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Can You Train With a Groin Strain? The Adductor Audit: The Orthopedic Family's Second Muscle File, Where Ekstrand's Nine-Season UEFA Census Puts the Adductors Second Only to the Hamstrings at 23% of 2,908 Muscle Injuries (16% Are Reinjuries and They Keep Players Out Longer Than the Index Tear) and Werner's Seven-Season File Counts Hip/Groin at 12–16% of All Injuries Per Season, Where Hölmich's Lancet Randomized Trial Took 68 Athletes With a Median 40 Weeks of Adductor Pain and Returned 23 of the Active-Training Group to the Same Level Pain-Free Against 4 of the Passive-Physiotherapy Group — 79% vs 14% — With the Blinded Examiner Still Finding the Effect 8–12 Years Later (the First Exercise Treatment Ever Shown to Hold Long-Term for an Overuse Injury), Where Serner's 110-Athlete Prospective Says Kicking Causes 40% of Football's Groin Injuries, the Adductor Longus Owns 91–93% of Them on Imaging and 22% of Acute MRIs Read Negative, Where His Return-to-Sport Cohort Has the Clinical Exam Explaining 63–74% of the Variance in Time Back While MRI Adds at Most 7%, Where His 16 Complete Adductor Avulsions — the Worst Case in the File — Returned in a Median 69 Days on Exercise Alone With Median HAGOS 100 at One Year, Where Hölmich's Own Six-Exercise Prevention Program Missed Significance at HR 0.69 but Taught the Risk File (a Previous Groin Injury Almost Doubles Risk, a Higher Level Almost Triples It), Where Harøy's Single-Exercise Answer — the Copenhagen Adduction, Three Times a Week Preseason, Once In-Season — Cut Groin Problems From 21.3% to 13.5% (OR 0.59) Across 35 Semipro Teams, and Gasparin's Brazilian Elite Women's Cohort Puts Hip/Groin at 13% of Their Injuries: the Groin's Medicine Is the Same as the Hamstring's — Dose, Not Rest — but the Door You Enter Through Is a Name

By RightRep AI Assistant · · 19 min read

There is a fence at the top of this post and it outranks everything below it. A distinct pop or tear in the groin with a defect you can feel under your fingers, bruising that arrives within a day, or an inability to pull your legs together against gravity is a suspected complete adductor avulsion or a grade III tear — imaging before programming, and the surgical-versus-exercise conversation belongs to a clinician who has examined you (the file's own one-year follow-up of 16 complete avulsions treated with exercise alone is reassuring, not a license to skip the picture) [8]. The second fence is the neighborhood: groin pain that worsens with coughing, sneezing or a sit-up, a lump anywhere in the groin, or pain deep in the pelvis — especially in a woman, whose groin file includes gynecological and urological doors men do not have — is a this-week clinician file, because the hernia next door does not heal with adductor exercises [3]. The third fence: night pain, fever, weight loss, or pain that never varies with load belongs with a doctor now, not a program — infection, tumor and a stress fracture of the pubic ramus all present as 'groin pain' too. The fourth fence is absolute: numbness in the saddle area, or new bladder and bowel problems, is an emergency room today — that file is the spine's, not the groin's. And the fifth: an adolescent's groin pain sitting at the bone's growth plate is an apophysis file with its own rules — not this one. What remains after the fences is the question this library's injury family was built for, and the second muscle file after the hamstring: the ordinary adductor strain — the kick that grabbed, the sprint turn that pinched, the squat session that lit up the inner thigh — and what happens to the training week while it heals. One structural fact sets the whole file: the groin is not one injury but a neighborhood of four clinical addresses plus a competing joint, and the field's first act is to name which address you live at before anyone loads anything [3].

The short answer: train — everything above the waist today, the adductor loaded early under pain's rules, kicking and cutting to zero and bought back gate by gate, Copenhagen Adductions for the rest of your life

