Radial Head Fracture Rehabilitation: Mason Types I to III and Extension Preservation
In short
Radial head fractures challenge elbow stability and forearm rotation. Explore rehabilitation protocols across Mason types I to III, excision versus metallic arthroplasty, and preventing extension loss.
In this guide (6 sections)
Radial head fractures constitute approximately one-third of all elbow fractures, resulting from a fall onto an outstretched hand with the elbow slightly flexed and forearm pronated. The Mason classification categorizes these fractures into Type I (non-displaced or marginal split under 2mm), Type II (displaced partial-articular split greater than 2mm amenable to open reduction and internal fixation with headless mini-screws), and Type III (severely comminuted, non-reconstructible complete articular disruption). In Type III injuries with associated ligamentous instability (such as medial collateral ligament rupture or interosseous membrane disruption in Essex-Lopresti injuries), simple radial head excision leads to devastating proximal radial migration, wrist pain, and valgus elbow instability; modular metallic radial head arthroplasty is mandatory to maintain lateral column length. The primary objective in all radial head rehabilitation is preventing terminal elbow extension contracture and restoring forearm rotation.
Domestic and Cultural Indian Realities
Everyday Indian household activities place substantial rotational and axial demands on the radial head. Rolling dough with a belan, wringing out heavy cotton clothes, or grinding spices with a sil-batta creates repetitive axial compressive force across the radiocapitellar joint, which must be suspended for 8 to 10 weeks. Personal hygiene routines like bathing with a plastic mug (lota) require combined supination and flexion; patients should use lightweight vessels and practice smooth, unweighted movement. Pushing up from low floor seating, low wooden charpoys, or bathroom stools (patlas) concentrates upper body weight directly through the extended elbow, risking hardware displacement or prosthesis loosening; patients must stand using leg muscles and arm support on the uninjured side. Commuting on two-wheelers involves gripping handlebars and absorbing sudden road shocks; driving should be avoided until full joint clearance is confirmed.
Clinical Biomechanics and Anatomical Healing
The radial head serves two primary biomechanical roles: it acts as a secondary restraint against valgus elbow stress (providing 30% of valgus resistance in full extension and up to 50% in 90 degrees flexion) and acts as the primary restraint against axial proximal migration of the radius. The articular cartilage of the radial head articulates with both the humeral capitellum and the lesser sigmoid notch of the ulna. Immobilising the elbow for more than 7 to 10 days causes rapid capsular contracture, synovial adhesion, and irreversible loss of terminal elbow extension. Immediate early active mobilization (within 48 to 72 hours for Mason I and post-stable fixation) is safe because physiological active movement circulates synovial fluid without displacing stable fragments.
Validated Special Tests and Differential Diagnosis
Clinical evaluation includes gentle palpation of the radial head while passively rotating the forearm to identify crepitus or mechanical blocks. The Essex-Lopresti screening test assesses the wrist for distal radioulnar joint (DRUJ) tenderness and ulnar-sided pain (Piano Key test) to rule out longitudinal radioulnar dissociation. Range of motion is measured using a goniometer, recording flexion-extension and pronation-supination. Differential diagnosis distinguishes isolated radial head fractures from capitellar shear fractures and terrible triad dislocations using dedicated radiocapitellar oblique radiographs and CT scans.
Stage-by-Stage Functional Recovery Protocol
Phase 1 (Immediate Mobility, Weeks 0 to 2) provides a resting sling for comfort, discarded within 48 to 72 hours for Mason Type I injuries, while post-op arthroplasty uses a protective splint for 7 to 10 days. Patients perform active-assisted elbow flexion and extension, active forearm supination and pronation with the elbow at 90 degrees, and shoulder/wrist conditioning. Phase 2 (Restoration of Arc, Weeks 2 to 6) incorporates prone elbow extension hangs (low-load long-duration stretching to eliminate extension lag) and active terminal supination stretches. Phase 3 (Functional Loading, Weeks 6 to 12) progresses to light resistance exercises, biceps and triceps strengthening, and unrestricted domestic activities once bony consolidation or implant integration is verified.
Prone Gravity-Assisted Low-Load Long-Duration Elbow Extension
Objective: Counter anterior capsular tightness and restore terminal elbow extension
- 1Lie face down (prone) on a firm bed with your operated upper arm resting supported on the mattress.
- 2Position your elbow just over the edge of the bed so your forearm hangs freely toward the floor.
- 3Relax your biceps and shoulder muscles completely, allowing gravity to gently draw the forearm straight down.
- 4Breathe slowly and deeply, maintaining the relaxed hanging stretch for 5 to 8 minutes without tensing.
- 5Use your uninjured hand to gently lift the hanging arm back onto the bed when finished.
| Mason Fracture Type | Surgical Intervention Strategy | Early Motion Clearance | Extension Contracture Risk |
|---|---|---|---|
| Type I (Non-Displaced / Marginal) | Non-operative; sling for 48 to 72 hours only | Immediate active-assisted motion within 2 to 3 days | Low risk if immobilisation is kept under 7 days |
| Type II (Displaced Split / Step > 2mm) | ORIF with countersunk headless mini-screws | Active-assisted motion within 5 to 7 days post-surgery | Moderate risk; early extension hangs required |
| Type III (Comminuted Articular) | Metallic radial head arthroplasty (or excision if MCL intact) | Protected active motion in hinged brace at 7 to 10 days | High risk; aggressive prone extension stretching indicated |
Red Flags and Urgent Surgical Indicators
Seek immediate orthopaedic assessment if you experience a firm, mechanical block that completely stops the elbow from rotating or extending, which indicates an intra-articular loose bone fragment requiring arthroscopic or open removal. New-onset wrist pain on the little finger side accompanied by ulnar prominence suggests an unrecognised Essex-Lopresti interosseous membrane rupture. Weakness in extending the thumb or fingers indicates posterior interosseous nerve (PIN) neuropraxia.
Frequently Asked Questions
Why is keeping the arm in a plaster cast for a month harmful for a radial head fracture?
The elbow joint capsule and surrounding ligaments are dense and highly prone to rapid contracture. Keeping the elbow immobilised for several weeks causes thick scar tissue to form within days, resulting in permanent loss of straight extension and forearm rotation that often requires surgical release.
Can I lift weights or carry heavy items after receiving a radial head replacement?
Metallic radial head implants successfully restore elbow stability and joint spacing. However, repetitive heavy lifting greater than 10 to 15 kilograms should be minimized over the long term to prevent premature wear of the capitellar cartilage and loosening of the prosthetic stem.
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