A groin injury is damage to one or more of the muscles, tendons, or other soft tissues in the inner thigh and lower pelvis, most often involving the adductor muscles that pull the leg inward. These injuries range from mild strains that sideline you for a few days to complete muscle tears that take months of rehabilitation or even surgery to resolve. The groin is an anatomical crossroads where several muscle groups, ligaments, and joint structures converge, which is partly why injuries there are so common in sports and so frustratingly slow to diagnose clearly.
What Structures Are Actually Involved
When people say “groin injury,” they usually mean the adductor muscle group on the inner thigh, especially the adductor longus. That muscle runs from the front of the pubic bone down to the middle of the thighbone, and it takes enormous strain during lateral movements, kicking, and sprinting. But the groin region is more complex than a single muscle. The adductor longus attaches to the pubic crest and the anterior pubic ligament, which also serves as an anchor point connecting the lower abdominal wall to the fascia of the thigh.1PubMed Central. The pyramidalis–anterior pubic ligament–adductor longus complex (PLAC) and its role with adductor injuries: a new anatomical concept This means the adductor longus does not work in isolation. It is mechanically linked to the abdominal muscles and pelvic ligaments through shared attachment points, and an injury to one structure can create stress or pain in neighboring ones.
Other structures that can produce groin pain include the iliopsoas (the deep hip flexor), the inguinal canal (where hernias develop), the pubic symphysis joint at the front of the pelvis, and the hip joint itself. This overlap is exactly why “groin injury” is more of a location label than a precise diagnosis.
How Groin Injuries Are Classified
For years, doctors and researchers used a jumble of overlapping terms for groin pain, which made it hard to compare studies or even agree on what a patient had. In 2015, an international panel reached unanimous agreement on a standardized classification system, now known as the Doha agreement. It divides groin pain in athletes into three broad categories: defined clinical entities (adductor-related, iliopsoas-related, inguinal-related, and pubic-related groin pain), hip-related groin pain, and other causes.2PubMed Central. Doha agreement meeting on terminology and definitions in groin pain in athletes
The system works well when one entity is clearly responsible for the pain, but in practice, many athletes have overlapping problems. When two examiners independently classified athletes with a single source of groin pain, they agreed perfectly. But when athletes had multiple overlapping entities, agreement between examiners dropped considerably, ranging from slight to moderate depending on the category.3PubMed Central. Inter‐examiner reliability of the Doha agreement meeting classification system of groin pain in male athletes This is worth knowing if you are dealing with groin pain that does not neatly fit one label: the diagnostic picture is genuinely murky, even for experienced clinicians.
How Groin Strains Are Graded
The most common groin injury is a strain of the adductor muscles, and these are graded on a three-tier scale based on severity. A grade 1 strain involves minor fiber damage with pain but relatively little loss of function or playing time. A grade 2 strain means a partial tear with more pain, weakness, and a longer recovery. A grade 3 strain is a complete rupture of the muscle or tendon, with total loss of muscle function.4PubMed Central. Groin injuries in sports medicine
Grade 1 strains are by far the most common. You feel a twinge or tightness in the inner thigh, and it hurts to squeeze your legs together or sprint, but you can still walk normally. Grade 2 injuries produce sharper pain, possible bruising, and a noticeable drop in strength. Grade 3 tears are the least common but the most dramatic. There may be an audible pop, immediate severe pain, visible bruising, and an inability to contract the muscle at all. Grade 3 injuries often require imaging and may need surgical repair.
