?

It is important to assess symmetry in muscle development to prevent injuries, optimize athletic performance, correct biomechanical imbalances, and track rehab processes.

What are common findings on palpation that may indicate lameness?

Common findings on palpation that may indicate lameness include: localized heat, soft tissue swelling, joint effusion, muscle atrophy/ asymmetry, reactive pain responses, or withdrawal to pressure.

What is the significance of digital pulses and hoof tester response?

The significance of hoof testers is to detect areas of soreness or pain.

The significance of digital pulses is to determine if they are bounding signaling to hoof inflammation or vascular restriction.

How do you distinguish joint effusion from soft tissue swelling?

Joint effusion will follow the exact shape of the joint space and fill the natural pockets of the joint capsule. It may feel tight or firm. Soft tissue swelling is more localized to the site of the injury and will feel spongy or firm, sometimes has pitting edema.

What are the different gaits used for lameness examination and why?

The different gaits used for a lameness exam are typically the walk and trot. A walk is a four beat gait. A trot is a two beat gait and is considered symmetrical which makes it preferred for a lameness exam.

How is lameness graded using the AAEP scale?

Lameness is graded on a scale of 1 to 5 on the AAEP scale.

Grade 1: hard to see at trot and inconsistent

Grade 2: hard to see at trot but consistent

Grade 3: consistently lame at a trot

Grade 4: lameness is obvious at a walk

Grade 5: animal is minimally weight bearing, may even be unable to move

What is the purpose of watching the horse in a straight line and in circles?

The purpose of watching the horse is a straight line and in circles is that in a straight line you see forward movement and symmetry whereas in in a circle the horse leans in and puts more weight on the inside limbs.

Why is it important to observe the horse on hard and soft ground?

Hard ground shows bone and joint issues more clearly and makes the foot land harder. Soft ground will show tendon and ligament problems and forces the pastern to sink lower, thus stretching the DDFT and suspensory ligaments.

How do you evaluate for subtle lameness using flexion tests?

Each area is flexed for about 30 seconds and then the horse trots off in response to the flexion test.

What are the most commonly used flexion tests in the forelimb and hindlimb?

The most commonly used flexion test in the forelimb and the hindlimb are the lower limb, carpus, spavin, and stifle.

What areas of the foot should be tested with hoof testers?

The areas of the foot that should be tested with hoof testers include the sole, across the frog, and the heels.

How do you interpret a positive response to hoof tester application?

A positive response to the heels/ central frog may be caused by navicular syndrome. Positive sole may be an abscess and a positive toe may be laminitis.

What is the purpose of distal limb palpation and manipulation?

The purpose of distal limb palpation and manipulation is to assess the lower legs, joints, and hooves, to help locate the source of pain, evaluation joint range of motion, and diagnose lameness or injury.

What structures are commonly assessed through passive range of motion?

The structures commonly assessed through passive range of motion include joint capsules, ligaments, bursae, cartilage, fascia, and the non-contractile parts of muscles and tendons

What are common compensatory movements seen with forelimb vs. hindlimb lameness?

A compensatory movement seen with forelimb lameness is lameness in compensatory diagonal hindlimb.

A compensatory movement seen with hindlimb lameness is a head nod making the horse appear lame on the ipsilateral forelimb.

What visual clues help localize lameness to a specific limb?

Visual clues that help localize lameness to a specific limb include a head nod, stride length, symmetry, landing, hip hike.

What is the "head nod" and what does it indicate?

A head nod occurs when the lame forelimb hits the ground

What is the typical response of a horse with hindlimb lameness during movement?

A typical response of a horse with hindlimb lameness will be a pelvis hike on the side of the lame leg hitting the ground. The pelvis will have more vertical action when the lame leg hits the ground and more downward action when the sound leg hits the ground. In addition the horse may shift away from the lame leg.

What should be documented following the musculoskeletal exam?

Following a musculoskeletal exam, documentation should record inspection findings, palpation results, range of motion, muscle strength, stability, and any specialized test outcomes

How do findings from the physical and motion exam guide further diagnostics?

Findings from physical and motion exams guide further diagnostics by identifying specific pain patterns, joint instability, or muscle weakness that may help a doctor determine if the next step is radiographs, MRI, or blocking.

Why might diagnostic anesthesia or imaging be indicated following this exam?

Diagnostic anesthesia and imaging are used after a lameness exam to pinpoint the exact site of pain, confirm the physical cause of the problem, and create a targeted treatment plan for the animal.