Elbow (Complete) Flashcards
What is the normal valgus carrying angle of the elbow?
[JAAOS 2018;00:1-10]
11°men
13° women
What is normal elbow ROM?
[JAAOS 2018;00:1-10]
Full extension
145° flexion
75o pronation
85o supination
Describe the distal biceps tendon anatomy and insertion
[Orthopaedic Journal of Sports Medicine June 2015 vol. 3 no. 6]
- The tendon externally rotates 90°
* Brings the medial short head fibres anterior and the lateral long head fibres posterior - The tendon inserts with:
- Short head fibres distal on the radial tuberosity
- Stronger flexor
- Long head fibres proximal
- Stronger supinator
What are the reported deficits with nonoperative management of complete distal biceps tears?
Supination
- 79% endurance [50% loss]
- 21-55% strength [40% loss]
Flexion
- 10-40% strength [30% loss]
- 30% endurance
What are the risk factors for distal biceps tendon tear?
- Increased BMI
- Increased muscle mass = increased tendon load
- Obesity = decreased immune response to tendon healing
- Smoking
- Safran and Graham -7.5x greater risk (limited population n=14)
- Kelly et al - odds ratio of 4.47 in patients less than 65
- Increases zone of hypovascularity
- Anabolic steroid use
What are the special tests to evaluate for distal biceps tears?
- ‘Hook test’
- Ask the patient to actively flex the elbow to 90° and to fully supinate the forearm
- Examiner uses index finger to hook the lateral edge of the biceps tendon
- With an intact or even partially intact biceps tendon, the finger can be inserted 1 cm beneath the tendon
- When there is no cordlike structure under which the examiner may hook a finger, the biceps tendon is not in continuity
- ‘Passive forearm pronation’
- Passive forearm pronation from supinated position should result in proximal-to-distal migration of biceps muscle belly
- Loss of visible and palpable migration occurs with complete rupture of distal biceps tendon
- ‘Biceps crease interval’
- Measure the distance between the biceps cusp and the antecubital crease
- BCI > 6.0 cm or biceps crease ratio greater than 1.2 had a sensitivity of 96% and a diagnostic accuracy of 93% for identifying complete distal biceps tendon ruptures
- ‘Bicipital aponeurosis flex test’
- Patient makes a fist, flexes the wrist, flexes elbow to 75° tensioning the lacertus fibrosus
- Palpate location 1 – sharp medial edge of lacertus fibrosus
- Palpate location 2 – round lateral edge of distal biceps tendon
- Palpate location 3 – valley between lacertus and biceps tendon
- ‘Biceps squeeze test’
* Patient seated with forearm resting on lap in 60-80° flexion and slight pronation
* Examiner squeezes the biceps brachii with both hands
* Positive test is a lack of forearm supination
What is the management of a distal biceps tear?
Operative Indications
- Complete tear in medically fit patient unwilling to accept functional losses
- Persistent pain following initial conservative management of partial tear
- Nonoperative Indications
- Low demand patient
- Medically unfit for surgery
- Partial tear involving <50%
What are the surgical considerations for distal biceps tears?
- Timing
- Acute repair is favoured within 3 weeks of injury
- Delay results in tendon retraction, adhesions, loss of elasticity
- May require more extensile approaches and dissection leading to complications
- Intact lacertus fibrosus may limit retraction and permit delay
- No consensus on definition of chronic
- ?>3 weeks, ?>2 months, ?>4 months
- Chronic injuries limit ability to repair primarily
- Techniques include repair in high flexion (>70°) and tendon augmentation with graft
- Anatomic vs. Non-anatomic repair
- 3 components of anatomic distal biceps repair:
- Replicate the external rotation of the tendon
- Restore the native short and and long head attachment sites
- Preserve the radial tuberosity anatomy
- Nonanatomic repairs result in:
- Failure to recreate the tendon external rotation
- Create attachment site that is more anterior than the native footprint
- Reduce the height of the radial tubersity by creating a trough
- Clinical importance?