Strip the file to its spine. This is the muscle file where the rehabilitation evidence is not a debate but a landslide. Sixty-eight athletes with long-standing adductor-related groin pain — median 40 weeks of it, the population rest had already failed — were randomized to an active training program aimed at the muscles acting on the pelvis or to physiotherapy without active training: 23 of the active group returned to sport at the same level without groin pain — 79% — against 4 of the passive group — 14% — with the outcome examination blinded to allocation [5]. And the effect held: at 8–12 years, the follow-up found the benefit still present — the first time an exercise treatment for an overuse musculoskeletal injury was ever shown to last — and even stronger in the 39 footballers (83% of those re-examined) [6]. The prognosis file says the calendar is readable without a magnet: across 81 athletes, the clinical examination and history explained 63–74% of the variance in time to return, with MRI adding at most 7% — a median 15 days to clinically pain-free and roughly three weeks to full training [7]. The worst case in the file — sixteen complete adductor longus avulsions — returned to sport at a median 69 days on criteria-based exercise rehabilitation alone, with median HAGOS scores of 100 across every subscale at one year [8]. And the prevention file is sport's cleanest single-exercise result: after the six-exercise program missed significance (HR 0.69) [9], the Copenhagen Adduction — one exercise, three progressions, three times a week in preseason, once a week in-season — cut average groin problems from 21.3% to 13.5% across 35 semiprofessional teams (OR 0.59, 41% lower risk, p=0.008) [10]. The verdict writes itself: train the whole body, load the adductor early under the pain rules below, cut kicking, cutting and hard change-of-direction first and restore them last, name the address before you load it — and buy the Copenhagens for life [3][5][10].

Who is asking: the scale file

This is not a niche injury — it is one of sport's structural taxes. The census runs on three levels. In professional football, Ekstrand's nine-season UEFA-linked cohort registered 2,908 muscle injuries in 2,299 players across 51 teams: muscle injuries were 31% of all injuries and 27% of total injury absence, a 25-player squad eats about fifteen of them a season, and 92% of them land in the four lower-limb groups — hamstrings 37%, adductors 23%, quadriceps 19%, calf 13% [1]. Sixteen percent were reinjuries, and reinjuries kept players out longer than the index tear — the number that makes the prevention chapter below a treatment chapter [1]. Zoom into the groin itself: Werner's seven-season UEFA study recorded 628 hip and groin injuries, 12–16% of all injuries per season, 1.1 per 1,000 hours — 3.5 in matches against 0.6 in training — across 18 different diagnostic entities, with the adductor group the largest single address [2]. Eighteen entities: the neighborhood's size, and the reason the naming door exists [3]. And the file is not a men's-only file, nor a Europe-only one: in Gasparin's prospective season across four Brazilian elite women's clubs, 47% of 133 players were injured, at 5.0 injuries per 1,000 hours, with knee and thigh tied at 29% each, ankle 17% — and hip/groin at 13%, 48% of all injuries non-contact [12]. The Brazilian reader asking this question in Portuguese is asking it from inside the data.

The first door is a name, not a diagnosis: the Doha file

Every audit family has a naming file — the tendons had tendinopathy not tendinitis — and the groin's is the Doha agreement: an expert consensus that stopped the groin's diagnostic anarchy by naming the pain by its clinical address [3]. Four addresses share the neighborhood: adductor-related (the inner-thigh file this post is about), iliopsoas-related (the hip flexor deep in the front of the groin), inguinal-related (the abdominal-wall file next door) and pubic-related (the bone and its disc in the middle) — with the hip joint named as the competing diagnosis to screen in every case, because the labrum hides behind groin pain and does not heal on adductor reps [3]. Two rules travel with the names: coexistence is the rule, not the exception — more than one address can be involved at once — and the name is made clinically, by history and examination, before imaging is asked to confirm anything [3]. This door is why self-diagnosing "a groin strain" from an inner-thigh bruise is 60% right at best: the census says two-thirds of acute groin injuries are adductor-related [4], which means one in three is something else that merely presents as groin pain.

The mechanism doors: the kick and the cut

What were you doing when it happened? The file's 110-athlete prospective — every athlete examined within seven days of an acute groin injury — priced the mechanisms exactly: in football, kicking caused 40% of the injuries; in the other sports, change of direction led at 31% [4]. Clinically, adductor-related injuries were 66% of the whole cohort, and on imaging the adductor longus owned the file at 91% on ultrasound and 93% on MRI — with the iliopsoas and proximal rectus femoris (the hip-flexor addresses) involved in 15–25% depending on the modality [4]. Then the number that humbles every MRI-first instinct in the sport: 22% of the acute MRI scans were negative — athletes with real, mechanism-consistent, examination-positive groin injuries whose acute images read clean [4]. The image does not own this diagnosis; the history and the hands do. It also means a clean scan in week one is not a license to skip the loading program — the tissue was still torn by the kick or the cut, and it still heals by dose.

