On Sunday, September 20, 2026, I finished second in my technical preliminary heat at the USA SUP National Championships in Gig Harbor, Washington, in 5:18.58. In the finishing sprint of that run, going all out for the line, my right arm cramped, spasmed and then turned painful.
Arjun, an emergency room physician, and Carl, a nurse practitioner, were on the event medical team. They taped, wrapped and splinted the arm, put it in a sling, and warned that another run risked turning an injury that would heal into one that needed surgery.
I dropped out of the final. The results from all three days are in my USA SUP Nationals race report.
Three days later I have a normal X-ray and no diagnosis. The orthopedic exam comes next.
Key Takeaways
- The injury: acute right elbow pain in the finishing sprint of a technical race at USA SUP Nationals on September 20, 2026. No pop, no bruising, and pain at the front, back, inside and outside of the elbow.
- On-site care: kinesiology tape, an elastic compression wrap, a rigid splint and a sling from the event medical team.
- X-ray result: three views on September 21, 2026, read as a normal right elbow. For a distal biceps rupture, plain radiographs “are usually unrevealing” (Taylor and Hannafin, Sports Health, 2012).
- The hook test was abnormal in 33 of 33 complete distal biceps avulsions and intact in 12 of 12 partial ones, beating MRI on both sensitivity and specificity (O’Driscoll et al., 2007).
- Repair timing: peer-reviewed windows for repairing a complete distal bicep tear run from 3 to 4 weeks (Taylor and Hannafin, 2012) to a consensus “acute” cutoff of under 6 weeks (Flint et al., 2014).
- SUP injury data: the shoulder and upper arm account for 32.9% of stand-up paddleboarding injuries and the elbow and forearm 11.8%, with competitive status and racing among the risk factors (Furness et al., 2017).
- Stroke mechanics: experienced paddlers reached a minimum elbow flexion of 6.0 degrees against 24.8 degrees for inexperienced paddlers, who leaned more on the biceps and forearm (Schram et al., 2019).
Medical disclaimer: I am a paddler writing about my own injury. Every clinical figure here comes from a peer-reviewed paper, listed under Studies Cited. None of it is a diagnosis or medical advice. If your elbow hurts after a hard effort, see a physician.
What the Injury Felt Like
There was no pop. The pain covered the front of the elbow and the back of it, on both the inside and the outside. Three days on there is still no bruising, and it hurts to bend the elbow and to straighten it.
Taylor and Hannafin, reviewing elbow tendon injuries in Sports Health in 2012, describe a complete distal biceps rupture this way: patients “often describe a sharp, sudden, and painful ‘pop,'” ecchymosis, the medical word for bruising, “is present acutely,” and complete ruptures “usually have a visible deformity resulting from biceps muscle retraction proximally.”
The medical team at the race still treated the arm as a possible tear.
Schwellnus, in a 1999 review in The Physician and Sportsmedicine, defines exercise cramps as “painful, involuntary contractions of skeletal muscle that occur during or immediately after exercise,” and lists muscle fatigue as a risk factor, “particularly when a muscle contracts in a shortened position.”
A 2022 evidence review by Miller and colleagues in the Journal of Athletic Training traces them to “a confluence of unique intrinsic and extrinsic factors rather than a singular cause.”
The Splint, the Wrap and the Sling
The medical team built the support in layers: pink kinesiology tape across the front of the elbow, a rigid splint under the forearm and upper arm, an elastic wrap holding both, and a sling tied at my chest. The elbow sits bent inside it.
I spent the rest of Sunday in the splint and sling.
I am right-handed. On Wednesday, September 23, I ate dinner with chopsticks in my left hand.
A Normal X-Ray on Day Two
On Monday, September 21, my primary care physician saw me by phone. Orthopedics wanted X-rays before an appointment, so I had three views of the right elbow taken that day.
The impression reads “Normal right elbow,” with no acute fracture or dislocation, no significant joint effusion and no significant arthritis.
An X-ray images bone. For a distal biceps rupture, Taylor and Hannafin write, “plain radiographs are usually unrevealing but can be useful if the mechanism or examination suggests concomitant injuries.”