- Anatomic repairs have been shown to have improved supination strength
- Nonanatomic repairs cause premature unwinding of the distal tendon and the loss of the cam effect of the radial tuberosity
- Single vs. Double Incision
- Single-Incision Technique
- Longitudinal, transverse or S-shaped incision (extensile)
- Identify and protect the LABC nerve
- Interval:
- Proximal – brachioradialis and brachialis
- Distal – brachioradialis and pronator teres
- Leash of radial recurrent vessels may need ligating
- Forearm held in supination to protect the PIN and bring the radial tuberosity into view
- Double-Incision Technique
- ‘Modified Boyd-Anderson approach’
- Utilizes the same anterior incision as the single-incision
- Radial tuberosity is identified and a curved kelly is passed along its medial border between the radius and ulna
- With the arm in full pronation to protect the PIN the posterior incision is made over the tip of the kelly
- The ECU is split exposing the radial tuberosity
- Distal biceps fixation technique
- Options include:
- Bone tunnel fixation
- Sutures tied over bone bridge
- Suture anchor
- Interference screw
- Cortical button
- Extramedullary or Intramedullary
- Hybrid (button/interference screw)
- Bone tunnel fixation
- Greatest pullout strength = cortical button
- Endobutton> suture anchors/repairs=Trans osseus >interference screw
- Postoperative management
- Endobutton> suture anchors/repairs=Trans osseus >interference screw
- Splint elbow in 90° flexion and supination for 1-2 weeks
- Once splint discontinued start ROM
- Forearm rotation emphasized
- Terminal elbow extension avoided for first 6 weeks
- Resistance training started 8 weeks post surgery
- Heavy activities resumed 3-5 months post surgery
What are the complication rates of single vs. double incision techniques for distal biceps tendon repair?
[The Orthopaedic Journal of Sports Medicine Oct 2016 vol. 4 no. 10]
- More common in Single Incision
- Neuropraxia (9.9% vs. 2.2%)
- PIN palsy (1.7% vs. 0.2%)
- Rerupture (2.1% vs. 0.6%)
- Total complications (28.2% vs. 20.9%)
2. More common in Double Incision - HO (7.2% vs. 3.2%)
- Synostosis (2.2% vs. 0%)
What are the potential causes of a stiff elbow?
[Curr Rev Musculoskelet Med (2016) 9:190–198]
- Intrinsic causes
- Joint incongruity
- Cartilage loss
- Intra-articular malunion
- Particularly the ulnohumeral joint
- Arthritis
- Loose bodies
2. Extrinsic causes - Burns
- Muscle contracture
- Heterotopic bone
- Joint capsule contracture
- Ligament contracture
- Posterior band of the MCL
- Extra-articular malunions
- Loss of the normal anterior translation of the capitellum and trochlea relative to the anterior humeral shaft
- Nonunion
3. Other - Inflammatory arthritis
- Hemophilia
- Infection
What is the functional range of motion of the elbow?
[J Am Acad Orthop Surg 2011;19: 265-274]
100° flexion-extension arc (30°-130°)
100° pronation-supination arc (50°-50°)
What range of motion loss is better tolerated?
[JAAOS 2015;23:328-338]
Extension loss is better tolerated than flexion loss
Treatment options for the stiff elbow
[Curr Rev Musculoskelet Med (2016) 9:190–198]
- Nonoperative (consider within first 6 months)
- Therapy
- Splinting
- Static progressive splinting
- Stepwise increase in the joint angle
- Force applied to tissues decreases as the tissues stretches
- Dynamic splinting
- Consistent force is applied to the tissues as they stretch
- Static progressive splinting
- Manipulation under anaesthesia
2. Operative - Open release
- Lateral approach (lateral column procedure)
- Medial approach (medial column procedure)
- Anterior approach (rare)
- Arthroscopic release
- Interpositional arthroplasty
- Alternative to arthroplasty in younger patients
- Total elbow arthroplasty
- Partial elbow arthroplasty
- Arthrodesis
What are the indications for elbow release surgery?
[JAAOS 2015;23:328-338]
- Stiffness that limits ADLs
- Nonoperative treatment should attempted for at least 3-4 months
- Tissue equilibrium should be reached
- No swelling or erythema
What are contraindications for elbow release surgery?
[JAAOS 2015;23:328-338]
- Closed head injury with neurologic dysfunction
- Noncompliant patient
- Joint space narrowing (relative)
- Incongruous elbow (relative)
- May require two-stage procedure
- 1st stage
- Joint reduction and ligament repair/reconstruction
- 2nd stage
- Elbow release after tissue equilibrium reached
- 1st stage
- Pain in midarc (relative)
- Inadequate soft tissue envelope (relative)
* Consider plastics consult for flap coverage
What structures need to be addressed to improve flexion and extension in a stiff elbow?
- Flexion
- Posterior joint capsule
- Triceps adhesion
- Coronoid process osteophytes
- Coronoid and radial fossa
- Posterior band of the MCL
2. Extension - Anterior joint capsule
- Brachialis adhesion
- Olecranon osteophyte
- Olecranon fossa
3. Other - Loose body
- Hardware
- Heterotopic ossification
What are the advantages and disadvantages of an open lateral approach for management of a stiff elbow?
