Clavicle Fracture Shoulder Rehab: Bone Healing Timeline and Exercises

Clavicle fractures make up roughly 2 to 5 percent of all fractures, and they show up constantly in sports medicine and emergency clinics — a fall off a bike or motorcycle, a shoulder-first tackle, a skateboard spill where the hand goes down first and the force travels up through the arm. The frustrating part for most patients isn't the break itself. It's discovering months later that the bone healed fine on X-ray but the shoulder still doesn't move the way it used to. The clavicle works as the strut that keeps the shoulder blade correctly positioned against the rib cage, so once that strut is compromised, even temporarily, the muscles and joints around it start compensating in ways that don't automatically correct themselves once the fracture line disappears.

This article walks through the fracture patterns that determine whether surgery or a sling is the better option, the week-by-week rehabilitation timelines for each path, the specific exercises assigned at each stage, and where near-infrared LED can reasonably fit in as a wellness-support routine rather than a treatment. The single idea worth keeping in mind from start to finish: bone union and shoulder function are two separate recovery clocks. One is tracked on X-ray. The other is tracked by how the shoulder blade moves, how much the rotator cuff has re-engaged, and whether the arm can go overhead without pain. Treating the first as if it were the whole story is the most common reason people end up with a healed clavicle and a shoulder that still doesn't work properly a year later.

Clavicle Fracture Anatomy and Healing Stages

Fracture Location and Classification

The clavicle is the S-shaped bone connecting the sternum to the shoulder blade, and it's the only bony strut linking the arm to the trunk skeleton — everything the arm does eventually loads through this one bone. Fractures are grouped into three zones based on the Allman classification, and where the break sits changes both the treatment decision and what to expect during rehab.

• Middle third (shaft) fractures: About 80 percent of all clavicle fractures fall here, making this by far the most common pattern. Surgical fixation is considered when displacement is significant or the bone is comminuted into several pieces.
• Distal (lateral) third fractures: These sit near the acromioclavicular joint. When the surrounding ligaments tear along with the bone, the nonunion risk runs higher than for shaft fractures.
• Proximal (medial) third fractures: The least common pattern, occurring near the sternoclavicular joint.

The Three Biological Stages of Bone Healing

Fracture healing moves through three overlapping stages: inflammation, repair (callus formation), and remodeling. During the inflammatory stage, roughly the first week, a hematoma forms at the fracture site and inflammatory cells migrate in to clear debris and signal the repair process to start. The repair stage, spanning roughly weeks two through six, is where a soft cartilaginous callus forms first, converts to a fibrous callus, and then hardens into bony callus; this is the stage radiographs are checked against to see whether union is progressing on schedule. The final remodeling stage runs for months, sometimes past a year, as the bone gradually reshapes itself back toward its original strength and contour.

Robinson and colleagues (2004, Journal of Bone and Joint Surgery) followed a large cohort of clavicle fracture patients and found that displaced midshaft fractures treated conservatively carried a nonunion rate reported as high as 15 percent, while surgically fixed fractures showed a significantly lower rate. A later randomized trial from the Canadian Orthopaedic Trauma Society (2007, JBJS) compared surgical fixation against conservative treatment for displaced midshaft fractures and reported both a lower nonunion rate and an earlier return to function in the surgical group. Both papers make the same secondary point worth remembering: shoulder pain and stiffness track much more closely with the quality of the rehab exercise program than with whether the bone is united or not.

Factors That Delay Union

Smoking, diabetes, older age, severe comminution, distal-third location, and high-energy injury mechanisms are all recognized risk factors for delayed or absent union. None of these should be treated as a reason to avoid rehab, but they are a reason to build in a more conservative pace, checking radiographs more frequently before pushing exercise intensity rather than following a generic week-by-week calendar.

Why Ruling Out Associated Injuries Comes First

The subclavian artery and vein, the brachial plexus, and the top of the lung all run directly beneath the clavicle. In high-energy mechanisms such as car accidents or high-speed falls, vascular injury, nerve injury, or a pneumothorax can accompany the fracture, though this is uncommon. That's why initial evaluation often includes checking the pulse, sensation, and motor function of the arm along with a chest X-ray. Before starting any rehab program, confirming that these were ruled out during the initial workup is the safest first step, not an optional formality.

Healing Speed Varies Sharply by Age

Children and adolescents have thicker periosteum and a much greater remodeling capacity, so clinical union at 3 to 4 weeks is common in this age group. Adults typically take 6 to 12 weeks, and older adults or anyone with underlying osteoporosis can take longer still. This matters practically because a rehab timeline written for a teenager's fracture will be too aggressive if applied directly to an adult's — the exercise progression needs to be tied to that individual's radiographic findings and age-adjusted expectations, not a single fixed calendar.