How a Tendon Tear Gets Found
The hook test is done by hand. With the elbow bent to 90 degrees and the patient actively turning the palm up, the examiner tries to hook an index finger under the biceps tendon from the outside of the elbow. O’Driscoll, Goncalves and Dietz ran it on 45 patients who then had surgical exploration, reported in the American Journal of Sports Medicine in 2007. The test was abnormal in 33 of 33 complete avulsions and intact in 12 of 12 partial detachments, though it was painful in 9 of those 12.
MRI scored lower in the same study, at 92% sensitivity and 85% specificity against 100% for both on the hook test. It read 11 of the 12 partial tears as complete.
What the Elbow Injury Could Be
The medical team at the race raised three possibilities: a torn ligament around the elbow, a tear in the biceps region, or a torn muscle.
A Distal Bicep Tear
The biceps inserts into the radius at the radial tuberosity, just below the elbow. Jaschke and colleagues, in a 2023 overview in EFORT Open Reviews, give the main function of the biceps as “flexion and supination of the forearm,” supination being the palm-up turn, and add that “the short head contributes to a greater flexion force and the long head to a greater supination force.”
Taylor and Hannafin call rupture “classically an acute injury occurring during placement of a large eccentric load,” typically in “the dominant arm of men between the ages of 40 and 50 years.”
Kelly and colleagues, working from a large United States population database in 2015, put the national incidence at 2.55 per 100,000 patient-years, with a mean age of 46.3 and men making up 95% of cases. Safran and Graham found a 7.5 times greater risk in smokers in a 2002 study in Clinical Orthopaedics and Related Research.
A Brachialis Tear
Schönberger and Ernst reported a 45-year-old man in the International Journal of Emergency Medicine in 2011 who felt “a sudden snap” in his elbow lifting a motorcycle.
His radiographs “revealed no fracture, dislocation or elbow joint effusion,” and “the biceps and triceps brachii tendons were intact.” Ultrasound found a rupture of the brachialis, caused by “resisted flexion and pronation of the lower arm.” Passive extension and resisted flexion both increased his pain on the inside of the elbow. He reached “near-normal function and strength” 10 weeks later.
The authors found only five traumatic brachialis ruptures described in the previous 20 years.
A Ligament or Tendon Strain on the Inside of the Elbow
The ulnar collateral ligament and the flexor-pronator tendons both sit on the inside of the elbow. Wilk and colleagues, writing in the International Journal of Sports Physical Therapy in 2026, note that “often the differential diagnosis between UCL injuries and flexor/pronator tendinitis is difficult for the clinician.” Their paper covers overhead throwing athletes.
Repair Windows and Strength Loss
Complete ruptures “should be addressed with primary repair within 3 to 4 weeks of injury,” according to Taylor and Hannafin, and “delay increases the technical difficulty of the repair secondary to scar formation and tendon retraction.” A 2014 systematic review of 116 articles by Flint and colleagues in the American Journal of Sports Medicine found the consensus definition of an acute distal biceps rupture to be under 6 weeks, and chronic over 12. Dillon and colleagues, in Hand in 2011, repaired 9 ruptures more than 4 weeks old without a graft and found “no significant difference in function or strength” against the acute repairs.
“Incomplete tears (< 50%) can be managed conservatively with splint immobilization for 4 weeks in 30° of flexion,” Taylor and Hannafin write.
Leaving a complete rupture unrepaired costs strength, mostly in turning the palm up:
| Study | Who | Supination strength | Flexion strength |
|---|---|---|---|
| Morrey et al., 1985, JBJS Am | 3 patients treated without surgery | Mean loss of 40% | Variable, averaging a 30% loss |
| Freeman et al., 2009, JBJS Am | 20 unrepaired ruptures in 18 patients, median follow-up 38 months | Median 63% of the uninjured arm, against 92% after surgery | Median 93%, against 95% after surgery |
| Looney et al., 2022, J Shoulder Elbow Surg | Meta-analysis of 62 studies, 2,481 cases | 27.56% higher with surgery | 25.67% higher with surgery |
After surgery, Jaschke and colleagues lay out rehab in phases: acute recovery through week 6, intermediate work from week 6 to 12, advanced strengthening from week 12 to 16, and return of the preferred movement after 16 weeks. In a 2022 review, Carrazana-Suarez, Cooke and Schmidt report that 84% to 94% of NFL players returned to play at least one game after distal biceps repair.
