The Link of the Hip and Pelvis in Baseball Players
Updated: Sep 3
Kathy Ryan-Ceisel, PT MHS | Algonquin Sports PT
Overhead Throwing Expert-Athletic Edge and Wellness
Think of the pelvis and hips as the chassis and tires of a car. The pelvis provides the foundation, while the hips help control, rotate, and direct the movement of the entire system. If the foundation is unstable or the “tires” cannot move effectively, the rest of the body has to compensate.
For baseball and softball athletes, pelvic control is the foundation of efficient movement and overhead throwing. The pelvis serves as the base of our kinetic chain, connecting the lower body to the trunk and upper extremity. Developing the ability to control the pelvis allows the lower body to rotate independently from the upper body during pitching and hitting.
This separation between the pelvis and trunk is an important component of efficient force production and transfer. Rather than relying primarily on the arm, an athlete should be able to generate force from the ground, transfer it through the legs and pelvis, and then efficiently transmit that energy through the trunk and into the arm or bat.
Hip Mobility Matters
Hip mobility can change throughout a baseball or softball season. Repetitive throwing, hitting, sprinting, lifting, and competition can contribute to changes in hip range of motion, particularly when athletes do not adequately recover.
A loss of hip mobility may contribute to compensatory movement patterns elsewhere in the kinetic chain. For pitchers, this may increase the demands placed on the shoulder and elbow as the body attempts to find another way to produce or dissipate force.
Research has also identified an association between hip and groin problems and upper-extremity injury in professional pitchers. One study found that MLB pitchers who underwent Tommy John surgery experienced a higher frequency of hip and groin injuries before and after surgery compared with controls. This does not mean that a hip injury directly causes an elbow injury. Rather, it highlights the importance of looking at the entire kinetic chain when evaluating an overhead athlete.
Hip Rotation and the Pitching Delivery
Pitchers require adequate hip range of motion and strength to efficiently move through the pitching delivery. The stride leg and drive leg have different demands. The athlete needs the ability to control internal and external rotation of both hips while simultaneously producing and absorbing force. The lead hip, in particular, must be capable of accepting force after foot contact and continuing to rotate as the trunk and throwing arm move toward ball release.
The hips of a pitcher often experience a reduction in internal rotation mobility (moving inward), particularly in the front stride leg. Athletes require sufficient range of motion and strength in the stance hip's internal rotation and the stride hip's external rotation (moving outward) to achieve optimal timing for trunk rotation to align with home plate. Saito et al. discovered that youth baseball players experiencing elbow pain showed a reduction in hip internal rotation. Additionally, pitchers lacking hip strength were unable to effectively stabilize and absorb the force in the lead leg's knee or apply force into the ground with the drive hip. Pitching with an unstable base reduces force production, decreases velocity, and increases stress on the arm.
Research has found an association between decreased hip internal rotation and elbow symptoms in youth baseball players. This supports the importance of evaluating the hips when an athlete presents with throwing-related complaints—not simply examining the painful shoulder or elbow.
What happens when lead-hip internal rotation is limited?
1. Poor force absorption and deceleration
After foot contact, the lead leg must accept and redirect tremendous forces. The athlete needs adequate hip motion and strength to continue rotating over the lead leg.
If the lead hip cannot move effectively, the body may have fewer options for dissipating force. This can increase the demands placed on the trunk, shoulder, and elbow as the throwing arm rapidly decelerates.
Think of it as repeatedly trying to stop a fast-moving arm without allowing the rest of the body to help slow it down.
2. Loss of force transfer
Once the stride foot contacts the ground, energy generated by the lower body needs to transfer through the pelvis and trunk. If the lead hip cannot accept and rotate through the necessary range, the athlete may “leak” energy rather than efficiently transferring it up the kinetic chain.
This can potentially reduce performance and cause the athlete to rely more heavily on the upper body to generate velocity.
3. Altered timing at foot contact
Hip mobility restrictions can also influence how the pelvis and trunk are positioned during the pitching delivery.
An athlete who cannot effectively use the hips may compensate by rotating the pelvis and trunk differently or by opening the upper body earlier. Ideally, the pelvis and trunk do not simply rotate together like a gate. Efficient pitching requires sequencing—the pelvis begins the rotational process, followed by the trunk and then the arm.
When these segments lose their ability to separate and sequence appropriately, the arm may be required to contribute more to the production of velocity.
The Hips are Important for Hitting TOO!