[JAAOS 2015;23:328-338]
- Advantages
* Simple, access to all 3 articulations - Disadvantages
* No access to ulnar nerve
What are the advantages and disadvantages of an open medial approach for management of a stiff elbow?
[JAAOS 2015;23:328-338]
Advantages
- Direct ulnar nerve access
- More cosmetic scar
- Direct release of posteromedial capsule
Disadvantages
- No lateral joint access
- Proximity to MABCN
- Potentially more muscle morbidity with elevation of flexor-pronator mass
Describe the open medial approach for elbow release?
[JAAOS 2015;23:328-338]
- Incision
- 6-8cm proximal to medial epicondyle and 1cm posterior to medial intermuscular septum
- Extended distally curving anteriorly 5-6cm
- Protect the MABCN
- Ulnar nerve release
* Release from septum to FCU - Expose posterior elbow
- Elevate triceps off medial intermuscular septum, distal humerus and posterior joint capsule
- Perform posterior capsulectomy
- Debride the joint
- Elevate or excise the posterior fat pad
- Remove fibrous tissue
- Remove loose bodies
- Olecranon fossa deepening
- Olecranon tip excision
- Release the posterior bundle of the MCL
- Expose the anterior elbow
- Elevate the brachialis and anterior 2/3 of the flexor-pronator mass off the distal humerus and anterior capsule
- Perform anterior capsulectomy
- Debride the joint
- Remove fibrous tissue
- Remove loose bodies
- Coronoid and radial fossa deepening
- Coronoid tip excision
- Brachialis and triceps release
- Bluntly elevate muscles off humerus proximally
- Do not perform tendon lengthening
- Close
- Repair the flexor pronator mass
- Transpose ulnar nerve anteriorly
- Place a drain
- Apply soft dressing
Describe the open lateral approach for elbow release?
[JAAOS 2015;23:328-338]
- Incision
* 8-12cm from lateral supracondylar ridge to the interval between anconeus and ECU (Kocher) - Expose posterior joint
- Elevate triceps off posterior humerus and joint capsule
- Perform posterior capsulectomy
- Debride posterior joint
- Elevate or excise the posterior fat pad
- Remove fibrous tissue
- Remove loose bodies
- Olecranon fossa deepening
- Olecranon tip excision
- Access the lateral gutter
- [Posterior radiocapitellar joint – “soft spot”]
- Reflect anconeus posterior with triceps
- Incise capsule posterior and proximal to radial head
- Debride lateral gutter
- Osteophytes or loose bodies behind capitellum
- Synovitis
- Expose anterior joint
- Interval between ECRL and ECRB distally
- Elevate brachialis and ECRL off the anterior joint capsule and distal humerus
- Perform anterior capsulectomy
- Debride the anterior joint
- Remove fibrous tissue
- Remove loose bodies
- Coronoid and radial fossa deepening
- Coronoid tip excision
- Debride the PRUJ and radiocapitellar joint if supination/pronation limited
- Bony spurs
- Release anterior capsule and annular ligament
- Close
- Repair the Y-shaped fascial split
- Intervals between anconeus and ECU/ECRL and ECRB
- Place a drain
- Apply a soft dressing
What is the postoperative management following open surgical elbow release for stiff elbow?
[JAAOS 2015;23:328-338]
- Immediate CPM
* Continue for 1 month - Formal therapy start POD1
- Early static progressive elbow splinting
- Wear for 30mins 3 times per day
- Alternate flexion and extension
- Continue for several months
- Indomethacin x3/52
- Single-fraction radiation therapy in a dose of 700 cGy within the first 48 hours of surgery may be used in selected cases in which extensive heterotopic bone has been removed.
Post open surgical release of a stiff elbow, how long is the final ROM maintained for?
[JAAOS 2015;23:328-338]
ROM achieved at 1 year can be expected to be maintained for up to 10 years
What complications are associated with open elbow release for stiff elbow?
[JAAOS 2015;23:328-338]
- Ulnar neuritis
- Wound complications
- Loss of ROM
- HO
- Pain CRPS
- Triceps insufficiency
- Instability
What are the contraindications for arthroscopic elbow release?
[JAAOS 2011;19:265-274]
- Extensive HO
- Severe elbow contractures
- Extra-articular adhesions
- Muscle adhesions
- Difficulty insufflating joint
- Loss of pronation/supination
- Prior ulnar nerve translocation (relative)
- Severe articular damage or incongruity
When should ulnar nerve transposition be considered when releasing a stiff elbow?