What the Paddle Stroke Asks of an Elbow
Furness and colleagues surveyed 240 stand-up paddlers for a 2017 study in the Orthopaedic Journal of Sports Medicine and recorded 161 injuries, a rate of 3.63 per 1,000 hours on the board. The shoulder and upper arm took 32.9% of injuries and the elbow and forearm 11.8%. Muscle and tendon injuries made up 50.4% of the total.
The risk factors they identified were age over 46, competitive status, more than 4.8 hours a week on the board, and racing.
Schram and colleagues measured the stroke on a paddling ergometer for a 2019 study in PeerJ. The 7 experienced paddlers reached a minimum elbow flexion of 6.0 degrees, keeping the arm close to straight, against 24.8 degrees for the 19 inexperienced ones. The inexperienced group tended “to rely heavily on the shoulder and possibly the biceps and forearm musculature to generate force during the entry and drive phases.”
The isometric holds I built for tendon tolerance cover the elbow and shoulder, and grip pressure on the shaft covers the forearm. For the racing side, my first paddle board race guide starts from the beginning.
Questions for the Orthopedist
Natalya Shoror, LMT, who raced the 5K at Nationals, helped me think through how to advocate for myself once I got care back home. I am taking these questions to the orthopedic exam:
- Which structure is injured: the distal biceps tendon, the brachialis, a collateral ligament or the forearm tendons?
- Is the distal biceps tendon intact, and what does the hook test show?
- Could a partial tear be there despite the normal X-ray?
- Do I need an MRI or an ultrasound?
- How long do the splint and sling stay on, and when does physical therapy start?
- What range of motion and strength clear me for easy paddling, then intervals, then sprinting and racing?
- If it is a tear, how long is the repair window?
Frequently Asked Questions
What does a distal bicep tear feel like?
Patients with a complete distal biceps rupture “often describe a sharp, sudden, and painful ‘pop,'” according to a 2012 review in Sports Health. Bruising is present early, and a complete rupture usually leaves a visible deformity as the biceps muscle pulls up the arm. My own injury came on as a cramp and spasm in a race sprint, with no pop and no bruising.
Can an X-ray show a torn bicep tendon?
Usually not. Taylor and Hannafin write that for distal biceps ruptures “plain radiographs are usually unrevealing,” though they help when a fracture or other bony injury is suspected. Diagnosis rests on the physical exam and, when needed, MRI or ultrasound.
What is the hook test for a bicep tear?
The examiner tries to hook an index finger under the biceps tendon from the outside of the elbow while the patient holds the elbow at 90 degrees and turns the palm up. In a 2007 study of 45 surgical patients, the test was abnormal in all 33 complete avulsions and intact in all 12 partial ones. Its sensitivity and specificity were both 100%, against 92% and 85% for MRI.
How soon does a distal bicep tear need surgery?
A 2012 review recommends repairing complete ruptures within 3 to 4 weeks, because delay adds scar tissue and tendon retraction. A 2014 systematic review found the consensus definition of an acute rupture to be under 6 weeks. A 2011 series of 9 repairs done after 4 weeks found no significant difference in function or strength compared with acute repairs.
Can a partial distal bicep tear heal without surgery?
Tears involving less than half the tendon can be managed conservatively, according to Taylor and Hannafin, with “splint immobilization for 4 weeks in 30° of flexion.” Jaschke and colleagues recommend surgery for tears involving more than half the tendon.
How much strength do you lose with an unrepaired distal bicep tear?
In a 2009 study of 20 unrepaired ruptures, supination strength was a median of 63% of the uninjured arm, against 92% for surgical patients, while flexion strength was 93% against 95%. A 2022 meta-analysis of 62 studies found surgery produced 27.56% more supination strength and 25.67% more flexion strength.
Who gets distal biceps tendon ruptures?
Men in their forties account for most cases. A 2015 United States population study found an incidence of 2.55 per 100,000 patient-years, a mean age of 46.3 and 95% of cases in men. A 2002 study found the dominant arm involved in 86% of patients and a 7.5 times greater risk in smokers.
How common are elbow injuries in stand-up paddleboarding?
The elbow and forearm accounted for 11.8% of injuries in a 2017 study of 240 stand-up paddlers, behind the shoulder and upper arm at 32.9% and the lower back at 14.3%. The overall rate was 3.63 injuries per 1,000 hours, and competitive paddling and racing were among the risk factors.