Hip mobility and control are not just pitching concerns. Hitters need the ability to load into the back hip while maintaining control of the pelvis and trunk. They also need the mobility and strength to stabilize the front hip after heel plant and transfer force through the body into the bat. Limited hip rotation can interfere with this process.
A hitter may have difficulty:
Loading effectively into the back hip
Maintaining pelvic control during the swing
Creating separation between the pelvis and trunk
Stabilizing the front side
Rotating through the lead hip
Efficiently transferring force from the lower body to the upper body
When the hips cannot do their job, the athlete may compensate with the trunk or upper extremities—potentially resulting in decreased bat speed, inconsistent mechanics, or unnecessary stress on other areas of the body.
Don't Forget the Side Hip Muscles
Recent research has also emphasized the importance of the hip abductors, commonly thought of as the “side hip” muscles. These muscles play an important role in controlling the pelvis, maintaining single-leg balance, and managing the position of the trunk and lower extremity.
Pitching is essentially a series of high-speed single-leg positions. The athlete must repeatedly control the body while moving from one leg to the other and generating and absorbing large amounts of force. Hip abductor weakness or asymmetry may contribute to excessive movement of the pelvis and lower extremity during dynamic single-leg activities.
One study of professional baseball players found that greater than 5% hip-abduction strength asymmetry was associated with upper-extremity injury. While an association does not establish cause and effect, it reinforces the importance of assessing strength symmetry rather than looking only at absolute strength. Adequate hip strength and mobility may also help an athlete achieve an appropriate stride distance and lead-leg position, allowing the pelvis to contribute effectively to force production and transfer.
The Kinetic Chain
The importance of the hips becomes even clearer when we consider the entire kinetic chain. The lower body generates and accepts force. The pelvis transfers and directs that force. The trunk rotates and transfers energy. The shoulder and arm deliver the final movement.
When one link cannot perform its job, another link may have to compensate.
Research by Kibler and colleagues has helped illustrate the potential magnitude of this concept. A reduction in energy contribution from the hip and trunk can require substantially greater rotational demands from the shoulder to produce the same force at the hand.
This is why a seemingly minor hip or groin problem should not always be dismissed as “just a hip problem.” For the overhead athlete, the location of pain is not necessarily the location of the problem. Hip and lower-extremity limitations can alter the way force is generated, transferred, and absorbed throughout the kinetic chain.
Assess — Don't Guess
Our home-grown S.C.O.R.E. Movement Screen evaluates the athlete as a complete system rather than examining the throwing arm in isolation.
For the pelvis and hips, we look at:
Hip mobility
Internal and external rotation
Hip strength
Right-to-left asymmetries
Pelvic control
Single-leg stability
Lower-extremity movement patterns
The athlete's ability to generate and absorb force
This information helps us determine whether an athlete's limitation is primarily a mobility problem, stability problem, strength problem, control problem—or a combination of several factors. Mobility work is often addressed before progressing to higher-load strengthening.
For developing athletes, particularly those going through rapid growth, this can be especially important. Changes in bone length and growth can temporarily alter muscle length, flexibility, coordination, and movement control.
The goal is not simply to make an athlete “more flexible.” The goal is to develop the mobility, strength, stability, and control necessary to use the available range of motion efficiently.
What does the Research Say?
An 18 year study Injury Trends in Major League Baseball from 1998-2015 showed hip, leg and foot injuries account for 31% of total time lost due to injury. A study by Kibler calculated that a 20% decrease in energy delivered from the hip and trunk to the arm requires a 34% increase in the rotational velocity of the shoulder to generate the same amount of force to the hand. This makes a significant case for proper rehabilitation and care to these injuries, even minor “tweaks” and their long-term impact on shoulder and elbow health and durability.
IIn a separate study, Kibler et al. suggested that insufficient hip range of motion and poor balance could greatly impact an athlete's capacity to transfer energy through the kinetic chain, leading to dysfunctional movements and heightened stress on the shoulder and elbow.
The Bottom Line
Strong hips are not just about having strong legs.
For baseball and softball athletes, the pelvis and hips provide the foundation for efficient movement, force production, force absorption, and energy transfer.
When the hips move well and the pelvis is controlled, the athlete has a better opportunity to use the entire kinetic chain rather than asking the shoulder and elbow to do more than their share.
Assess the foundation.
Fix the limitations.
Build the athlete from the ground up.
Start building your foundation today~call us at 224-505-3343 to schedule an evaluation.
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