[JAAOS 2011;19:265-274]
- Preoperative elbow flexion ≤90 degrees
- Preoperative ulnar nerve symptoms
What is the Outerbridge-Kashiwagi ulnohumeral arthroplasty?
[JAAOS 2002;10:106-116]
- Indicated for stiffness due to primary osteoarthritis
* Allows for debridement of the anterior and posterior compartments with less soft tissue dissection - Technique
- Posterior midline incision
- Triceps split
- Posterior capsulectomy
- Olecranon tip excision
- Olecranon fossa fenestration (burr or trephine)
- Coronoid and radial head debridement and loose body removal
What are the static and dynamic stabilizers of the elbow?
[AAOS comprehensive review, 2014]
- Primary static constraints
- Ulnohumeral articulation
- Anterior bundle of MCL
- LCL complex
- Secondary static restraints
- Radiocapitellar articulation
- Common flexor origin
- Common extensor origin
- Capsule
3. Dynamic constraints - Triceps
- Anconeus
- Brachialis
What is the anatomy and function of MCL of the elbow?
[World J Orthop 2018 June 18; 9(6): 78-84]
- Function
- Primary static stabilizer
- Resists valgus
- Anterior band tight in extension
- Posterior band tight in flexion
- Origin
- Anterior, inferior and lateral aspect of the medial epicondyle
- Posterior to the elbow axis of rotation
- Insertion
- Sublime tubercle and UCL ridge
- UCL ridge extends from the sublime tubercle distally as the ligament tapers out [JAAOS 2014;22:315-325]
- Recently shown to have a longer and distally tapered insertion
- Extending beyond the sublime tubercle
What is the anatomy of the LUCL of the elbow?
[Okajimas Folia Anat. Jpn. 2017; 93(4)147]
- Function
- Primary static stabilizer
- Resists varus
- Resists posterolateral rotatory instability
- Origin
* Center of capitellum, anterior to lateral epicondyle - Course
- Attached to the annular ligament
- Located at the 8 to 9 o’clock position of the radial head
- Acts as a hammock to the radial head
- Insertion
- From lesser sigmoid notch to the supinator crest
- Proximal edge is 7mm distal to the proximal radial head
What is the progression of soft tissue disruption around the elbow at the time of dislocations?
[Shoulder & Elbow 2017, 9(3) 195–204][AAOS comprehensive review, 2014]
- Controversial, some believe the MCL is always disrupted
- Circle of Horii
- Stage I
- Disruption of the LUCL
- Results in posterolateral rotatory subluxation
- Disruption of the LUCL
- Stage II
- Disruption of other lateral ligamentous structures + anterior and posterior capsule
- Incomplete posterolateral dislocation
- Disruption of other lateral ligamentous structures + anterior and posterior capsule
- Stage III
- Disruption of the MCL
- Complete posterior dislocation
- Stage IIIA - Posterior band of MCL
- Stage IIIB - Entire MCL
- Stage IIIC - distal humerus stripped of soft tissue
- Flexor-pronator origin disrupted
3. Injury ladder for posterolateral simple elbow dislocations
- Flexor-pronator origin disrupted
- Disruption of the MCL
- Injury starts medial and progresses ‘up the ladder’
- Medial ligament tear → CFO avulsion → anterior capsule tear → lateral ligament tear → common extensor tendon avulsion
- Goal of surgery is to ‘bring the patient down the ladder’
What is the management of simple elbow dislocation?
- Closed reduction
- Technique
- Supinate the forearm
- Correct medial/lateral displacement
- Apply inline traction allowing the coronoid to clear the trochlea
- Flexion with pressure to the olecranon
- Assess stability
- Determine stable arc of motion
- Determine if more stable in pronation, neutral or supination
- Splint arm in 90° with forearm in position of stability
- Postreduction radiographs
- Ensure concentric reduction and no fractures
- Nonoperative
- Ensure concentric reduction and no fractures
- Post reduction splint for 5-7 days
- Initiate gravity-assisted overhead motion protocol [J Hand Surg Am. 2015;40(3):515e519]
- Patient is supine with the shoulder flexed, adducted and in neutral external rotation position
- Eliminates gravitational varus and distraction forces
- In this position elbow flexion/extension and pronation/supination are performed
- Limits of motion are dictated by patient
- Arm is splinted in 90o when not performing exercises
- Overhead motion performed for 3-4 weeks
- Upright motion started at 3-4 weeks
- At 6 weeks progress ROM, strengthening, ADLs
- Operative [AAOS comprehensive review,2014]
- Patient is supine with the shoulder flexed, adducted and in neutral external rotation position
- Indications
- Incongruent joint postreduction
- Stability not maintained by closed means
- Open
- Neurovascular injuries requiring surgery
- Technique
- Repair LUCL/common extensor origin
- +/- MCL repair
- +/- hinged ex-fix
What is the definition of a complex elbow dislocation?
