A Holstein-Lewis fracture is a spiral break in the lower third of the humerus, the long bone of the upper arm, and it is clinically significant because it carries a much higher risk of radial nerve injury than other humeral shaft fractures. In one large series, about 22 percent of patients with this fracture pattern presented with acute radial nerve palsy, compared with roughly 8 percent for humeral shaft fractures in general.1Journal of Orthopaedic Trauma. The Holstein-Lewis Humeral Shaft Fracture: Aspects of Radial Nerve Injury, Primary Treatment, and Outcome That connection between the fracture’s anatomy and the nerve running alongside it is what makes this injury distinct and dictates most of the decisions around treatment.
What Makes This Fracture Different
The humerus is the bone connecting the shoulder to the elbow. For most of its length, the radial nerve travels along a groove on the back of the bone, safely cushioned by muscle. But in the lower third of the shaft, the nerve pierces through the lateral intermuscular septum, a sheet of connective tissue that separates the muscle compartments of the arm. At that transition point, the nerve is essentially tethered. When a spiral fracture occurs right there, the sharp edges of the broken bone can trap, stretch, or compress the nerve against the septum. The result is radial nerve palsy, a condition where the nerve stops transmitting signals properly, leading to a characteristic wrist drop and difficulty extending the fingers and thumb.
The fracture pattern itself, a spiral line running through the distal third of the humerus shaft, accounts for about 7.5 percent of all humeral shaft fractures.2Journal of Orthopaedic Trauma. The Holstein-Lewis Humeral Shaft Fracture: Aspects of Radial Nerve Injury, Primary Treatment, and Outcome The name comes from the surgeons Arthur Holstein and Gruner Lewis, who first described the specific relationship between this fracture geometry and radial nerve entrapment. It is not a rare injury, but it is one that demands immediate attention to nerve function because missing the diagnosis can delay treatment and worsen outcomes.
How the Radial Nerve Gets Injured
When the humerus breaks in a spiral pattern at the distal third, the proximal fragment (the piece closer to the shoulder) tends to rotate outward. That rotation can pull the radial nerve into the fracture gap. Because the nerve is anchored by the lateral intermuscular septum just a short distance away, it cannot simply slide out of the way. The bone fragment essentially catches the nerve like a clothesline snagging on a fence post.
The nerve injury can range from a mild stretch, called a neurapraxia, where the nerve is bruised but structurally intact, to a more serious disruption where the nerve fibers are damaged or even torn. In neurapraxia, recovery typically happens on its own over weeks to months as the nerve heals. In more severe injuries, the nerve may need surgical decompression or repair. The challenge for clinicians is figuring out early on how badly the nerve is hurt, which is not always obvious from the initial exam alone.
The debate around when to explore the nerve surgically in these fractures has gone on for decades.3PubMed Central. Integrated Physical Therapy in a Unique Case of Holstein-Lewis Fracture With Radial Palsy: A Case Report Some surgeons argue that because the Holstein-Lewis pattern so often traps the nerve mechanically, early surgical exploration is warranted whenever nerve palsy is present at the time of injury. Others prefer a period of watchful waiting, reasoning that many palsies are neurapraxic and will resolve without surgery. The current consensus leans toward operative treatment for this specific fracture pattern, particularly when nerve symptoms are present from the outset, because the likelihood of mechanical entrapment is high enough to justify opening the fracture site rather than hoping the nerve frees itself.
Recognizing the Injury
A person with a Holstein-Lewis fracture typically presents after a fall or twisting injury to the arm. The arm is painful and swollen, and the patient cannot bear to move it, which is standard for any humeral shaft fracture. What separates this injury clinically is the nerve exam. A wrist drop, where the hand hangs limply when the forearm is held parallel to the ground, is the most obvious sign. The patient also cannot extend the fingers at the knuckle joints or straighten the thumb. Sensation may be diminished on the back of the hand between the thumb and index finger.
Standard X-rays usually show the characteristic spiral fracture in the distal third of the humerus clearly enough to raise suspicion for a Holstein-Lewis pattern. In recent years, ultrasound has emerged as a useful tool for directly visualizing the radial nerve before surgery. It can show the nerve’s position relative to the fracture fragments and identify swelling, compression, or loss of continuity in the nerve itself.4PubMed Central. Ultrasound-guided preoperative localization of radial nerve in the treatment of extra-articular distal humeral shaft fractures This is helpful for surgical planning because the surgeon can map the nerve’s location in advance, reducing the risk of accidentally injuring it further during the operation.
Electrodiagnostic testing, which measures the electrical activity in muscles and the speed at which nerves conduct signals, can help distinguish a mild bruise from more serious nerve damage. However, these tests are most informative when performed a few weeks after the injury, because it takes time for the measurable changes in nerve conduction to develop. In the acute setting, the physical exam remains the primary tool.