The inversion at the heart of this file: the program that buried passive physio

Every family post has one trial that anchors it; the groin's is Hölmich's Lancet randomized trial, and it deserves its exact reading. Sixty-eight athletes with long-standing adductor-related groin pain — median 40 weeks — the exact population that stretching, massage, rest and anti-inflammatories had already failed for months — were randomized after a standardized examination to two eight-to-twelve-week programs: an active training program built to improve the strength and coordination of the muscles acting on the pelvis, in particular the adductors, or a physiotherapy program without active training (massage, stretching, laser, TENS — the passive menu of the era). Four months after treatment, a physician blinded to allocation re-examined everyone. The result: 23 athletes in the active-training group returned to their sport at the same level without groin pain — 79% — against 4 in the passive group — 14% [5]. This is among the largest effect gaps in the entire rehabilitation literature, and it was won by loading the tissue that hurt. The 8–12-year follow-up then did what almost no exercise trial has ever done: it came back. Forty-seven of the original participants (80%) were re-examined with the identical protocol by a physician unaware of their origin — and the effect was still there (P=.047), stronger still in the 39 footballers (P=.012), the first demonstration that an exercise treatment for an overuse musculoskeletal injury lasts [6]. Rest did not merely fail this population; it had already been failing them for a median 40 weeks before the trial [5].

The prognosis door: your hands predict the calendar better than the magnet

How long is this going to take? The file's return-to-sport cohort of 81 male athletes with acute adductor injuries — each examined within seven days, each run through the same criteria-based rehabilitation — answered it with a hierarchy that should reorganize every gym conversation about scans [7]. The milestones: a median 15 days to clinically pain-free, with controlled sports training completed at a median 24 days and first full team training at 22 [7]. The predictors: the standardized clinical examination plus the patient history explained 63%, 74% and 68% of the variance in time to the three milestones — and adding MRI improved those numbers by 7%, 0% and 7% [7]. The strongest clinical predictors of a slower return: pain on palpation of the proximal adductor longus insertion, and a palpable defect; the strongest imaging predictor, when MRI did speak, was injury at the bone-tendon junction [7]. The practical translation: the two things a clinician's fingers found in week one priced the calendar better than the scanner did — and for the programming question that this whole family of posts exists for, when does the loading start, the answer is not on any image: it is in the pain rules below.

The even-the-worst-case door: the complete avulsion is still an exercise file

The sentence every athlete with a bad groin tear fears is "it's completely off the bone." The file's answer is its most surprising cohort: 16 competitive male athletes with complete proximal adductor longus tendon avulsions — diagnosed within seven days — all advised to complete a supervised, criteria-based rehabilitation protocol. No surgery. At a median of one year: one lost to follow-up, one early reinjury that rehabbed again, and a median 69 days from injury to return to sport — with median HAGOS scores of 100 on every subscale and an OSTRC overuse score of 0: by the questionnaire, indistinguishable from uninjured [8]. Strength symmetry sat at 92–93% on the eccentric adduction tests [8]. This does not make an avulsion a self-treatable file — it is exactly the fence from the top of the post, imaging and a clinician first [8] — but it relocates the default: in this cohort, even the complete tear's first door was exercise.

The prevention door: from a near-miss to a one-exercise win

The prevention chapter is the file's strongest, and it opens with an honest miss. Hölmich's own first attempt — a cluster-randomized program of six exercises (concentric and eccentric strengthening, coordination, core stability) across roughly a thousand players in 44 completing clubs — produced HR 0.69: a 31% risk reduction that did not clear significance (CI 0.40–1.19) [9]. But the miss carried two findings worth more than most hits: a previous groin injury almost doubled the risk of a new one, and playing at a higher level almost tripled it [9] — the recurrence engine this family keeps meeting (16% of the muscle-injury census were reinjuries, out longer than the first tear [1]). Then the file pivoted to the mechanism. The Copenhagen Adduction exercise — the partner exercise lying sideways, legs scissored, lifting the top leg against gravity's pull on the inner thigh — was shown in randomized fashion to build large eccentric hip-adduction strength increases in footballers [11], the exact capacity the injury removes and the risk file points at. So Harøy's team asked the minimal question: one exercise, three progressions, three times a week through preseason, once a week through the competitive season — against training as normal. 35 semiprofessional teams, 652 players, cluster-randomized: average groin-problem prevalence 13.5% in the intervention group against 21.3% in controls — OR 0.59 (CI 0.40–0.86), a 41% lower risk, p=0.008 [10]. One exercise, zero equipment beyond a partner and a floor, bought nearly half the risk back — including for players whose groin had already torn, exactly the doubled-risk group the first trial identified [9][10]. If this post has a vaccination, that is it.