Why the Shoulder — Not Just the Collarbone — Ends Up the Problem

Because the clavicle sits at the base of the shoulder girdle's kinetic chain, immobilizing it for even a few weeks changes how the whole upper quarter moves. The scapula normally glides and rotates on the rib cage in a coordinated pattern with the humerus, known as scapulohumeral rhythm, and that pattern depends on the clavicle staying at its normal length and position. A sling holds the arm still, which the bone needs, but it also lets the muscles that control scapular position — serratus anterior, lower trapezius, rhomboids — go quiet for weeks at a time. When those muscles come back online more slowly than the bone heals, the shoulder tries to reach the same range of motion using compensatory patterns, hiking the shoulder blade or substituting upper trapezius for rotator cuff activity, and those compensations are what generate the impingement-like pain many patients describe well after the fracture itself has stopped hurting.

Rehab Timelines and Exercise Protocols by Treatment Type

Conservative Treatment (Sling) Rehab Timeline

Surgical Fixation (Plate) Rehab Timeline

After surgical plate fixation, the bone is mechanically stabilized, which generally allows earlier motion than the conservative pathway. The first 1 to 2 weeks after surgery focus on pain control and wound care, with wrist and elbow exercises done while the sling stays on. Pendulum exercises and passive-assisted flexion typically start around week 2, and active range of motion expands around week 4 depending on the surgeon's radiographic findings and the patient's pain level. Resistance exercise is introduced in stages from week 6 onward, with a return-to-sport target somewhere between weeks 8 and 12 depending on the surgeon's confirmation that the fracture has united.

Why Scapular Stabilization Exercise Matters

Because the clavicle acts as the strut that positions the shoulder blade, the muscles surrounding the scapula, namely the serratus anterior, lower trapezius, and rhomboids, tend to weaken quickly during any period of immobilization. If arm exercises resume before these muscles have recovered, scapulohumeral rhythm breaks down and impingement-like pain can appear even though the fracture itself is healing normally. Below is a practical week-by-week guide to scapular stabilization work.

• Weeks 4-6: Wall push-ups for scapular protraction; isometric shoulder blade squeezes for scapular retraction
• Weeks 6-8: Low-row resistance band work; low-angle active flexion and abduction
• Weeks 8-12: Theraband external and internal rotation; wall slides
• 12+ weeks: Cable diagonal patterns; weight-bearing plank variations

Posture and upper-body alignment matter here too. When the shoulders round forward or the upper back stiffens from weeks of guarded movement, scapular positioning drifts along with it. The office stretch routine covers alignment work that pairs well with this phase, particularly for anyone doing most of their recovery at a desk job.

How to Perform the Codman Pendulum Exercise Correctly

The pendulum exercise is the most widely prescribed movement in early clavicle rehab, and it's also one of the most frequently done wrong. Lean forward slightly from the hips, let the injured arm hang completely relaxed toward the floor, and use a small rocking motion of the trunk, not the arm itself, to let the shoulder joint trace passive circles. The point patients miss most often is that the arm muscles should stay switched off the entire time; if you're actively swinging the arm, you've turned it into a different exercise. Do 10 to 15 repetitions clockwise, then counterclockwise, then repeat the pattern front-to-back and side-to-side. Stay strictly within a pain-free range and let the diameter of the circle grow gradually as comfort allows, not on a fixed schedule.

Progression Markers: When to Move to the Next Stage

A calendar gives a rough guide, but the actual signal to progress should come from the tissue, not the date on it. Before increasing range of motion or exercise load, the standard checks are: the previous stage's exercises can be completed for several consecutive days without a flare in rest pain; there's no new tenderness directly over the fracture line when it's palpated; and the surgeon or physiotherapist has confirmed the expected radiographic stage on schedule. If any of those three isn't true yet, holding at the current stage for another week does far less harm than pushing ahead on a fixed calendar and re-irritating a fracture that hasn't caught up.

Stop signs that should end a session immediately: sharp, localized pain at the fracture site that's distinct from the dull ache of stretched, stiff tissue; a grinding or clicking sensation under the skin at the break; or a sense that the shoulder gave way during a motion that had been comfortable the day before. Any of these three warrants a call to the treating surgeon before the next scheduled exercise session, not just a mental note to go easier next time.

Common Mistakes

• Removing the sling early because the pain has become tolerable. This raises the risk of the fracture fragments shifting out of alignment before they're ready to bear that load.
• Focusing entirely on the shoulder and neglecting wrist and finger motion, which can produce a secondary stiffness that then needs its own separate rehab.
• Jumping straight to increasing shoulder flexion and abduction angles without first rebuilding scapular stabilization. This is the single most common cause of impingement-like pain showing up mid-recovery.
• Repeating the same exercise intensity for too long out of caution, or the opposite, increasing intensity every session regardless of how the previous one felt. The right pace is dictated by several pain-free days at the current level, not a fixed weekly jump.

Recovery Goals and Progress Markers by Phase

Clavicle fracture rehab shouldn't be judged on pain reduction alone. Radiographic union findings and functional measures need to be tracked together. Commonly used clinical tools include the DASH (Disabilities of the Arm, Shoulder and Hand) questionnaire, shoulder range-of-motion measurement, and isometric strength testing with a handheld dynamometer.

