Hand therapy milestones adjusted for growth plate status
Return to sport
Protective splinting mandatory for contact sports
Return to sport after ligament healing confirmed clinically
Background
Epidemiology
Incidence and prevalence
Among the most common skiing injuries — estimated 50,000-200,000 cases per year in North America
Accounts for 6-9% of all ski injuries
Predominantly acute mechanism in contemporary practice
Historically described in 1955 by Campbell in Scottish gamekeepers
Chronic attritional injury from neck-breaking technique
Contemporary usage refers to acute and chronic UCL injuries
Demographics
Affects all ages and both sexes
Peak incidence in active adults aged 20-40 years
Higher incidence in males due to contact sport participation
Sport-specific risk
Skiing: predominant modern cause of acute injury
Ball sports: football, basketball, baseball second most common
Pathophysiology
Anatomy of the thumb MCP joint
UCL anatomy
Proper UCL: primary stabilizer against valgus stress in flexion
Accessory UCL: taut in extension, stabilizes volar plate
Origin on metacarpal head, insertion on proximal phalanx base
Adductor aponeurosis relationship
Adductor pollicis aponeurosis lies superficial to UCL
Acts as barrier to UCL displacement under normal anatomy
Stener lesion mechanism
Complete UCL rupture at distal insertion
Proximal phalanx avulsed from UCL attachment
Folded adductor aponeurosis interposes between UCL and its insertion
Consequence of interposition
UCL displaced superficial to aponeurosis
Ligament cannot reattach to bone without surgical intervention
Stener lesion present in approximately 50-90% of complete tears
Biomechanics
UCL resists radial deviation (valgus stress) of thumb MCP
Critical for pinch and lateral key grip function
Failure leads to instability and pain with daily activities
Force transmission
Forces during skiing fall concentrate at thumb-pole strap interface
Rapid abduction force exceeds ligament tensile strength
Therapeutic Considerations
Evidence base for treatment decisions
Nonoperative management — partial tears
High success rate for Grade I-II tears with proper immobilization
4-6 weeks cast immobilization standard of care
Return to full activity at 12 weeks expected
Operative management — complete tears
Primary repair within 3-4 weeks yields excellent outcomes
Systematic review (Samora et al., 2013): high patient satisfaction with surgical repair
No significant difference in outcomes between suture anchor techniques
MUSCAT RCT (2024) — ongoing trial
Evaluating non-operative versus operative management for complete tears including Stener lesions
First high-quality RCT to address this question
Emerging considerations
Suture tape augmentation
Earlier return to function reported in small series
Long-term data pending
Chronic UCL insufficiency
Reconstruction preferred over primary repair when >3 months from injury
Palmaris longus autograft most commonly used
MCP arthrodesis reserved for painful arthrosis
ICD-10 coding
S63.641A — sprain of ulnar collateral ligament of right MCP joint, initial encounter
S63.642A — sprain of ulnar collateral ligament of left MCP joint, initial encounter
S63.641D — subsequent encounter
SNOMED CT: Injury of ulnar collateral ligament of metacarpophalangeal joint of thumb
Patient Discharge Instructions
copy discharge instructions
Diagnosis and explanation
Gamekeeper's thumb or skier's thumb — injury to the ulnar collateral ligament of your thumb
This ligament holds the thumb stable during pinching and gripping
Partial tears heal well with immobilization; complete tears may need surgery
Your treatment plan
You have been given a thumb spica splint to protect your thumb
Keep the splint on at all times unless instructed otherwise
Splint care instructions
Protect the splint
Keep it dry — cover with a plastic bag for showering
Do not modify or remove the splint unless hand surgery advises
Finger movement
Move your index, middle, ring, and little fingers freely
