What is the appropriate management for a complete medial patellofemoral ligament (MPFL) tear in an overweight adult female?

Management of Complete MPFL Tear in an Overweight Female

For a complete medial patellofemoral ligament (MPFL) tear in an overweight female, surgical reconstruction is the definitive treatment if she has recurrent instability or failed conservative management, while acute first-time tears may be managed conservatively with structured rehabilitation focusing on quadriceps strengthening and weight reduction.

Initial Assessment and Decision Framework

The management pathway depends critically on whether this is an acute first-time injury versus recurrent instability:

For Acute First-Time Complete Tears:

• Conservative management is appropriate if there are no associated intra-articular injuries (osteochondral defects, meniscal tears) and no immediate recurrent dislocation 1
• MRI is essential to classify the injury pattern and identify associated pathology 2
• Conservative treatment should include structured rehabilitation with knee-targeted exercise therapy, education, and weight management

For Recurrent Instability or Failed Conservative Treatment:

MPFL reconstruction is indicated and has demonstrated excellent long-term outcomes with:

• 84% return to sport rates
• <5% recurrence of instability
• <5% reoperation rates 3
• Sustained improvement at 10-year follow-up with median Kujala scores of 89 and Lysholm scores of 86 4

Critical Pre-Operative Evaluation

Before proceeding with surgery, you must assess for contraindications to isolated MPFL reconstruction:

Measure the tibial tubercle-trochlear groove (TT-TG) distance:

• If TT-TG >20mm, isolated MPFL reconstruction will fail—requires concurrent tibial tubercle osteotomy 3
• Studies show TT-TG may actually increase post-operatively (16.2mm to 20mm), so accurate preoperative measurement is critical 4

Assess trochlear dysplasia:

• Dejour type B, C, or D dysplasia may require trochleoplasty in addition to MPFL reconstruction 3
• Only normal or type A trochlear morphology is suitable for isolated MPFL reconstruction

Evaluate patellar height:

• Patella alta requires tibial tubercle distalization 3

Surgical Technique Considerations

Multiple reconstruction techniques show good outcomes 5, 4, 6:

Graft options:

• Semitendinosus allograft is commonly used 3
• Synthetic polyester suture tape with knotless anchors shows excellent 5-year outcomes with no recurrence and mean Kujala scores improving from 65.23 to 93.60 5
• Tibialis posterior allograft for complex cases 7

Key technical points:

• Femoral tunnel placement at Schottles' point (confirmed fluoroscopically) 3
• Patellar fixation at the superomedial half using suture anchors 1, 5, 6
• Consider stepwise medial imbrication to restore dynamic soft-tissue restraints 6

Special Considerations for Overweight Patients

Weight management is critical for both conservative and surgical outcomes:

• Increased BMI places higher mechanical stress on the reconstructed ligament
• Weight reduction should be integrated into the rehabilitation protocol
• Exercise therapy must be modified to accommodate weight-bearing limitations initially

Adjunctive procedures to consider:

• Lateral release if significant patellar tilt is present (>24° in extension)—this significantly reduces postoperative tilt and may prevent chondral damage 4
• Studies show association between increased preoperative patellar tilt and grade III/IV chondral lesions, particularly on the lateral patellar facet 4

Common Pitfalls to Avoid

1. Performing isolated MPFL reconstruction with TT-TG >20mm—this will fail
2. Inadequate assessment of trochlear dysplasia—high-grade dysplasia requires additional procedures
3. Over-tensioning the graft—leads to patellofemoral arthritis and pain
4. Ignoring associated chondral lesions—these worsen outcomes and may require concurrent treatment
5. Failing to address weight as a modifiable risk factor—compromises both surgical and conservative outcomes

Acute Repair vs. Reconstruction

For acute traumatic tears (within 2-3 weeks), primary repair may be considered 8:

• Open repair of MPFL to adductor tubercle with vastus medialis obliquus advancement showed 91.9 average Kujala score at 3-year follow-up
• No recurrent dislocations in 8 patients studied
• However, this older study (2000) has limited evidence compared to reconstruction techniques

Arthroscopic-assisted repair for acute patellar insertion tears is emerging as a minimally invasive option 1, though reconstruction remains the gold standard for chronic injuries 9.

Bottom Line Algorithm

1. Acute first-time tear + no intra-articular pathology → Conservative management with structured rehabilitation and weight reduction
2. Recurrent instability OR failed conservative treatment → Proceed to imaging assessment
3. TT-TG <20mm + normal/type A trochlea + normal patellar height → Isolated MPFL reconstruction
4. TT-TG >20mm OR high-grade dysplasia OR patella alta → MPFL reconstruction + appropriate bony procedure
5. Significant patellar tilt (>24°) → Consider adjunctive lateral release 4

The overweight status necessitates aggressive weight management as part of any treatment plan to optimize outcomes and reduce mechanical stress on the reconstruction 10.