Is a muscle cramp the same as a muscle tear?
A cramp is a painful, involuntary contraction of skeletal muscle during or right after exercise, per a 1999 review in The Physician and Sportsmedicine. A tear is damage to the muscle or tendon itself. My arm cramped first in the race sprint, and the medical team then splinted it as a possible tear.
How long is recovery after distal bicep tendon repair?
A 2023 review in EFORT Open Reviews describes rehab running through an acute phase to week 6, intermediate work to week 12, advanced strengthening to week 16, and return of the preferred movement after 16 weeks. A 2022 review found 84% to 94% of NFL players returned to play at least one game after repair.
Studies Cited
- Carrazana-Suarez LF, Cooke S, Schmidt CC. Return to Play After Distal Biceps Tendon Repair. Curr Rev Musculoskelet Med. 2022. doi:10.1007/s12178-022-09742-x
- Dillon MT et al. Repair of acute and chronic distal biceps tendon ruptures using the EndoButton. Hand (N Y). 2011. doi:10.1007/s11552-010-9286-4
- Flint JH et al. Defining the terms acute and chronic in orthopaedic sports injuries: a systematic review. Am J Sports Med. 2014. doi:10.1177/0363546513490656
- Freeman CR et al. Nonoperative treatment of distal biceps tendon ruptures compared with a historical control group. J Bone Joint Surg Am. 2009. doi:10.2106/JBJS.H.01150
- Furness J, Olorunnife O, Schram B, Climstein M, Hing W. Epidemiology of Injuries in Stand-Up Paddle Boarding. Orthop J Sports Med. 2017. doi:10.1177/2325967117710759
- Jaschke M, Rekawek K, Sokolowski S, Kolodziej L. Distal biceps tendon rupture: a comprehensive overview. EFORT Open Rev. 2023. doi:10.1530/EOR-23-0035
- Kelly MP et al. Distal Biceps Tendon Ruptures: An Epidemiological Analysis Using a Large Population Database. Am J Sports Med. 2015. doi:10.1177/0363546515587738
- Looney AM et al. Operative vs. nonoperative treatment of distal biceps ruptures: a systematic review and meta-analysis. J Shoulder Elbow Surg. 2022. doi:10.1016/j.jse.2021.12.001
- Miller KC, McDermott BP, Yeargin SW, Fiol A, Schwellnus MP. An Evidence-Based Review of the Pathophysiology, Treatment, and Prevention of Exercise-Associated Muscle Cramps. J Athl Train. 2022. doi:10.4085/1062-6050-0696.20
- Morrey BF et al. Rupture of the distal tendon of the biceps brachii. A biomechanical study. J Bone Joint Surg Am. 1985. PMID 3972866
- O’Driscoll SW, Goncalves LB, Dietz P. The hook test for distal biceps tendon avulsion. Am J Sports Med. 2007. doi:10.1177/0363546507305016
- Safran MR, Graham SM. Distal biceps tendon ruptures: incidence, demographics, and the effect of smoking. Clin Orthop Relat Res. 2002. PMID 12439270
- Schönberger TJA, Ernst MF. A brachialis muscle rupture diagnosed by ultrasound; case report. Int J Emerg Med. 2011. doi:10.1186/1865-1380-4-46
- Schram B et al. A biomechanical analysis of the stand-up paddle board stroke: a comparative study. PeerJ. 2019. doi:10.7717/peerj.8006
- Schwellnus MP. Skeletal muscle cramps during exercise. Phys Sportsmed. 1999. doi:10.3810/psm.1999.11.1116
- Taylor SA, Hannafin JA. Evaluation and management of elbow tendinopathy. Sports Health. 2012. doi:10.1177/1941738112454651
- Wilk KE et al. Diagnostic Dilemma: Testing to Differentiate UCL Sprains From Flexor-Pronator Elbow Strains in the Overhead Athlete. Int J Sports Phys Ther. 2026. doi:10.26603/001c.147438
Article Updates
- September 24, 2026: Added three photos from September 23: the elbow out of the wrap, the wrap, splint and tape together, and eating left-handed.
- September 23, 2026: Article published three days after the injury, with the X-ray result. Diagnosis pending the orthopedic exam.