[JAAOS 2015;23:297-306]
Elbow dislocation with associated fracture
Of elbow dislocations, what percentage are complex?
[JAAOS 2015;23:297-306]
26%
What are the 3 injury patterns and mechanisms of complex elbow dislocations?
[JAAOS 2015;23:297-306]
- Axial loading
- Valgus posterolateral rotatory
- Varus posteromedial rotatory
What is the most common injury pattern in complex elbow dislocations?
[JAAOS 2015;23:297-306]
Valgus posterolateral rotatory injury (80%)
What is the mechanism of an axial loading injury (in context of complex elbow dislocation)?
[JAAOS 2015;23:297-306]
The dorsal forearm sustains a direct blow resulting in the distal humerus impacting the greater sigmoid notch of the ulna
- “Transolecranon fracture dislocation”
- “Pilon fracture of the elbow”
What effect does a transolecranon fracture dislocation have on the PRUJ, MCL and LCL?
[JAAOS 2015;23:297-306]
- PRUJ remains intact
- LCL and MCL complexes remain attached to the distal fragment
What construct is used for ORIF of a transolecranon fracture dislocation?
[JAAOS 2015;23:297-306]
Precontoured olecranon plate
What is the postoperative protocol following ORIF of a transolecranon fracture dislocation?
[JAAOS 2015;23:297-306]
- Splint 5-7 days
- Progressive AROM
- Strengthening at 6-8 weeks
What is the mechanism of a valgus posterolateral rotatory injury?
[JAAOS 2015;23:297-306]
Axial loading combined with valgus and supination at the elbow
What is the progression of injured structures in a valgus posterolateral rotatory injury?
[JAAOS 2015;23:297-306]
- Avulsion of LUCL from lateral epicondyle
- Radial head fracture and subluxation inferior to capitelum
- Tip of coronoid fracture as a result of subluxation of greater sigmoid notch relative to distal humerus
- MCL disruption
What is the immediate emergency department management of a posterolateral rotatory injury?
[JAAOS 2015;23:297-306]
- Procedural sedation
- Closed reduction
* Traction with elbow in extension to allow coronoid to clear distal humerus followed by flexion - Assess stability
- With the forearm in pronation bring the elbow back to extension to determine at which degree of flexion the elbow subluxates
- If >30o = elbow is unstable
- Assess the DRUJ to rule out Essex-Lopresti injury
- Splint the elbow in 90° flexion with forearm in pronation
- Postreduction xrays and CT scan
What are the indications for nonoperative management of a posterolateral rotatory injury?
[JAAOS 2015;23:297-306] [JAAOS 2009;17:137-151][Curr Rev Musculoskelet Med. 2016 Jun; 9(2): 185–189.]
- Small, minimally displaced radial head fracture with no mechanical block to supination/prontation
- Small coronoid tip fracture (Regan-Morrey type 1 or 2)
- Stable during postreduction testing
* Elbow should extend to 30° before becoming unstable - Concentric reduction of the ulnotrochlear and radiocapitellar joints
What is the general surgical management for posterolateral rotatory injury (terrible triad)?
[JAAOS 2015;23:297-306]
- Fixation of the coronoid
- Fixation or replacement of the radial head
- Repair of the LUCL complex
- Possible repair of the MCL
- External fixator if the elbow remains unstable
What approach is used for management of terrible triad injuries?
[JAAOS 2015;23:297-306]
- Lateral approach +/- medial approach
- Posterior incision with lateral +/- medial flaps
What are the intervals for lateral approach to the elbow?
[JAAOS 2015;23:297-306] [JAAOS 2009;17:137-151]
- EDC split
* Aim to be at the equator of the radial head, slightly anterior to the Kocher interval - Kocher interval
* Anconeus and ECU - If the common extensor origin is avulsed use the plane created by the injury
When using a lateral approach for a terrible triad, when is a supplemental medial approach necessary?
[JAAOS 2015;23:297-306]
- If residual instability is present after fixation of the coronoid, radial head and LUCL
- If the coronoid fracture was not adequately addressed from the lateral side
What intervals are used for the medial approaches to the elbow?
- Hotchkiss “over the top”
* Interval between FCU and palmaris longus - FCU split
- Floor of the cubital tunnel between the two heads of the FCU
- Insitu release of the ulnar nerve
- Split FCU in line with fibres to expose the sublime tubercle