Equine veterinary journal1986; 18(1); 25-28; doi: 10.1111/j.2042-3306.1986.tb03530.x

Diagnostic techniques in the investigation of shoulder lameness.

Dyson, S

Abstract: Methods of investigating horses with suspected shoulder lameness are described and discussed. The gait of shoulder lameness is characterised and compared with that of lower forelimb lameness. If lameness is slight, differentiation may be difficult, but if moderate, upper forelimb lameness usually results in shortening of the cranial phase of the stride and a low limb flight. Clinically, it may not be possible to differentiate between shoulder and elbow lameness without intra-articular anaesthesia. Practical aspects of intra-articular anaesthesia of the shoulder joint are reviewed. Synovial fluid must be retrieved to ensure that the needle is intra-articular. Up to 60 mins may elapse after injection of local anaesthetic before significant improvement occurs. Lameness is often improved rather than eliminated. A technique for standing radiography of the shoulder is described and the limitations of assessing a joint only by lateral projections are highlighted. There may be difficulties in positioning weanling foals and yearlings, resulting in superimposition of the shoulder joint, cervical and thoracic vertebra and ribs. It is concluded that a combination of a thorough clinical examination, faradism, local anaesthesia, synovial fluid analysis and radiography usually enables an accurate diagnosis to be reached.

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Publication Date: 1986-01-01 PubMed ID: 3948826DOI: 10.1111/j.2042-3306.1986.tb03530.xGoogle Scholar: Lookup

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The research article provides methods for examining horses with shoulder lameness and differentiates it from lower forelimb lameness through gait analysis. The paper also includes a discussion on the effects of local anesthesia, synovial fluid analysis, and the technique of standing radiography in diagnosing such conditions.

Investigation of Shoulder Lameness

The paper begins by describing the techniques used for investigating shoulder lameness in horses. Shoulder lameness refers to pain, stiffness, or weakness in a horse’s shoulder, making it difficult for the horse to walk or run normally.
The gait or the manner of moving in horses with shoulder lameness is characterized and compared to that of lower forelimb lameness. The objective is to draw clear distinctions between the two and to better understand the specific effects of shoulder lameness on a horse’s movements.

Role of Local Anesthesia

The article explores the use of intra-articular anesthesia, a method in which an anesthetic is injected directly into the joint space to numb the area. This is often done when it is not clinically possible to differentiate between shoulder and elbow lameness in horses.
The paper also discusses the practical aspects and effects of using intra-articular anesthesia. Specifically, it mentions how up to 60 minutes may pass after the injection before a significant improvement in the horse’s condition is noted.

Synovial Fluid and Radiography

The research also highlights the importance of drawing synovial fluid, the fluid found in joint spaces, to ensure the needle is intra-articular. Through synovial fluid analysis, experts can confirm the presence of inflammation or other pathological conditions, providing a more accurate diagnosis.
The paper describes the technique for standing radiography of the shoulder. This refers to taking X-ray images of the shoulder while the horse is standing, which can help identify any abnormalities in the bone structure.
The limitations of assessing a joint only through lateral projections or side-view X-ray shots are discussed. The paper mentions potential difficulties in positioning young horses for these shots, which may result in overlapping images of the shoulder joint, cervical and thoracic vertebra, and ribs.