Causes and Injury Mechanisms
Most adductor strains happen during explosive movements that stretch the muscle while it is also trying to contract. A video analysis of severe adductor longus injuries in professional soccer players found two main patterns. In closed-chain injuries, where the foot is planted on the ground, the hip is typically in a combination of extension, abduction, and external rotation at the moment of injury. In open-chain injuries, like a kicking motion where the leg is swinging freely, the common thread was hip abduction, external rotation, and a rapid switch from hip extension to flexion.5PubMed Central. Mechanisms of Severe Adductor Longus Injuries in Professional Soccer Players: A Systematic Visual Video Analysis
Biomechanical research on the soccer kick offers a closer look at why this is dangerous. During a maximal-effort kick, the adductor longus is being stretched at its fastest rate while the hip is extending, around the first half of the swing phase. The muscle is also electrically active during this period, meaning it is contracting while being lengthened. The adductor longus appears to be most vulnerable to strain during this transition from hip extension to hip flexion.6PubMed. Adductor longus mechanics during the maximal effort soccer kick In plain terms, the muscle is being asked to do two things at once: absorb a stretch and generate force, and the moment where it switches roles is when it is most likely to tear.
You do not need to be a soccer player to suffer a groin strain. Any activity involving sudden lateral movements, lunging, skating, sprinting, or change of direction can cause one. Hockey players, rugby players, and runners all report groin injuries regularly.
Who Is Most at Risk
The single strongest predictor of a groin injury is having had one before. Systematic reviews have consistently found that a prior groin or hip injury stands out across multiple studies, with odds ratios ranging from about 2.6 to 7.3 depending on the population studied.7British Journal of Sports Medicine. Risk factors for groin/hip injuries in field-based sports: a systematic review Other well-supported risk factors include weak adductor muscles (both in absolute terms and relative to the hip abductors), higher level of play, and lower amounts of sport-specific preseason training.8British Journal of Sports Medicine. Risk factors for groin injury in sport: an updated systematic review
Men are substantially more likely to suffer groin injuries than women when playing the same sport, with roughly two and a half times the risk according to a systematic review of elite team sports.9British Journal of Sports Medicine. Men at higher risk of groin injuries in elite team sports: a systematic review Differences in hip and pelvis shape between the sexes have been proposed as a contributing factor, though the exact reasons are still not well understood.10British Journal of Sports Medicine. Epidemiology of hip and groin injuries in sport: a systematic review with meta-analysis and meta-regression of 5914 injuries from over 9 million exposure hours
Clinical Examination and Screening
Diagnosis starts with a hands-on exam. For suspected adductor-related pain, clinicians typically test resisted adduction (squeezing the legs together against resistance), palpate along the adductor tendons, and check for pain with stretching. In athletes with adductor-related groin pain, tenderness at the adductor longus origin near the pubic bone is almost universal, found in about 94% of cases.11PubMed. Clinical examination tests for adductor- and pubic-related groin pain in athletes with longstanding groin pain: Inter-examiner reliability and prevalence of positive tests
A simple screening tool that has shown promise is the adductor squeeze test, where you squeeze a pressure cuff between your knees while lying down. In one study of Gaelic football players, those whose preseason squeeze strength fell below a certain threshold were nearly eight times more likely to sustain a groin injury during the season.12PubMed. Pre-season adductor squeeze test and HAGOS function sport and recreation subscale scores predict groin injury in Gaelic football players Pain during the test raised the odds further. This kind of screening is straightforward enough to do in a preseason physical and may help flag athletes who would benefit from targeted strengthening before the season starts.
When Imaging Helps
Most mild groin strains do not need imaging. Your doctor can diagnose a straightforward adductor strain from the history and physical exam alone. Imaging becomes valuable when the pain is vague or poorly localized, when it does not respond to initial treatment, or when a more serious injury needs to be ruled out.
MRI is considered the most useful tool for groin pain. It can detect pathology in the adductor tendons, the abdominal wall, the pubic bone, and the hip joint, making it especially helpful when groin pain could be coming from multiple sources.13PubMed Central. Imaging of Groin Pain: Magnetic Resonance and Ultrasound Imaging Features Ultrasound has the advantage of being done in real time, which is useful for evaluating the pubic symphysis region and for guiding injections. For suspected inguinal hernias, MRI and ultrasound both outperform physical examination alone. In one study comparing the three approaches against surgical findings, physical examination detected about three-quarters of herniations, while MRI caught roughly 95%.14PubMed. Detection of groin hernia with physical examination, ultrasound, and MRI compared with laparoscopic findings
Conditions That Mimic or Overlap With Groin Strains
Not every groin pain is a simple muscle pull. Several conditions produce similar symptoms and can coexist with adductor strains, which makes the diagnostic picture more complicated.
