Proximal Humerus Fracture Treatment and Recovery

A proximal humerus fracture is a break near the top of the upper arm bone, right where it forms the ball of the shoulder joint. It is one of the most common fractures in older adults, accounting for roughly 5 to 6 percent of all fractures, and the people most often affected are women over 70 with weakened bones. The injury can range from a hairline crack that heals well on its own to a shattered joint that requires a shoulder replacement. Understanding the fracture type, blood supply concerns, and your treatment options matters because the gap between the best and worst outcomes is wide, and much of it comes down to decisions made in the first days and weeks.

Who Gets These Fractures and Why

Proximal humerus fractures overwhelmingly affect older people, and women bear the brunt. In a large Medicare registry analysis covering over 47,000 fractures, about 80 percent occurred in women, and nearly half of all fractures struck people older than 80. The highest rates were in women aged 80 and above, reaching roughly 1,534 cases per 100,000 enrollees in a recent year.¹ A French trauma-center study found a two-to-one female-to-male ratio, with a mean patient age of 70.²

The typical mechanism is straightforward: a low-energy fall from standing height onto an outstretched arm, combined with bone weakened by osteoporosis. In younger adults and adolescents, the same fracture usually requires a high-energy event like a car crash, a sports collision, or a fall from height. The osteoporosis link is so strong that a proximal humerus fracture in someone over 50 should be treated as a signal that their skeleton may be fragile elsewhere too.

Why Blood Supply Is a Central Concern

The top of the humerus sits inside a joint capsule and relies on a surprisingly precarious blood supply. Most of the blood feeding the outer bone surface comes from the posterior circumflex humeral artery, which fans out across the greater tuberosity and the lateral portion of the bone. Fine connections link it with branches from the anterior circumflex artery, but those connections are delicate.³ When a fracture line runs through the lateral metaphyseal region, it can shear those vessels and leave bone fragments starved of blood. Imaging studies have confirmed that certain zones of the humeral head, particularly the upper and medial portions, are already poorly supplied even in healthy shoulders.⁴

When the blood supply is cut off, the humeral head can undergo avascular necrosis, meaning the bone dies and gradually collapses. This is one of the most feared complications of severe proximal humerus fractures and a major reason surgeons pay close attention to the fracture pattern. Fractures through the anatomical neck and those with tuberosity fragments displaced more than about 10 millimeters are significantly associated with avascular necrosis.⁵ Understanding this vascular anatomy is not just academic; it directly shapes which fractures can be fixed with hardware and which need the humeral head replaced entirely.

Getting the Diagnosis Right

Standard X-rays in two or three views are the first step and can identify most proximal humerus fractures. But X-rays have a well-documented weakness: they flatten a three-dimensional injury into a two-dimensional image, making it hard for doctors to agree on how many fragments exist and how badly they are displaced. CT scans significantly outperform plain X-rays in assessing the important structural details of the fracture, regardless of whether the break involves two, three, or four parts.⁶

In research settings, 3D-printed models of the fracture have been tested as a way to further improve agreement among surgeons about the fracture type. When surgeons classified fractures using 3D models, they agreed with each other more reliably than when using X-rays alone.⁷ For most patients, the practical takeaway is this: if your doctor is deciding between surgery and non-surgery, a CT scan is worth getting. The additional detail can change the treatment plan.

Conservative Treatment Works Better Than Many Expect

Perhaps the most surprising finding in proximal humerus fracture research is how often non-surgical treatment produces outcomes just as good as surgery. The landmark PROFHER trial randomized patients with displaced fractures involving the surgical neck to either surgery or sling-and-rehabilitation. At two years, there was no meaningful difference in shoulder function scores between the two groups.⁸ Crucially, this equivalence held up at five years, and no patient in either group needed additional shoulder surgery for a new complication during that extended follow-up period.⁹

A separate multicenter randomized trial focused on two-part fractures found the same thing: at two years, function scores, pain levels, and quality-of-life measures were virtually identical between the surgical and non-surgical groups.¹⁰ These results pushed back against a trend of increasing surgical rates and suggest that for many displaced fractures, a sling and a good physiotherapy program are the better path. That said, the trials primarily enrolled patients with surgical-neck fractures; they cannot be extrapolated wholesale to severely comminuted four-part fractures or fracture-dislocations, where the anatomy is more disrupted.

When Is Surgery the Right Call

Surgery enters the picture when the fracture pattern is too unstable or too displaced for bone to heal in a functional position on its own. Broadly, the surgical options break into three categories: internal fixation with plates and screws, fixation with an intramedullary nail inserted through the top of the bone, and joint replacement.

