Updated October 2017
I recently had the opportunity to speak with one of my professors Mark Butler, a physical therapist I have a lot of respect for. I asked him what he thought was the most common shoulder problem in the world of fitness. His response:
From my own experience (in the clinic and when coaching) and speaking with other crossfit trainers and therapists, the most common problem area for people in crossfit is the shoulder. Just take a look at the major exercises in crossfit; overhead press, push press, push jerk, pushups, kipping pullups, snatches, dips, muscle-ups and handstand pushups. All awesome exercises, all tough on the shoulder. No wonder we have impingement.
Note: 5 years later, impingement continues to be the #1 most common issue I treat clinically and see in the gym
Unfortunately, the term shoulder impingement is thrown around quite a bit to describe every type of shoulder pain. In reality there are several different types of impingement, each with unique aspects. This is why its important to consult a professional if you are concerned you may have an impingement situation. The problem can be very complex and impingement can be coupled with other issues as well.
In understanding shoulder impingement first we’ll learn the anatomy.
In this picture we have the shoulder joint. Here are the key structures:
In an impingement scenario, the rotator cuff and scapular musculature is not holding the humeral head firmly into the socket. Commonly the humeral head translates superiorly (goes up) and the contents of the subacromial space gets pinched (impinged) against either the acromion, coracoid or a combination of the two.
This can occur with all different movements of the shoulder. Check out the video below to learn a bit more:
An old professor of mine Dr. Kietrys has an excellent saying about impingement. He says, “All roads lead to shoulder impingement” What he meant by this is that most types of shoulder pain end up causing some type of impingement. So regardless of how you hurt your shoulder (overuse, technical breakdown, overstretch, muscular imbalance, poor posture, dyskinesis) it will most likely end up causing a shoulder impingement. In a lot of cases shoulder pain can lead to a cascade of additional problems (muscle-firing issues, weakness). Now you’ve got a complex rehabilitation situation on your hands or in some cases, surgery.
As discussed earlier, the impingement can be occurring in multiple places:
Impingement by the coracoacromial arch (a fancy term for the acromion, the coracoid and the ligament that connects the two) is what we discussed earlier. It’s also commonly referred to as subacromial impingement. The most important thing to remember about this condition is that the humeral head is not being held tightly into the glenoid fossa (ball into socket) in the correct position during exercise. This happens for a variety of reasons we’ll discuss in the next articles. Because of this we get excessive impingement, pain and eventually damage to the structures within the subacromial space.
In subacromial impingement of the shoulder there is typically a painful arc of motion while raising your arms overhead, usually in the 70-120 degree range.
For this reason a lot of athletes will be able to perform push jerks without much pain but lowering the weight back down under control can be very painful. When the shoulder is being forced to work through the painful arc it may hurt (strict press or lowering a heavy weight from overhead under control). When the force is created by the lower body to get the weight overhead and then “caught” in a fully locked out position there is generally less pain because we’re avoiding loading through this painful arc.
These patients also usually have pain when reaching across the body, internal rotation of the shoulder and elevation of the arm into the painful arc of motion as described earlier. These are a few provocative diagnostic tests to rule in subacromial impingement syndrome. Each of these tests creates compression of the cuff, biceps tendon and bursa and is deemed positive if it recreates the patient’s normal pain.
Coracoid Impingement – This guy looks especially happy to be having shoulder problems
Hawkins Impingement Test
Internal impingement is a different beast. This is an impingement common in throwing athletes and occurs with excessive external rotation of the shoulder seen in pitching and in the tennis and volleyball serve. Although this impingement is specific to overhead throwers, the motion that causes internal impingement is very close to some exercises that require external rotation of the shoulder in an overhead position (Snatch grip push press, behind the neck press).
Note: I tend to see a lot of athletes who present with a lot of posterior shoulder pain (along teres minor / infraspinatus) and are very tender to palpation of these structures. These athletes tend not to tolerate external rotation well, especially combined with horizontal abduction (Think of the motion required in a behind the neck barbell overhead press) My thoughts are that are that the posterior cuff muscles are potentially being impinged and required to work excessively and may become painful for those reasons.
Again, please don’t try and diagnose and treat yourself, consult a professional if you’ve got pain. This isn’t a problem to take lightly. In the next installments we’ll talk about common causes of impingement and how to specifically prevent these issues in the crossfit population.
Just a few things covered in the course…
Here’s to healthy shoulders,
Dan Pope DPT, OCS, CSCS, CF L1
Behnke, R. S. (2006). Kinetic anatomy. (2 ed., pp. 35-56). Champaigne, IL: Human Kinetics.
Page, P., Frank, C. C., & Lardner, R. (2010). Assessment and treatment of muscle imbalances the janda approach. (pp. 195-207). Champaigne, IL: Human Kinetics.
Wilk, K. E., Reinold, M. M., & Andrews, J. R. (2009). The Athlete’s Shoulder . (2 ed.). Philadelphia, PA: Churchhill Livingstone.
Is CrossFit (TM) Causing Shoulder Injuries?
Keys to Fix and Prevent Shoulder Pain
Shoulder Impingement: Part 4 – The Thoracic Spine and Ribcage’s Role in Impingement
Shoulder Impingement: Part 3 – The Shoulder Blade’s Role in Impingement
Shoulder Impingement: Part 2 – What Happens at the Shoulder Joint During Impingement
Anatomy of Shoulder Impingement, Rotator Cuff and Labral Tears
4 Step Checklist for Battle Ready Shoulders
Understanding The Shoulder Pain Epidemic in CrossFit Athletes (Part 4: Programming and Periodization)