Move your thumb tip (IP joint) gently unless told otherwise
Pain management at home
Acetaminophen (Tylenol) for pain
500-1000 mg every 6 hours as needed
Do not exceed 4000 mg in 24 hours
Ibuprofen (Advil, Motrin) with food
400 mg every 6-8 hours as needed
Avoid if you have kidney problems, stomach ulcers, or are pregnant
Ice for swelling
15-20 minutes on, 20 minutes off
Wrap ice in cloth — do not apply directly to skin
Elevate your hand above heart level
Reduces swelling in the first 48-72 hours
Follow-up instructions
Book follow-up with hand surgery within 1-2 weeks
Sooner if you were told you have a complete tear or need surgery
Do not miss this appointment — delayed surgery leads to worse outcomes
Your surgeon will arrange further imaging if needed
Ultrasound or MRI may be ordered to plan your care
Return to emergency department immediately if
Increasing instability or worsening inability to pinch or grip
Severe worsening pain, numbness, or tingling in the thumb
White, blue, or cold fingertips suggesting circulation problems
Signs of infection if you had surgery: increasing redness, warmth, drainage, or fever >38.5°C
Splint feels too tight, causes numbness, or your fingers swell markedly
Activity and return to sport
No contact sports or gripping activities until cleared by hand surgery
Partial tears: expect 6-12 weeks to full activity
Complete tears after surgery: 12 weeks to unrestricted use
Driving
Do not drive with the splint on your dominant hand until cleared
Work
Light duties may be possible; heavy manual work requires surgical clearance
References
Guidelines and key sources
Primary evidence sources
Chang AL, Merkow DB, Bookman JS, Glickel SZ. Thumb MCP Joint UCL Injuries: Management and Biomechanical Evaluation. J Am Acad Orthop Surg. 2023
PMID 36548149
Comprehensive review of management and biomechanics
Ritting AW, Baldwin PC, Rodner CM. UCL Injury of the Thumb MCP Joint. Clin J Sport Med. 2010
PMID 20215892
Mechanism, examination, and classification review
Rhee PC, Jones DB, Kakar S. Management of Thumb MCP UCL Injuries. J Bone Joint Surg Am. 2012
PMID 23138242
Stress testing thresholds and surgical decision-making
Imaging evidence
Rashidi A et al. Evidence-Based Use of Clinical Exam, US, and MRI for UCL Tears. Eur Radiol. 2021
PMID 33459856
Systematic review and meta-analysis of imaging performance
Qamhawi Z et al. Diagnostic Accuracy of US and MRI in Detecting Stener Lesions. J Hand Surg Eur. 2021
PMID 33596684
Meta-analysis: US sensitivity 95%, specificity 94% for Stener lesion
Ebrahim FS et al. US Diagnosis of UCL Tears of the Thumb and Stener Lesions. Radiographics. 2006
PMID 16844929
Technique and pattern-based approach for ultrasound diagnosis
Classification and outcomes
Milner CS, Manon-Matos Y, Thirkannad SM. Gamekeeper's Thumb — Treatment-Oriented MRI Classification. J Hand Surg. 2015
PMID 25300993
Type 1-4 classification guiding operative versus nonoperative decisions
Samora JB et al. Outcomes After Injury to Thumb UCL — Systematic Review. Clin J Sport Med. 2013
PMID 23615487
High patient satisfaction with surgical repair confirmed
Beutel BG, Melamed E, Rettig ME. The Stener Lesion and Complete UCL Injuries — Review. Bull Hosp Jt Dis. 2019
PMID 30865860
Definitive review of Stener lesion biology and surgical management
Additional references
Avery DM, Caggiano NM, Matullo KS. UCL Injuries of the Thumb: Comprehensive Review. Orthop Clin North Am. 2015
PMID 25771322
Rehabilitation protocols and return to sport timelines
de Haas L et al. MUSCAT Study: RCT Protocol for Non-Operative vs Operative Treatment. Trials. 2024
PMID 39468632
Ongoing RCT challenging universal surgical recommendation for Stener lesions
Fricker R, Hintermann B. Skier's Thumb: Treatment, Prevention and Recommendations. Sports Med. 1995
PMID 7740248
Surgical timing and prevention strategies
Richard JR. Gamekeeper's Thumb: UCL Injury. Am Fam Physician. 1996
PMID 8623701
Clinical approach including medication considerations
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