Surgery Versus Conservative Treatment in Adults
For humeral shaft fractures in general, there has long been a reasonable case for nonsurgical treatment. Functional bracing, where the arm is supported in a hinged sleeve that allows gradual movement, has been a standard approach for decades, and it works well for many patients. However, bracing carries nonunion rates that can reach as high as 25 percent, meaning the bone fails to heal and eventually requires surgery anyway.5PubMed Central. An Acta Orthopaedica educational article: Treatment of adult patients with a humeral shaft fracture Surgery offers faster early recovery and lower nonunion rates, though long-term outcomes between the two approaches tend to converge when bracing is successful.
For the Holstein-Lewis fracture specifically, the calculus shifts toward surgery more strongly than for other humeral shaft fractures. The primary reason is the trapped radial nerve. If the nerve is caught between the fracture fragments, no amount of bracing will free it. Open reduction and internal fixation, where the surgeon directly realigns the bone fragments and secures them with hardware, allows simultaneous exploration of the nerve.6PubMed Central. Integrated Physical Therapy in a Unique Case of Holstein-Lewis Fracture With Radial Palsy: A Case Report The surgeon can see whether the nerve is simply bruised, compressed by a bone fragment, or actually torn, and address the problem directly. This dual benefit of fixing both the fracture and the nerve issue in one procedure is why operative treatment is generally recommended when radial nerve palsy accompanies this fracture type.
Plates Versus Nails for Humeral Shaft Fractures
When surgery is chosen, the two main options for stabilizing a humeral shaft fracture are compression plating and intramedullary nailing. Plating involves placing a metal plate along the outside of the bone and screwing it into the fragments above and below the break. Nailing involves inserting a metal rod down the hollow center of the bone, usually entering through the shoulder.
The evidence comparing the two is fairly consistent across multiple analyses. One meta-analysis found that nailing and plating achieve similar rates of fracture union and have comparable risks of infection. However, plating came with a lower risk of reoperation, reducing it by about 74 percent compared with nailing, and it also resulted in fewer shoulder problems.7Acta Orthopaedica. Compression plating versus intramedullary nailing of humeral shaft fractures—a meta-analysis In practical terms, roughly one reoperation could be prevented for every ten patients treated with plates instead of nails.
Another systematic review confirmed those patterns, finding that intramedullary nailing was associated with more shoulder impingement, greater restriction of shoulder movement, a higher incidence of implant failure, and more reoperations.8PLOS ONE. Intramedullary Nail versus Dynamic Compression Plate Fixation in Treating Humeral Shaft Fractures: Grading the Evidence through a Meta-Analysis The shoulder issues make sense when you consider the entry point for the nail. Driving a rod through the top of the humerus necessarily disrupts the rotator cuff or its surrounding tissues, which can lead to pain and stiffness afterward.
One finding that stands out relates directly to the nerve concern that defines the Holstein-Lewis fracture. A separate systematic review reported that the incidence of post-operative radial nerve palsy was about 11 percent in the plating group, compared with zero in the nailing group.9PubMed Central. Intramedullary Nailing Versus Plate Fixation for Humeral Shaft Fractures: A Systematic Review and Meta-Analysis That may seem paradoxical for a fracture where protecting the nerve is the whole point of operating. The explanation is straightforward: plating requires exposing the bone directly, and the radial nerve runs right across the surgical field in the distal humerus. The nerve can be stretched, compressed by retractors, or even cut during the procedure if the surgeon is not meticulous. Nailing, because it happens inside the bone, avoids direct contact with the nerve entirely. Still, plating remains the preferred technique for Holstein-Lewis fractures when nerve exploration is needed, because you cannot free a trapped nerve without actually seeing it.
Why Children Are Different
One of the more surprising findings in the orthopedic literature is that Holstein-Lewis fractures behave quite differently in children compared with adults. A study of pediatric patients with the same spiral distal-third fracture pattern found that none of the children or adolescents presented with radial nerve palsy, despite having the identical fracture geometry that produces palsy in roughly one in five adults.10Journal of Pediatric Orthopaedics B. The Holstein–Lewis humerus shaft fracture in children: are they different from adults?
The treatment implications follow logically from that finding. In the study, about 87 percent of the pediatric patients were successfully treated with closed, nonsurgical methods like casting or bracing. The average age of those treated conservatively was around ten years. The small group that required surgery, about 13 percent, tended to be older adolescents with an average age around fifteen. Why the nerve is spared in younger patients is not entirely clear, but it likely relates to the greater elasticity of pediatric tissues, including the nerve itself and the surrounding soft tissue structures. A child’s periosteum, the tough membrane surrounding the bone, is also thicker and more pliable, which may cushion the nerve during the fracture event. Whatever the explanation, the practical takeaway is significant: the urgency to operate and explore the nerve that applies in adults does not automatically extend to children.
Rehabilitation After a Holstein-Lewis Fracture
Whether the fracture is managed with surgery or, in cases without nerve injury, with bracing, rehabilitation plays a central role in recovery. The arm has typically been immobilized for some period, and the muscles weaken quickly. For patients who also have radial nerve palsy, rehab becomes even more important because they are dealing with two problems at once: a healing bone and a recovering nerve.