Locking plates are the most commonly used fixation device. They attach to the side of the bone and secure the fragments with screws that lock into the plate, preventing them from toggling loose. In clinical series, patients treated with locking plates for displaced fractures achieve forward arm elevation of roughly 130 to 140 degrees on average, which is close to normal.¹¹¹² Complications, however, are not rare. One series reported that about one in five shoulders experienced a complication after plate fixation, including screw penetration into the joint, loss of reduction, and avascular necrosis.¹³ Finite element studies suggest that using longer screws can reduce the risk of screw cut-out through weakened bone.¹⁴

Intramedullary nails offer an alternative. They are inserted through a small entry point at the top of the shoulder and slide down inside the hollow center of the bone, then locking screws pass through the nail into the fracture fragments. Systematic reviews and meta-analyses comparing nails to plates have found similar functional outcomes and fracture-healing rates.¹⁵ Nails tend to have shorter operating times and less blood loss, which is appealing in older or medically fragile patients.¹⁶ One potential drawback is that the nail’s entry point passes through the rotator cuff, which can cause shoulder impingement or stiffness in some patients. Some meta-analyses have found a higher rate of reoperation with nails, while others have not, so the evidence is mixed.¹⁷

Joint Replacement for the Worst Fractures

When the humeral head is split, severely displaced in multiple parts, or its blood supply is clearly destroyed, trying to fix the bone may be futile. In these cases, replacement of the joint is the best option. Two types of shoulder replacement are used: hemiarthroplasty, which replaces only the ball of the joint, and reverse total shoulder arthroplasty (RTSA), which flips the ball-and-socket mechanics so the socket side gets a ball and the humeral side gets a cup.

Head-to-head comparisons have consistently favored reverse arthroplasty. A randomized trial in patients aged 70 and older with three- and four-part fractures found that RTSA produced a mean Constant score about 11 points higher than hemiarthroplasty, along with significantly greater forward flexion (125 degrees versus 90 degrees) and higher patient satisfaction.¹⁸ Another comparative study showed that RTSA led to better function scores and a satisfaction rate of about 91 percent compared with 61 percent for hemiarthroplasty.¹⁹

The main tradeoff is that RTSA patients tend to recover less external rotation compared with hemiarthroplasty patients, because the reversed geometry changes how the remaining rotator cuff muscles work. An earlier systematic review reported average external rotation of about 20 degrees after RTSA versus 30 degrees after hemiarthroplasty.²⁰ For most daily tasks this limitation is manageable, but it is worth knowing about if activities like reaching behind your back or throwing matter to you.

The Cost Question

A health-technology assessment built into the PROFHER trial found that surgery cost on average about £1,780 more per patient than non-surgical care over two years, with no quality-of-life benefit. Only about 5 percent of simulations showed surgery meeting a standard cost-effectiveness threshold.²¹ That analysis compared fixation surgery against conservative care for displaced surgical-neck fractures. For the complex fractures where arthroplasty is being considered, the economics look different. A cost-utility analysis found that RTSA was the most cost-effective option across time horizons ranging from two to ten years, outperforming both hemiarthroplasty and open fixation in terms of quality-adjusted life-years gained relative to cost.²² The takeaway is not that surgery is always wasteful or always worthwhile; it depends entirely on the fracture pattern and the patient.

Nerve Injuries Are More Common Than You Would Think

The nerves running around the shoulder joint are vulnerable during proximal humerus fractures, and the injury rate is far higher than most patients realize. An electromyography study of 143 patients found nerve damage in about two-thirds of all cases. The axillary nerve, which controls the deltoid muscle responsible for lifting the arm, was affected in 58 percent of patients, and the suprascapular nerve, which powers key rotator cuff muscles, was damaged in 48 percent. Multiple nerves were often injured at once. Displaced fractures carried even higher rates, with nerve damage in over 80 percent of cases.²³

Most of these injuries are stretch-type (neurapraxia) rather than full nerve tears, which means the majority recover on their own over weeks to months. Still, nerve involvement can slow rehabilitation, limit initial muscle activation, and occasionally leave lasting weakness. If you notice numbness on the outer shoulder (the “regimental badge” area) or difficulty raising your arm beyond what the fracture pain would explain, mention it to your doctor. Early recognition matters because it adjusts the rehabilitation timeline and expectations.