Athletic pubalgia, sometimes called a “sports hernia,” refers to disruption of the tissue where the lower abdominal wall meets the pubic bone, often with some degree of adductor tendon involvement.15PubMed Central. Athletic pubalgia and associated rehabilitation The widely accepted explanation involves an imbalance between strong hip adductor muscles and relatively weaker lower abdominal muscles. The pull of the adductors, especially against a planted foot, creates a shearing force across the pelvis that can stretch or tear the tissue of the posterior inguinal wall.16PubMed Central. Groin Injuries (Athletic Pubalgia) and Return to Play This is not a true hernia in the traditional sense, which is part of why the term “sports hernia” has fallen out of favor.
Osteitis pubis is an overuse condition affecting the pubic symphysis and the surrounding bone. It tends to develop in athletes who do a lot of kicking, twisting, and cutting. The pain is usually felt at the front of the pelvis and can radiate into the groin, inner thigh, or lower abdomen.17Current Sports Medicine Reports. Osteitis Pubis in Athletes It is thought to result from repetitive microtrauma and instability at the pubic symphysis.18PubMed Central. Osteitis pubis in elite athletes: Diagnostic and therapeutic approach
Hip joint problems are another major source of groin pain that gets mistaken for a muscle injury. In a six-year review of nearly 900 cases of groin pain in athletes, hip joint pathology turned out to be the most common diagnosis, accounting for about 56% of cases. The leading hip conditions were femoroacetabular impingement, labral tears, and osteoarthritis.19PubMed. Hip Joint Pathology as a Leading Cause of Groin Pain in the Sporting Population: A 6-Year Review of 894 Cases That is a striking number, and it highlights why persistent groin pain that does not improve with standard adductor rehab deserves a closer look at the hip joint.
Recovery and Rehabilitation
For the majority of groin strains, treatment is nonsurgical: rest, a graduated exercise program, and a slow return to activity. The timeline depends on the severity. Grade 1 strains may resolve in one to three weeks. Grade 2 strains typically need four to eight weeks. Grade 3 tears can take three months or longer.
The cornerstone of adductor rehabilitation is a structured strengthening program. For long-standing adductor-related groin pain, exercise protocols that combine isometric, concentric, and eccentric strengthening of the adductors and surrounding hip muscles have shown good results. A modified version of the well-known Hölmich protocol, which adjusts the progression to be more gradual, has been studied as a safer and potentially more effective approach for promoting return to sport in athletes with chronic groin pain.20PubMed Central. The Effect of Therapeutic Exercise on Long-Standing Adductor-Related Groin Pain in Athletes: Modified Hölmich Protocol
When conservative treatment fails after several months, surgery becomes an option. For recalcitrant groin strains, surgical release of the adductor longus tendon, sometimes combined with repair of the abdominal wall, has produced encouraging outcomes. In one series of elite athletes who had failed nonoperative management, 97% returned to their sport after surgery, and 94% returned at their previous level of play, with an average recovery time of about 12 weeks from the procedure.21PubMed Central. Surgical Release of the Adductor Longus With or Without Sports Hernia Repair Is a Useful Treatment for Recalcitrant Groin Strains in the Elite Athlete These numbers come from elite athletes with access to top-tier rehabilitation, so the timeline may differ for recreational athletes, but the high return-to-play rate is reassuring for cases where nonsurgical treatment has hit a wall.
