Knee dislocations are a rare but serious cause of trauma. The aim of this study was to establish current demographics and injury patterns/associations in multi-ligament (MLI) knee injuries in the United Kingdom.

A National survey was sent out to trauma & orthopaedic trainees using the British Orthopaedic Trainees Association sources in 2018. Contributors were asked to retrospectively collect a data for a minimum of 5 cases of knee dislocation, or multi-ligament knee injury, between January 2014 and December 2016. Data was collected regarding injury patterns and surgical reconstructions.

73 cases were available for analysis across 11 acute care NHS Trusts. 77% were male. Mean age was 31.9 (SD 12.4; range 16–69). Mean Body Mass Index (BMI) was 28.3 (SD 7.0; range 19–52). Early (<3 weeks) reconstruction was performed in 53% with 9 (23%) patients under-going procedures for arthrofibrosis. Late (>12 weeks) reconstruction took place in 37% with one (3.7%) patient under-going arthroscopic arthrolysis. 4% had delayed surgery (3–12 weeks) and 5% had early intervention with delayed ACL reconstruction. For injuries involving 3 or more ligament injuries graft choices were ipsilateral hamstring (38%), bone-patella tendon-bone (20%), allograft (20%), contralateral hamstring (17%) and synthetic grafts in 18%.

Multi-ligament knee injuries are increasingly being managed early with definitive reconstructions. This is despite significant risk of arthrofibrosis with early surgery. Ipsilateral and contralateral hamstring grafts make up the bulk of graft choice however allograft (20%) and synthetic grafts (18%) remain popular.