Clean Run Magazine - November 2007 - 74

Focus on Canine Sports Medicine Rotator Cuff Injury in Performance Dogs By Sherman O. Canapp, Jr., DVM, MS, Diplomate ACVS and Ria Acciani, MPT O © DIANELEWISPHOTOGRAPHY.COM ne of the most common forelimb conditions that presents to VOSM in our canine patients is medial shoulder instability (MSI). This condition may be considered similar to a rotator cuff injury in people. Signs of MSI may be as subtle as performance-related problems (such as refusing tight turns) or be as severe as a weight-bearing lameness. MSI involves multiple components of the shoulder joint and requires a thorough orthopedic evaluation and diagnostic tests to confirm the condition. It is important to identify and treat this condition early to obtain the best long-term results and prevent further shoulder instability and osteoarthritic progression. The recommended diagnostic test for this condition is a shoulder arthroscopy. This minimally invasive procedure allows for complete evaluation of the shoulder joint while performing dynamic testing. Most importantly, if MSI is identified during the evaluation, it can be treated at the same time arthroscopically. If arthroscopic treatment is performed, dogs will be placed in a shoulder protection device (hobbles or sling, depending on the severity) to protect the shoulder as it heals. Dogs are then placed in a rehabilitation therapy program over the next few months. Recovery following MSI treatment ranges from four to five months with dogs returning to competition by approximately six months. Anatomy Anatomically, the canine shoulder joint is the least stable joint, relying on soft tissue structures for stability and function. In dogs the glenohumeral joint (shoulder) has the widest range of motion and is capable of movements in any direction, but its primary movements during ambulation are flexion and extension. The glenohumeral joint relies heavily on capsuloligamentous support to provide stability because its anatomic conformation does not provide a stable socket. The humeral head and glenoid cavity of the scapula make up the ball and socket of the shoulder joint. The glenoid provides little coverage of the humeral head. The joint capsule, ligaments, and surrounding muscles and tendons all contribute to the stability of the shoulder. Insult or injury to any portion of the capsuloligamentous support structures can potentially cause shoulder joint pathology resulting in pain and dysfunction. The components that are most commonly affected by MSI include the joint capsule, medial glenohumeral ligament, subscapularis tendon, supraspinatus tendon, and less commonly, biceps tendon shown in Figures 1 and 2. Depending on the severity and chronicity of the instability, the cartilage may also be affected. Pathogenesis Currently, the exact cause of MSI in dogs is unknown, although it is suspected to be related to chronic repetitive activity, or overuse rather than trauma. Overuse of the shoulder support structures leads to Clean Run | November 07 74

