Quick answer: A distal biceps tear is a rupture of the tendon that attaches the biceps to the forearm bone just below the elbow. It typically happens with a sudden "pop" while lifting a heavy load. Without repair, most people keep reasonable function but lose a meaningful amount of strength, especially when turning the palm up [1, 2]. For active people, early surgical repair is usually recommended because it restores more strength [1, 3], and repair is ideally done within the first 2 to 3 weeks [4]. That makes a prompt evaluation important.
What Happens in a Distal Biceps Tear?
The biceps muscle has two jobs at the elbow: bending it (flexion) and rotating the forearm so the palm faces up (supination). The distal biceps tendon anchors the muscle to a bump on the radius bone called the radial tuberosity. When the tendon tears away from that bone, the muscle loses its attachment and often retracts up the arm [4].
Who Gets It?
Distal biceps tears are uncommon but not rare, at about 2.5 per 100,000 people per year in the U.S. The vast majority, about 95%, occur in men, with an average age in the mid-40s [5]. The typical mechanism is a heavy load forcing a bent elbow straight, such as catching a falling object or lifting furniture [6]. Smoking is a major risk factor: smokers had a 7.5-fold higher risk in one study [6]. Higher body mass index has also been linked to increased risk [5].
Symptoms
- A sudden pop at the front of the elbow during lifting
- Pain, swelling, and bruising at the front of the elbow and forearm
- Weakness, especially when turning a doorknob or screwdriver
- A change in the shape of the biceps, often called a "Popeye" appearance, as the muscle retracts
How Is It Diagnosed?
Diagnosis starts with the history and exam. The "hook test" is a simple exam maneuver in which the surgeon tries to hook a finger under the tendon at the front of the elbow. In one study, it correctly identified every complete tear and every intact tendon, outperforming MRI [7]. An MRI is still useful to confirm partial tears, measure how far the tendon has retracted, and plan surgery.
Do I Need Surgery?
What happens without surgery
Nonsurgical treatment is a reasonable option for some patients, particularly those who are less active or have medical reasons to avoid surgery. In a classic study, patients treated without surgery lost on average about 40% of their supination strength and about 30% of their elbow-flexion strength [1]. A more recent study found that patients treated without surgery still had satisfactory function overall, but with clearly reduced supination strength compared with patients who had repairs [2].
What surgery achieves
Immediate reattachment of the tendon to the bone restored normal flexion and supination strength at one year [1]. For healthy, active people, early surgical repair is generally recommended because it restores more strength, particularly in rotation [3].
Why timing matters
Once the tendon tears, it can retract and scar over the following weeks. The AAOS notes that repair is ideally performed within the first 2 to 3 weeks after injury, and that a direct repair becomes more difficult after about 6 weeks [4]. That's why it's best to be evaluated promptly.
What Does Surgery Involve?
The tendon is reattached to the radial tuberosity through either one incision at the front of the elbow or two incisions (front and back). In a randomized trial, both techniques produced similar function at two years. The single-incision approach had more temporary numbness of a skin nerve on the forearm, while the two-incision approach had a small advantage in final flexion strength [8].
Recovery
Current rehabilitation favors an early return to motion and daily activities [3], with strengthening introduced gradually over the following months. Return to heavy lifting is typically several months after surgery. Your surgeon will tailor the timeline to your repair and your work or sport.
Frequently Asked Questions
Is a distal biceps tear an emergency?
It isn't a surgical emergency, but it is time-sensitive. Getting evaluated within days to a couple of weeks keeps all treatment options open.
Can a partial tear heal on its own?
Some partial tears improve with rest, activity modification, and therapy. Persistent pain or weakness may need surgical treatment.
Is this the same as a biceps tear at the shoulder?
No. Tears of the biceps tendon at the shoulder (the long head) are more common and usually cause less loss of function. Learn more about biceps tendon disorders.
Will quitting smoking help?
Smoking is strongly associated with distal biceps ruptures [6], and quitting generally supports tendon and wound healing after surgery.
Getting Evaluated
If you felt a pop at the front of your elbow while lifting, an early evaluation helps ensure the best options are still available. Dr. Tej Joshi treats distal biceps tears at NYU Langone offices in Manhattan, Lake Success, and Bay Ridge, Brooklyn.
References
- Morrey BF, Askew LJ, An KN, Dobyns JH. Rupture of the distal tendon of the biceps brachii. A biomechanical study. J Bone Joint Surg Am. 1985;67(3):418-421. PubMed 3972866
- Freeman CR, McCormick KR, Mahoney D, Baratz M, Lubahn JD. Nonoperative treatment of distal biceps tendon ruptures compared with a historical control group. J Bone Joint Surg Am. 2009;91(10):2329-2334. PubMed 19797566 · doi:10.2106/JBJS.H.01150
- Sutton KM, Dodds SD, Ahmad CS, Sethi PM. Surgical treatment of distal biceps rupture. J Am Acad Orthop Surg. 2010;18(3):139-148. PubMed 20190104 · doi:10.5435/00124635-201003000-00003
- American Academy of Orthopaedic Surgeons. Biceps Tendon Tear at the Elbow. OrthoInfo. orthoinfo.org
- Kelly MP, Perkinson SG, Ablove RH, Tueting JL. Distal biceps tendon ruptures: an epidemiological analysis using a large population database. Am J Sports Med. 2015;43(8):2012-2017. PubMed 26063401 · doi:10.1177/0363546515587738
- Safran MR, Graham SM. Distal biceps tendon ruptures: incidence, demographics, and the effect of smoking. Clin Orthop Relat Res. 2002;(404):275-283. PubMed 12439270
- O'Driscoll SW, Goncalves LB, Dietz P. The hook test for distal biceps tendon avulsion. Am J Sports Med. 2007;35(11):1865-1869. PubMed 17687121 · doi:10.1177/0363546507305016
- Grewal R, Athwal GS, MacDermid JC, et al. Single versus double-incision technique for the repair of acute distal biceps tendon ruptures: a randomized clinical trial. J Bone Joint Surg Am. 2012;94(13):1166-1174. PubMed 22760383 · doi:10.2106/JBJS.K.00436