Physical therapy after surgical fixation usually begins with gentle range-of-motion exercises for the shoulder, elbow, and wrist within the first week or two, depending on how stable the fixation is. The shoulder is particularly vulnerable to stiffness after humeral fractures, and early movement helps prevent a frozen shoulder from developing on top of everything else. For patients with nerve palsy, a wrist splint that holds the hand in a functional position prevents the wrist from drooping and keeps the finger tendons from tightening up while the nerve recovers. One case report documented a 20-year-old man who underwent open reduction and internal fixation for a Holstein-Lewis fracture with radial nerve palsy and was referred to physical therapy afterward, illustrating the integrated approach that modern treatment protocols emphasize.11PubMed Central. Integrated Physical Therapy in a Unique Case of Holstein-Lewis Fracture With Radial Palsy: A Case Report
Nerve recovery is typically the slower process. A mild neurapraxia might recover in six to twelve weeks, while a more severe nerve injury can take many months. During that waiting period, electrical stimulation and targeted exercises help maintain muscle bulk and joint mobility. Patients are often anxious about wrist drop and the inability to extend their fingers, so setting realistic expectations about the timeline is an important part of care. Most nerve palsies associated with humeral shaft fractures do recover, but the path can be long and uneven.
Nonunion and Other Complications
Beyond the radial nerve, the other major concern with humeral shaft fractures is nonunion, where the bone fails to knit back together. As mentioned earlier, functional bracing carries nonunion rates that can reach 25 percent.12PubMed Central. An Acta Orthopaedica educational article: Treatment of adult patients with a humeral shaft fracture Surgical fixation lowers that rate considerably, though the exact numbers depend on the technique and the patient’s health. Nonunion is more than a radiographic curiosity; it is frequently symptomatic, causing persistent pain and arm weakness that significantly affects daily activities. When nonunion does occur, it is most often managed with compression plating, which provides rigid stability and fresh bone stimulation to encourage healing.
Infection is another potential complication of surgical treatment, though it occurs at relatively low rates with both plating and nailing techniques. Hardware failure, where the plate bends or the screws loosen, is uncommon with modern implants but can happen, particularly in patients with osteoporotic bone. Malunion, where the bone heals in an abnormal position, can alter arm length or rotation and occasionally requires corrective surgery. These complications are not unique to Holstein-Lewis fractures but are part of the broader landscape of humeral shaft fracture management.
Ultrasound-Guided Nerve Localization
One of the more practical advances in managing distal humeral shaft fractures has been the use of ultrasound to locate the radial nerve before surgery. Over the past decade, ultrasound has become increasingly popular in musculoskeletal assessment because it is relatively inexpensive, noninvasive, and can be performed at the bedside or in the clinic without the radiation exposure of CT scanning.13PubMed Central. Ultrasound-guided preoperative localization of radial nerve in the treatment of extra-articular distal humeral shaft fractures For a Holstein-Lewis fracture, where the whole concern is the nerve’s proximity to sharp bone fragments, knowing exactly where the nerve sits before making the incision is genuinely valuable.
The surgeon or radiologist scans the arm with a high-frequency probe and can typically identify the radial nerve as a distinct structure, noting its relationship to the fracture fragments. They can also assess whether the nerve appears swollen, compressed, or disrupted. This information allows the surgical approach to be tailored: the incision can be planned to approach the fracture from a direction that minimizes the risk of damaging the nerve during exposure, and the surgeon knows in advance whether the nerve is displaced into an unusual position. While ultrasound does not replace the direct inspection that happens during surgery, it reduces surprises and shortens the time the nerve spends exposed during the operation.
When to Worry and When Not To
If you or someone you know breaks the upper arm and a doctor mentions a spiral fracture in the lower part of the humerus, the first thing to pay attention to is nerve function. Can you extend your wrist? Can you straighten your fingers? Is there any numbness on the back of your hand? These simple tests tell the treating physician whether the radial nerve is involved and help determine how urgently the fracture needs to be taken to surgery.
Not every Holstein-Lewis fracture comes with nerve palsy. About 78 percent of patients in the large series cited earlier had intact nerve function, and many of those patients can be treated either with bracing or with surgical fixation chosen purely for the fracture itself, without the added urgency of nerve exploration. The fracture pattern alone does not mandate surgery; it is the combination of the fracture pattern and nerve involvement that tips the balance so decisively toward operative treatment.
For parents of children with this fracture, the evidence is genuinely reassuring. The absence of radial nerve palsy in pediatric Holstein-Lewis fractures means that the aggressive surgical approach recommended for adults is usually unnecessary.14Journal of Pediatric Orthopaedics B. The Holstein–Lewis humerus shaft fracture in children: are they different from adults? Most children heal well with casting or bracing alone, and the vast majority do not need an operation. That said, older adolescents, particularly those approaching skeletal maturity around age fifteen or sixteen, may behave more like adults in terms of fracture behavior and should be evaluated accordingly.