Clean Run Magazine - November 2007

Table of Contents for the Digital Edition of Clean Run Magazine - November 2007

Clean Run Magazine - November 2007
Contents
Editorializing: The Changing of the Guard
Tip of the Month
Everything You Always Wanted to Know About Agility…
Backyard Dogs
In Cider
On Course with Greg Louganis
Help! I Can’t Keep Up: Jo’s Jumping Plan
Spy Kids: The 10-month Mark
Beyond the Backyard
Being Black and White, Part 2: The Weave Poles
Trainer’s Forum
Muscle Memory: Myth or Magic?
World-Class Weaves, Part 2
Power Paws Patterns: Number One
Dash’s Journey: Overcoming Anxiety
Distance Challenge
Will I Qualify?
The Judge’s Debriefing
Rotator Cuff Injury in Performance Dogs
Nested Courses for a Busy World
Addendum to July 2007 Construction Zone
Course Diagram Keys
Clean Run Magazine - November 2007 - Clean Run Magazine - November 2007
Clean Run Magazine - November 2007 - 2
Clean Run Magazine - November 2007 - Contents
Clean Run Magazine - November 2007 - 4
Clean Run Magazine - November 2007 - Editorializing: The Changing of the Guard
Clean Run Magazine - November 2007 - Tip of the Month
Clean Run Magazine - November 2007 - Everything You Always Wanted to Know About Agility…
Clean Run Magazine - November 2007 - 8
Clean Run Magazine - November 2007 - Backyard Dogs
Clean Run Magazine - November 2007 - 10
Clean Run Magazine - November 2007 - 11
Clean Run Magazine - November 2007 - 12
Clean Run Magazine - November 2007 - In Cider
Clean Run Magazine - November 2007 - 14
Clean Run Magazine - November 2007 - 15
Clean Run Magazine - November 2007 - On Course with Greg Louganis
Clean Run Magazine - November 2007 - 17
Clean Run Magazine - November 2007 - 18
Clean Run Magazine - November 2007 - 19
Clean Run Magazine - November 2007 - 20
Clean Run Magazine - November 2007 - Help! I Can’t Keep Up: Jo’s Jumping Plan
Clean Run Magazine - November 2007 - 22
Clean Run Magazine - November 2007 - 23
Clean Run Magazine - November 2007 - 24
Clean Run Magazine - November 2007 - 25
Clean Run Magazine - November 2007 - 26
Clean Run Magazine - November 2007 - Spy Kids: The 10-month Mark
Clean Run Magazine - November 2007 - 28
Clean Run Magazine - November 2007 - 29
Clean Run Magazine - November 2007 - Beyond the Backyard
Clean Run Magazine - November 2007 - 31
Clean Run Magazine - November 2007 - 32
Clean Run Magazine - November 2007 - 33
Clean Run Magazine - November 2007 - 34
Clean Run Magazine - November 2007 - 35
Clean Run Magazine - November 2007 - Being Black and White, Part 2: The Weave Poles
Clean Run Magazine - November 2007 - 37
Clean Run Magazine - November 2007 - Trainer’s Forum
Clean Run Magazine - November 2007 - 39
Clean Run Magazine - November 2007 - 40
Clean Run Magazine - November 2007 - 41
Clean Run Magazine - November 2007 - Muscle Memory: Myth or Magic?
Clean Run Magazine - November 2007 - 43
Clean Run Magazine - November 2007 - 44
Clean Run Magazine - November 2007 - 45
Clean Run Magazine - November 2007 - World-Class Weaves, Part 2
Clean Run Magazine - November 2007 - 47
Clean Run Magazine - November 2007 - 48
Clean Run Magazine - November 2007 - 49
Clean Run Magazine - November 2007 - 50
Clean Run Magazine - November 2007 - 51
Clean Run Magazine - November 2007 - 52
Clean Run Magazine - November 2007 - 53
Clean Run Magazine - November 2007 - 54
Clean Run Magazine - November 2007 - Power Paws Patterns: Number One
Clean Run Magazine - November 2007 - 56
Clean Run Magazine - November 2007 - 57
Clean Run Magazine - November 2007 - 58
Clean Run Magazine - November 2007 - Dash’s Journey: Overcoming Anxiety
Clean Run Magazine - November 2007 - 60
Clean Run Magazine - November 2007 - 61
Clean Run Magazine - November 2007 - 62
Clean Run Magazine - November 2007 - 63
Clean Run Magazine - November 2007 - 64
Clean Run Magazine - November 2007 - Distance Challenge
Clean Run Magazine - November 2007 - 66
Clean Run Magazine - November 2007 - 67
Clean Run Magazine - November 2007 - 68
Clean Run Magazine - November 2007 - Will I Qualify?
Clean Run Magazine - November 2007 - 70
Clean Run Magazine - November 2007 - The Judge’s Debriefing
Clean Run Magazine - November 2007 - 72
Clean Run Magazine - November 2007 - 73
Clean Run Magazine - November 2007 - Rotator Cuff Injury in Performance Dogs
Clean Run Magazine - November 2007 - 75
Clean Run Magazine - November 2007 - 76
Clean Run Magazine - November 2007 - 77
Clean Run Magazine - November 2007 - Nested Courses for a Busy World
Clean Run Magazine - November 2007 - 79
Clean Run Magazine - November 2007 - 80
Clean Run Magazine - November 2007 - 81
Clean Run Magazine - November 2007 - Course Diagram Keys
Clean Run Magazine - November 2007 - 83
Clean Run Magazine - November 2007 - 84
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