Return-to-Play Decisions
Deciding when an athlete is ready to return to full activity after a groin injury has traditionally relied on symptoms: does it still hurt? But the field is moving toward a more objective, capacity-based approach that integrates strength testing, movement quality assessment, and workload data from GPS tracking.22PubMed. Which Criteria Determine Return-to-Play Decisions Following Hip and Groin Injuries in Soccer Players: A Scoping Review
An expert consensus on return-to-play after adductor longus injuries validated 14 criteria, including absence of pain on palpation, restored flexibility, strength measurements showing side-to-side symmetry, movement quality during change-of-direction tasks, and performance under simulated match conditions.23PubMed Central. Consensus of Return-to-Play Criteria After Adductor Longus Injury in Professional Soccer The central idea from return-to-play research is that athletes should demonstrate both adequate strength (especially eccentric and isometric adductor strength that is symmetric between sides) and confidence during sport-specific movements without pain.24PubMed Central. Return to Play in Long-Standing Adductor-Related Groin Pain: A Delphi Study Among Experts Standardized thresholds for when exactly an athlete clears each criterion are still being developed, which means return-to-play decisions remain partly a judgment call.
Can You Prevent Groin Injuries
The Copenhagen adduction exercise, a partner-based side-lying exercise that loads the adductors eccentrically, has become one of the most popular preventive tools. The evidence for it is mixed, though. A cluster-randomized trial of male soccer players found that a broader adductor strengthening program reduced the average prevalence of groin problems during the season by about 41% compared to controls.25British Journal of Sports Medicine. The Adductor Strengthening Programme prevents groin problems among male football players: a cluster-randomised controlled trial But when looking at the Copenhagen exercise specifically across several studies, a meta-analysis found only a small and statistically nonsignificant risk reduction.26PubMed Central. The Copenhagen Adduction Exercise Effect on Sport Performance and Injury Prevention: A Systematic Review With Meta‐Analysis And in rink hockey players, the number of monthly Copenhagen exercise sessions was not associated with groin problem occurrence at all.27PubMed. The dose-response of the Copenhagen adduction exercise on prevention of groin problems in rink hockey: A prospective cohort study
The takeaway is not that adductor strengthening is useless, but that one exercise alone may not be enough. A broader program that builds hip adductor strength relative to abductor strength, addresses preseason fitness gaps, and includes sport-specific conditioning seems to be the more evidence-supported route. Given that weak adductors and a history of previous injury are the two best-documented risk factors, any prevention strategy should focus on those.
Groin Pain in Adolescent Athletes
Teenagers present a unique challenge. Their bones are still growing, and the growth plates (apophyses) around the pelvis have not yet fused. Instead of a muscle strain or tendon tear, a sudden forceful contraction can pull a piece of bone away from the pelvis at the tendon’s attachment point. These avulsion fractures are most common between roughly 14 and 17 years of age, and the most frequently injured sites are the front of the hip bone, followed by the attachment points for the hip flexors and hamstrings.28PubMed Central. Treatment of avulsion fractures of the pelvis in adolescent athletes: A scoping literature review These injuries deserve attention because the treatment decisions differ from adult strains. While many heal with rest, surgical treatment was associated with a higher rate of return to pre-injury activity level in a review of over 450 cases.
If you are a parent or coach, groin pain in a young athlete who has not finished growing should not be written off as “just a pull.” An X-ray can rule out an avulsion fracture quickly, and catching it early matters for treatment planning.
The Psychological Side of Chronic Groin Pain
Groin injuries that drag on for months take a toll beyond the physical. Male athletes with long-standing groin pain have been found to report more pain catastrophizing, greater fear of movement, more depressive symptoms, and lower confidence in their ability to manage their pain, compared to matched healthy athletes. They also showed altered pain sensitivity and lower explosive hip strength, though individual variation was wide.29PubMed Central. Pain Sensitivity, Psychological Factors, and Muscle Function in Male Athletes With Long-Standing Groin Pain and Matched Controls
These findings suggest that for athletes who are not responding to conventional physical rehab, the problem may not be entirely in the tissue. Fear of re-injury can change how you move, which in turn changes the load on the injured area and can perpetuate the cycle. A treatment approach that addresses both the physical deficits and the psychological factors, sometimes called a biopsychosocial model, may be needed for athletes stuck in this pattern. If you have been dealing with groin pain for months and standard exercises are not helping, raising the psychological dimension with your clinician is not a sign of weakness; it is a clinically supported next step.