Rehabilitation and Early Movement

The rehabilitation phase after a proximal humerus fracture follows a reasonably predictable sequence, whether the fracture was treated with or without surgery. A systematic review of rehabilitation protocols found a common progression: sling use typically lasting about three weeks, gentle pendulum exercises starting within the first day or two, passive range-of-motion exercises beginning around day two, active-assisted movement starting at roughly three weeks, unrestricted motion by four to six weeks, and strengthening exercises at about six weeks.²⁴

A natural question is whether starting movement early risks displacing the fracture. A meta-analysis of six randomized trials comparing early mobilization (within one week) to delayed mobilization (after three to four weeks of immobilization) found no significant increase in secondary fracture displacement or total complications with early movement. The one advantage of early mobilization was a small but significant improvement in function scores at three months, though by six and twelve months the groups looked similar.²⁵ A study of conservatively managed patients who followed a home-based exercise program confirmed this pattern, showing that the fracture fragments actually settled toward more anatomic alignment over time, and functional scores at one year were satisfactory.²⁶

Virtual-reality-based rehabilitation has also been tested as a supplement to standard physiotherapy. In a randomized trial, patients who added virtual rehabilitation sessions to conventional therapy had greater improvements in range of motion, muscle strength, and disability scores compared with those doing conventional therapy alone.²⁷ This is still an emerging area, but it suggests that engaging, interactive rehab approaches can help patients push through the tedious middle stages of recovery.

What Predicts a Good or Poor Outcome

Patients naturally want to know how their shoulder will feel a year from now. Predicting individual outcomes turns out to be harder than expected. A secondary analysis of two randomized trials tried to build prediction models for function scores at two years. The strongest predictor for two of the three scoring tools was not fracture severity or treatment type but how frequently the patient experienced dizziness, followed by body mass index. Whether the dominant arm was injured mattered most for the third score. Even using all available predictors, the models explained only about 40 percent of the variation in outcomes.²⁸ The interaction between the predicted outcome and whether surgery or non-surgery was chosen was small and uncertain, reinforcing that the treatment method alone does not determine how you end up feeling.

Abduction strength, the ability to lift the arm away from the body, was found to be a significant predictor of patient-reported function across multiple scoring tools.²⁹ This makes intuitive sense: many daily activities, from reaching a shelf to getting dressed, demand the ability to lift and hold the arm away from the trunk. Focused rehabilitation targeting that movement pattern may carry outsized importance.

Bone Health After the Fracture

A proximal humerus fracture in an older adult is a red flag for osteoporosis, yet follow-through on bone health is remarkably poor. A study of over 1,700 geriatric patients who sustained a proximal humerus fracture found that 76 percent were never prescribed any anti-osteoporosis medication. Only about 3 percent of previously untreated patients were started on therapy in the year after their fracture.³⁰

This matters because treatment makes a measurable difference. Patients who underwent bone density screening had a substantially lower hazard of sustaining a future proximal humerus fracture, and those treated with osteoporosis medication also had significantly reduced fracture risk compared with untreated controls.³¹ A large registry study found that about one in five older patients who fractured their proximal humerus went on to sustain at least one secondary fracture, and anti-osteoporosis therapy significantly reduced that risk. Male patients, who are less likely to be prescribed these medications, showed the strongest benefit when they did receive treatment.³² If you or a family member breaks a proximal humerus after age 50 and nobody brings up bone density testing, ask about it.

Proximal Humerus Fractures in Younger Patients

In children and adolescents, the proximal humerus is the site of a growth plate, and fractures in this age group typically go through that growth plate rather than through mature bone. These are classified using the Salter-Harris system. Most pediatric proximal humerus fractures can be managed without surgery because the growth plate has enormous remodeling potential, meaning the bone can reshape itself as the child grows.

Surgery becomes necessary when the fracture is severely displaced and cannot be reduced with closed manipulation. A review of adolescents who required open surgery found that soft-tissue structures, specifically the periosteum and the biceps tendon, were blocking reduction in 90 percent of cases. The deltoid muscle was interposed in 70 percent.³³ Unlike in elderly patients, where the concern is fragile bone, the challenge in young patients is strong soft tissue trapping the fragments out of position. Recovery in this age group is generally excellent, and avascular necrosis is rare because the blood supply to the humeral head is more robust in younger individuals.

Screw Orientation and Implant Design Research

For engineers and surgeons trying to reduce hardware failure, biomechanical simulation is increasingly shaping how implants are placed. Finite element analysis of locking plates has shown that optimizing screw orientation can reduce bone strain around the screws by roughly 17 percent compared with standard placement, while also increasing overall construct stiffness under vertical, sideways, and twisting loads.³⁴ These gains sound modest, but in osteoporotic bone where every millimeter of screw purchase counts, they could translate into fewer re-operations. This research is still more laboratory than bedside, but it hints at a future where patient-specific screw placement guided by computer modeling becomes routine.