The programming door: what trains, what modifies, what stops

The training-through file, organized the way the injury family does it — by what the week actually contains:

  • The upper body never stopped. Pressing, pulling, arms, trunk work that does not demand adduction against load: train it as programmed from day one. In the file's own logic, the pelvis-stabilizing musculature is not a bystander — coordination and core work were core components of both prevention programs [9].
  • The healthy side carries the file. Single-leg work on the uninjured leg trains the injured one through the cross-education effect every family post leans on — and preserves the symmetry scoreboard the return gates will read [7].
  • The adductor loads early — by pain's rules. The tissue that hurts is the tissue that heals, at 79%-vs-14% odds [5]: begin with isometric adduction squeezes at tolerable intensity in the first quiet days, progress through the Copenhagen ladder's early levels and controlled range-of-motion work, using the family's pain traffic light — pain that settles by the next morning and trends flat-to-better over the week is green; worse two mornings running is amber, drop a rung [5][7].
  • Kicking, cutting and hard change-of-direction go to zero first and come back last. They are the injury's mechanisms — the kick at 40% of football's file, the cut at 31% elsewhere [4] — so they are the last loads to restore, ladder-style: straight-line jogging, then gentle directional work, then progressive cutting, then kicking a ball at walking intensity, then striking. Conditioning survives on the bike, rower and zone-2 work that never asks the adductor to decelerate a swinging leg.
  • The squat and the hinge modify by stage, not by fear. Deep squats and wide-stance work load the adductors at long lengths — the therapeutic direction at the right dose [5]. Quiet phase: continue at conservative depth and load, tempo controlled. Irritable phase: narrow the stance, shorten the depth, lighten, or move the pattern to a machine — but do not delete the pattern for weeks; the loading program is the recovery engine [5][6].
  • The morning is a measurement. Stiffness and first-steps pain in the groin, scored 0–10 daily: the cheapest gauge in the file — a week trending down buys the next rung of the kick/cut ladder; a week trending up sells one back [7].
  • What stops everything: the fences from the top — the pop with a palpable defect or fast bruising (avulsion file: imaging first [8]), cough/sneeze pain or a lump (hernia door: clinician this week [3]), night pain or systemic signs (the rare-file door), saddle numbness or bladder changes (the emergency), the adolescent growth plate. None of those train through.

So what do you actually do? The practical file

Six rules, every one sourced from the files above:

  1. Rule out the fences before you program. Pop with a defect or bruising, can't-adduct, cough/sneeze pain, a lump, night pain, saddle numbness: clinician first, post second [3][8].
  2. Name the address before you load it. Adductor-, iliopsoas-, inguinal-, pubic-related or the hip behind them all: the Doha door decides which program, and the hip's own file does not heal on adductor reps [3].
  3. Load the adductor early, by the traffic light. 79% vs 14% is not a nuance — the program starts in days, not weeks, and progresses daily by the morning-after test [5].
  4. Cut the kick and the cut to zero; buy them back rung by rung. They are the mechanisms; the bike and the row keep conditioning alive until criteria — not comfort — restore them [4][7].
  5. Let the calendar be clinical. Palpation pain at the proximal insertion and a palpable defect predict slow; the median file runs about two to three weeks to training — track the trend, not the scan [7].
  6. Vaccinate the future: Copenhagen Adductions, for life. One exercise, three progressions, three-a-week preseason, one-a-week in-season — OR 0.59, and most of all for the groin that already tore once [9][10][11].

How RightRep fits into this

This condition is, at its core, a counted-load and symmetry problem — and it is unanswerable without a record:

  • The rehab ladder, logged like a training block. The adductor progression and the kick/cut ladder are training programs [5][7] — reps counted, rungs marked: the block that ended the injury sits in your history next to your squats, not in a physio PDF you lost.
  • The morning biomarker beside the training log. Daily groin-stiffness scores next to the sessions that might have caused them — the amber-before-reinjury signal this file's 16% reinjury rate [1] exists to prevent.
  • Symmetry you can see. The injured leg quietly becomes the healthy leg's shadow for weeks — rep-counted, rep-scored single-leg work keeps the imbalance visible until the return gates read it [7].

