Adductor Longus Groin Tear: Grade-by-Grade Return to Sport

If a cutting move in training has ever left you dropping to the ground with a sharp pull deep in your inner thigh, the real question afterward is not when the swelling goes down but when you can sprint at full speed again. Pain often eases within ten days, yet the moment you strike a ball hard, a faint pull lingers in the inner thigh. Plenty of athletes and trainers are unsure whether to push through that lingering sensation or wait it out.

The adductor longus carries the largest eccentric load of any adductor muscle during the kick backswing, impact, and sharp changes of direction, and most acute groin muscle injuries in athletes occur near this muscle's myotendinous junction. This article is not a general overview of adductor injuries; it focuses on adductor longus tears by grade and, for each grade, what you actually need to confirm before deciding on return to sport. The standard here is not whether pain has gone away but whether strength numbers and functional tests have been passed. Related reading: Copenhagen Adductor Plank Exercise

Adductor Longus Tears: Getting the Grade Right Is Where Return Decisions Start

The adductor group is made up of five muscles: adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus. The adductor longus tears far more often than the others because of where it attaches. While the other adductors spread across a relatively wide area of the pelvis and share the load, the adductor longus converges as a tendon onto a narrow point just below the pubic tubercle, concentrating the force from kicking or sliding onto that single spot. Cohorts that have imaged acute groin injuries in soccer players with ultrasound or MRI have repeatedly reported the adductor longus accounting for a large share of the injured muscles.

Clinical Grade and Structural Grade Use the Same Numbers but Tell Different Stories

The 1-to-3 grading commonly used in the clinic is based on clinical findings such as tenderness, pain on resisted adduction, and manual strength testing. Structural grading on MRI or ultrasound, by contrast, looks at whether there is only edema, whether some muscle fibers are torn, or whether the muscle or tendon is completely torn and retracted. The problem is that the two grades do not always line up. It is not uncommon for an athlete whose early pain is mild enough to look like a grade 1 or 2 clinically to turn out to have a substantially larger structural injury on imaging, and that mismatch is exactly where premature return decisions tend to happen.

Serner and colleagues (2015, American Journal of Sports Medicine) prospectively studied 110 athletes with acute groin injuries and found that the number and severity of clinical findings correlated significantly with the extent of injury seen on MRI, though not perfectly, and that athletes with more extensive imaging findings tended to have significantly longer time-loss. The study, however, was a single cohort drawn mostly from male soccer and ice hockey players and did not track re-injury rates over the long term, so applying its findings directly to other sports or to female athletes should be done cautiously. Related reading: Hip Flexor Stretch Guide

Grade-by-Grade Timelines and Return Decision Points

Answering how many weeks with a single number off a calendar is risky. Two athletes with the same grade 2 tear can diverge widely: one returns safely at three weeks, another still has a strength asymmetry at six weeks. The ranges below are averages; the actual return decision should rest on the objective tests covered further down.

Grade 1: Mostly Edema, No Structural Tear

Pain usually drops substantially within one to two weeks, and once pain on resisted adduction falls to 2 out of 10 or lower, straight-line jogging and low-intensity change-of-direction drills can begin. Even so, the absence of pain does not mean jumping straight into sprinting or kicking drills. Strength should be brought level with the uninjured side through isometric and then isotonic work before progressing.

Grade 2: Partial Tear, the Zone With the Most Re-Tears

This grade 2 zone is where re-tears happen most often in clinical practice. Pain itself frequently settles substantially within two to three weeks, leading the athlete to feel fully recovered, but fiber healing and strength recovery lag well behind that. Plan on a standard two-to-six-week rehab window, and avoid moving into sport-specific training while injured-side strength remains below 80% of the uninjured side.

Grade 3: Complete Tear or Tendon Avulsion

If a palpable gap is present or MRI shows a noticeably retracted tendon, plan for a minimum of eight weeks and often more than three months of rehabilitation. In some proximal complete tears, particularly in young, active athletes with substantial tendon retraction, surgical repair is considered, in which case the return timeline follows a separate post-operative rehab protocol. For grade 3, using the point pain disappears as the benchmark for return discussions is inappropriate on its own; imaging re-evaluation and strength testing must both be reviewed.

Phase-by-Phase Rehab Exercises: What to Actually Do

The four exercises below form a single progression line regardless of grade; which stage you start at depends on pain and grade. Grade 1 athletes often start at the second exercise, while a grade 3 tear can take one to two weeks just to clear the first exercise pain-free.