What to Check at Each Recovery Stage

1. 0-4 weeks (acute phase): The goals are pain and swelling control, consistent sling use, and preventing stiffness in the wrist, fingers, and elbow. Overusing the arm during this window risks shifting the fracture alignment.
2. 4-8 weeks (early recovery phase): Once callus formation shows on X-ray, active range of motion is gradually expanded. A common target is shoulder flexion and abduction reaching 70 to 80 percent of the uninjured side.
3. 8-12 weeks (strength recovery phase): Scapular stabilizer and rotator cuff strength generally needs to reach at least 80 percent of the uninjured side before resistance exercise intensity is increased further.
4. 12+ weeks (functional return phase): The target here is full range of motion, strength comparable to the uninjured side, and pain-free performance of sport-specific movements such as throwing or overhead work.

How Union Is Confirmed

Radiographically, union is called once callus bridges the fracture line across at least three cortices. Clinically, it's confirmed when palpating the fracture site produces no tenderness and no abnormal motion. Conservative treatment typically reaches this point at 6 to 12 weeks, and surgically fixed fractures reach it around the same time or somewhat sooner, but individual variation and fracture pattern can shift this considerably, so the treating physician's radiographic read is always the deciding factor, not a calendar.

Functional Recovery Tracked Through DASH Scores

DASH scores are more useful as a way to track an individual's own trajectory than as an absolute benchmark to compare against someone else's numbers. If pain or function is recovering more slowly than these ranges suggest, that's a signal to revisit the cause with the treating physician rather than simply waiting longer.

Precautions and Re-Injury Prevention

Non-Negotiables During Rehab

• Don't remove the sling on your own before radiographic confirmation: Discontinuing immobilization early raises the risk of fragment displacement or nonunion.
• Don't push range of motion through pain: A sharp pain or a distinct grinding sensation at the fracture site means stop the exercise immediately and check in with the treating physician.
• Manage sleep position: In the first few weeks, sleeping semi-reclined or with the injured side facing up tends to reduce pain more than lying flat.
• Quit smoking if you smoke: Smoking is one of the best-documented risk factors for delayed union, and quitting during the rehab period is strongly advised.

NIR Use: What to Watch For

• Never aim the light directly at the eyes; wear protective goggles if needed.
• If taking medication that can cause photosensitivity, such as certain antibiotics or some antiarrhythmics, check with the prescribing physician before use.
• Avoid use over an unhealed surgical wound or over skin around a metal implant that shows redness or discharge. Check with the treating physician instead.
• NIR is a supporting routine, not a substitute for medical rehabilitation. Persistent or worsening pain should always be evaluated by an orthopedic specialist first.

Warning Signs That Need an Orthopedic Recheck

Even when rehab has been going smoothly, certain signals mean it's time to stop self-managing and get reassessed rather than pushing through. These include a sudden narrowing of range of motion at a specific angle that wasn't there before; a new clicking sound or abnormal movement felt at the fracture site; pain that worsens at night even at rest; unexplained weight loss alongside persistent bone pain; new numbness, tingling, or weakness spreading down the arm; and shoulder strength that seems to be getting weaker rather than better over successive weeks. Any of these can point toward nonunion, hardware loosening, a secondary injury, or, rarely, something unrelated to the original fracture that deserves its own workup. Catching these early matters more for long-term function than any single week of exercise progress.

Return-to-Sport Criteria to Avoid Re-Injury

The absence of pain by itself isn't a reliable signal to return to contact sport or activities with a real fall risk. The safer standard combines full range of motion, strength at 90 percent or more of the uninjured side, complete radiographic union, and passing functional tests such as the one-arm hop test or a closed-chain upper-extremity stability test, all four together rather than any single one, before a staged return to sport.

Practical Tips for Daily Life

• Driving: Wait until the sling is fully off and both hands can operate the wheel without pain. This typically isn't before 4 to 6 weeks as a general marker, though it depends on the individual case.
• Sleep: A semi-reclined position or propping the injured arm on a pillow tends to ease pain better than lying flat in the early weeks.
• Getting dressed: Put the injured arm into sleeves first, and take it out last when undressing. This sequence reduces the shoulder strain involved in the motion.
• Carrying bags or lifting: Avoid anything that loads weight onto the injured shoulder, whether it's a bag strap, groceries, or a child on that hip, until union is confirmed on X-ray.
• Caring for young children: Lifting, carrying, or feeding a child one-armed puts repeated load through a healing clavicle in ways that are easy to underestimate. Using the uninjured arm for lifting and getting help for anything that requires both arms is worth the inconvenience for the first several weeks.
• Returning to work: Desk-based work can usually resume once pain is reasonably controlled. Jobs requiring repetitive overhead use of the arm or handling heavy loads should wait for a strength-test-based clearance, discussed directly with the treating physician rather than judged by feel alone.