Dr. Jon Hyman

Jon Hyman, MD


  • Kipping pullups, strict pullups, snatches, ring dips, muscle ups, handstand pushups
  • lowering the weights/eccentric loading
  • biceps tendonitis, AC joints
  • labral tears

There are two labra or labrums in the body: the glenoid labrum in the shoulder and the acetabular labrum in the hip (so if you have both shoulders and both hips, you actually have 4 labra). They are both at somewhat high risk in the Sports of Fitness activities which involve a lot of deep squatting and overhead lifting (push press, muscle ups, ring dips, push ups etc).

Shoulder labral tears are not uncommon in football, hockey, rugby, racquet sports and the like. The ball of the shoulder joint, aka the humeral head is loaded into the socket during lifting activity or inverted activity (ie handstand pushups) and a large joint reactive force is placed across the labrum. The labrum is vulnerable in these positions. Proper technique, maintaining ‘active shoulders’ with tension in the shoulder ligaments (capsule) and good co-contraction of the 17 muscles that attach to the shoulder blade, can all contribute to protecting the shoulder labrum during high load activities.

Some injuries to the shoulder girdle can include nerve stretch from hanging from the bar or a bar pulling your shoulders down, e.g. hang power snatch: traction/winging scapula. We will also see strains or tears of the Rotator cuff: infraspinatus / supraspinatus are the most commonly injured muscles. Clavicle fractures (falling off rings) usually occur with a direct blow.

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Our thanks to FlexBuilding: A New Way to Move. A New Way to Live. for providing the anatomical images for this website.

Your Body & Injury


The biceps tendon can tear up by the shoulder (rupture of the long head of the biceps) or tear by the elbow.

Foot and Ankle

Achilles Injuries. Most commonly, CrossFitters will sustain overuse tendinits.


CrossFit and Plyometrics involves a fair amount of squatting and crouching. Wallballs, slam balls, olympic power lifts, eg squat cleans etc, all involve ‘dropping down low’ and getting your hip crease below knee crease.


Knees are more than just the platform that supports our stance, run and squat.


Muscle physiology is a complex science. There are fast twitch, slow twitch muscle fibers and elaborate mechanisms of enhancing strength, power, endurance speed and fatigue resistance of muscle.


There are two labra or labrums in the body. They are both at somewhat high risk in the Sports of Fitness activities which involve a lot of deep squatting and overhead lifting.


The spine is a complex anatomic masterpiece of axial structural support for our body.


Sprains and tendonitis are the most common ailments.

American Academy for Orthopaedic Surgeons American Board of Orthopaedic Surgery American Orthopaedic Society of Sports Medicine International Society for Hip Arthroscopy
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