The bottom line

  • The scale: adductors are 23% of 2,908 muscle injuries across 2,299 professionals — second only to hamstrings at 37%; 16% are reinjuries and they keep players out longer; hip/groin runs 12–16% of all injuries per UEFA season across 18 diagnostic entities [1][2].
  • The name: the Doha agreement files groin pain by address — adductor-, iliopsoas-, inguinal-, pubic-related — with the hip joint screened in every case and coexistence the rule [3].
  • The mechanisms: kicking 40% of football's acute groin injuries, change of direction 31% elsewhere; adductor-related 66%; adductor longus 91–93% on imaging; 22% of acute MRIs negative [4].
  • The spine: active training returned 23 of 68 (79%) to the same level pain-free against passive physio's 4 (14%) — blinded assessment, a median 40-week chronic population — and the effect was still present 8–12 years later, the first ever shown to last for an overuse injury [5][6].
  • The prognosis: clinical exam plus history explains 63–74% of variance in time to return, MRI adds ≤7%; proximal-insertion palpation pain and a palpable defect are the strongest predictors; median 15 days pain-free, ~3 weeks to training [7].
  • The worst case: 16 complete avulsions, exercise only, median 69 days to return, median HAGOS 100 across subscales at one year [8].
  • The prevention: the six-exercise program missed at HR 0.69 but found the risk engine (prior injury ~2×, higher level ~3×); the Copenhagen Adduction program cut groin problems 21.3% → 13.5% (OR 0.59, 41% lower risk) across 35 teams [9][10][11].
  • The Brazil anchor: 4 elite women's clubs, 5.0 injuries/1,000 h, hip/groin 13% of all injuries — the file is not a men-only file [12].

Name the address, load the adductor, earn the kick back one rung at a time — and let the camera keep the reps honest at rightrep.app.

This post was written by the RightRep AI Assistant — the same AI that counts and scores your reps at rightrep.app.

Sources

  1. Ekstrand J, Hägglund M, Waldén M. Epidemiology of muscle injuries in professional football (soccer). American Journal of Sports Medicine, 2011;39(6):1226–1232. pubmed.ncbi.nlm.nih.gov
  2. Werner J, Hägglund M, Waldén M, Ekstrand J. UEFA injury study: a prospective study of hip and groin injuries in professional football over seven consecutive seasons. British Journal of Sports Medicine, 2009;43(13):1036–1040. pubmed.ncbi.nlm.nih.gov
  3. Weir A, Brukner P, Delahunt E, et al. Doha agreement meeting on terminology and definitions in groin pain in athletes. British Journal of Sports Medicine, 2015;49(12):768–774. pubmed.ncbi.nlm.nih.gov
  4. Serner A, Tol JL, Jomaah N, et al. Diagnosis of acute groin injuries: a prospective study of 110 athletes. American Journal of Sports Medicine, 2015;43(8):1857–1864. pubmed.ncbi.nlm.nih.gov
  5. Hölmich P, Uhrskou P, Ulnits L, et al. Effectiveness of active physical training as treatment for long-standing adductor-related groin pain in athletes: randomised trial. The Lancet, 1999;353(9151):439–443. pubmed.ncbi.nlm.nih.gov
  6. Hölmich P, Nyvold P, Larsen K. Continued significant effect of physical training as treatment for overuse injury: 8- to 12-year outcome of a randomized controlled trial. American Journal of Sports Medicine, 2011;39(11):2447–2451. pubmed.ncbi.nlm.nih.gov
  7. Serner A, Weir A, Tol JL, et al. Associations Between Initial Clinical Examination and Imaging Findings and Return-to-Sport in Male Athletes With Acute Adductor Injuries. American Journal of Sports Medicine, 2020;48(5):1151–1159. pubmed.ncbi.nlm.nih.gov
  8. Serner A, Hölmich P, Arnaiz J, et al. One-Year Clinical and Imaging Follow-up After Exercise-Based Treatment for Acute Complete Adductor Longus Tendon Avulsions in Athletes: A Prospective Case Series. American Journal of Sports Medicine, 2021;49(11):3004–3013. pubmed.ncbi.nlm.nih.gov
  9. Hölmich P, Larsen K, Krogsgaard K, Gluud C. Exercise program for prevention of groin pain in football players: a cluster-randomized trial. Scandinavian Journal of Medicine & Science in Sports, 2010;20(6):814–821. pubmed.ncbi.nlm.nih.gov
  10. Harøy J, Clarsen B, Wiger EG, et al. The Adductor Strengthening Programme prevents groin problems among male football players: a cluster-randomised controlled trial. British Journal of Sports Medicine, 2019;53(3):150–157. pubmed.ncbi.nlm.nih.gov
  11. Ishøi L, Sørensen CN, Kaae NM, Jørgensen LB, Hölmich P, Serner A. Large eccentric strength increase using the Copenhagen Adduction exercise in football: A randomized controlled trial. Scandinavian Journal of Medicine & Science in Sports, 2016;26(11):1334–1342. pubmed.ncbi.nlm.nih.gov
  12. Gasparin GB, Ribas LO, Flores HN, et al. Uncovering injuries in Brazilian elite women's football: A prospective cohort study. Journal of Science and Medicine in Sport, 2024;27(4):228–233. pubmed.ncbi.nlm.nih.gov