Exercise 1: Isometric Ball Squeeze

• Starting position: Lie on your back with knees bent to 90 degrees, a stability ball or cushion held between the knees.
• Movement: Press the knees inward against the ball and hold for 5 to 10 seconds, then release slowly. Because this is a static contraction, keep the knee angle fixed throughout.
• Breathing: Do not hold your breath through the effort; exhale briefly as you begin the press, then breathe shallowly and regularly while holding.
• Sets and frequency: 8 to 10 reps per set at an intensity that keeps pain at 3 out of 10 or lower, 3 to 5 sets per day.
• Common mistake to correct: Many athletes rock the pelvis or fire the glutes along with the squeeze. Rest a hand on the lower abdomen and confirm that the effort stays isolated to the adductors.
• Stop signal: If a sharp pain flashes deep in the groin during the press, or resting pain the next morning is clearly worse than the day before, back off the intensity and rest for a day or two.

Exercise 2: Side-Lying Adductor Lift

• Starting position: Lie on the injured side, top leg bent with the knee planted in front for support, bottom leg straight.
• Movement: Lift the bottom leg roughly 15 to 20 cm off the floor, hold for two seconds, then lower slowly. Keep the toes pointing forward and the pelvis still, without rocking front to back.
• Breathing: Exhale as the leg lifts, inhale as it lowers.
• Sets and frequency: 12 to 15 reps for 3 sets, 4 to 5 times per week. Once 15 reps are comfortable and pain-free, add a light resistance band at the ankle.
• Common mistake to correct: Jerking the leg up quickly is a frequent error. Counting two seconds up and three seconds down keeps the tempo controlled and makes the stimulus on the muscle far more precise.
• Stop signal: If a twinge of pain fires in the groin the instant the leg lifts, or the leg visibly shakes with pain partway through a set, stop for the day.

Exercise 3: Bent-Knee Copenhagen Variation

• Starting position: Lie on your side with the top knee resting on a bench or sofa, forearm supporting the upper body, and the bottom leg bent with the knee lightly touching the floor.
• Movement: Lift the hips to form a straight line from shoulder to knee and hold that position. Simply sustaining the hold provides the eccentric-style loading, so no additional large movement is needed.
• Breathing: Exhale as you lift into position, then keep breathing shallowly and continuously through the hold rather than holding your breath.
• Sets and frequency: Hold 15 to 20 seconds for 4 to 6 reps per set, 2 to 3 times per week. Keep holds short in week one and extend the hold time from week three onward.
• Common mistake to correct: The hips often sag, letting the body curl into a C-shape. Check in a mirror or with a partner that shoulder, hip, and knee stay in one line, and shorten the hold rather than let form break down while grinding it out.
• Stop signal: If the hold produces a deep tearing sensation in the inner thigh rather than simple tension, or the area visibly swells afterward, stop immediately, apply ice, and hold off progressing to the next stage.

Exercise 4: Straight-Leg Copenhagen and Slider Eccentric Adduction

• Starting position: Either the same side-lying position as Exercise 3 with the bottom leg fully straight, or, on a smooth floor, feet on a slider or towel with the legs spread out to the side.
• Movement: For the straight-leg Copenhagen, lift the hips and hold the body in a straight line. For the slider version, spread the legs apart as far as comfortable (the eccentric phase), then pull them back together slowly using adductor strength. Slowing the spreading phase to three seconds or longer is the key detail.
• Breathing: Inhale as the legs spread apart, exhale as they pull back together.
• Sets and frequency: Copenhagen holds of 8 to 12 seconds for 4 to 6 reps; slider reps of 10 to 12 for 3 sets, 2 to 3 times per week.
• Common mistake to correct: Letting the legs drop apart quickly is common, and it erases the eccentric stimulus. Simply halving the speed of the spreading phase changes the training effect noticeably.
• Stop signal: If strength suddenly gives way at the end range of the spreading phase, or a sharp pain flashes through, stop that set immediately and retry the next session with a shorter range of motion.

Grade-by-Week Progression Table

When Not to Do These Exercises at This Stage

• If a palpable defect is present or bruising is spreading rapidly within a day or two, hold off on every exercise above until a complete tear has been ruled out on imaging.
• If resting pain is 7 out of 10 or higher, do not even start the isometric ball squeeze; prioritize icing and rest until pain settles.
• If the athlete is on anticoagulants or a hematoma at the injury site is still expanding, postpone Exercises 3 and 4, which involve stretching, until the hematoma has resolved.
• In adolescent athletes with particularly sharp tenderness at the pubic attachment, rule out an avulsion fracture first and do not start resistance exercise on your own before that is confirmed.
• If local warmth or systemic low-grade fever accompanies the injury, seek care immediately to rule out causes other than muscle injury, such as infectious myositis.

Objective Tests to Pass Before Return

Grade and week number are only reference points; the actual return decision is safer when it rests on passing a set of objective tests. It is common in practice to see an athlete cleared on self-reported pain alone end up back in the clinic with a re-tear.

Copenhagen Five-Second Squeeze Test

The Copenhagen five-second squeeze test, developed and validated by Thorborg and colleagues (2017, British Journal of Sports Medicine), is a simple field test in which an examiner places a hand or a pressure device between the athlete's knees and the athlete squeezes as hard as possible for five seconds while the force is measured. The study found the test result correlated significantly with self-reported hip and groin function scores (HAGOS) and showed high inter-rater reliability, positioning it as a repeatable field measure that needs no special equipment. That said, it was validated in a soccer-player population and does not offer separate cutoff values by injury grade, so it is more realistic to use it for tracking relative recovery against a pre-injury baseline or the uninjured side than as an absolute pass line.

Bilateral Strength Symmetry

Isometric adductor strength measured with a handheld dynamometer should reach at least 90% of the pre-injury value or of the uninjured leg before moving into sport-specific training. Without a pre-injury baseline, comparison to the uninjured side alone is a workable practical benchmark.

Pain-Free Movement Reproduction

The athlete should be able to complete 10 maximal-effort sprints, 10 sharp changes of direction, and 20 inside-of-foot kicks without pain. If pain reproduces on any single item, that item alone should be dialed back to a lower intensity and repeated.

Next-Day Response Check

The morning after testing, confirm that resting pain or stiffness has not worsened compared with before the test. Factoring in this delayed response before clearing return is safer than judging on same-day condition alone.

Signs That Call for Imaging and a Specialist

• A palpable defect or rapidly spreading severe bruising right after injury (suspected complete muscle tear)
• Severe groin pain on weight-bearing that makes walking itself difficult
• Pain spreading widely beyond the groin into the lower abdomen, perineum, or inner thigh
• No improvement in pain or strength loss after a standard two-to-three-week rehab period
• Repeated re-tears at the same site

The Doha agreement, published by Weir and colleagues (2015, British Journal of Sports Medicine), proposed an internationally agreed classification system dividing groin pain into adductor-related, iliopsoas-related, pubic-related, inguinal-related, and hip-related categories. The classification reflects consensus among sports medicine specialists worldwide, but the agreement itself acknowledges a limitation: in real clinical practice, multiple categories frequently overlap, and no single test cleanly separates them. Hip labral tears often come with a deep clicking or catching sensation at the front of the hip, while osteitis pubis is characterized by bilateral groin pain that worsens on hip abduction. When symptoms are not typical, seeing a specialist rather than continuing self-directed rehab tends to shorten recovery rather than lengthen it. Related reading: Hip Labral Tear Rehab Guide

Long-Term Management to Prevent Recurrence

A meta-analysis by Esteve and colleagues (2015, British Journal of Sports Medicine) pooling data from more than 8,700 athletes reported that groups following prevention programs that included adductor strengthening had substantially lower groin injury risk, with a risk ratio of roughly 0.33. In other words, athletes on a prevention program sustained injuries at about a third the rate of controls. The analysis also noted that the included studies varied widely in program design, introducing meaningful heterogeneity, and that most of the underlying data came from male soccer and ice hockey players, so generalizing directly to female athletes or other sports should be done with caution.

Managing Athletes With a Prior Tear

Athletes with a previous adductor tear carry a significantly elevated re-injury risk. Maintaining Exercise 3 or 4 level work once or twice a week throughout the season, and breaking training load into finer increments during the early preseason ramp-up, matters most for this group.

Training Load Management

Applying an acute-to-chronic workload ratio, keeping weekly training load from exceeding 1.5 times the prior four-week average, helps reduce injury risk during periods when training intensity ramps up quickly. Keeping the Copenhagen adductor exercise in the program once or twice weekly during the off-season, and flagging athletes with a bilateral strength difference of 15% or more on preseason screening as higher risk for an individualized prevention plan, is a practical recommendation.