A 16-Year-Old Boy

and Iain McNamara1

Trauma & Orthopaedics, Norfolk & Norwich University Hospital, Norwich, United Kingdom



A 16-year-old boy sustained an acute first-time dislocation to his left patella when he was tackled from behind playing rugby, landing directly on the inside of his knee. The knee was immediately swollen. He went to hospital and was admitted, the patella having spontaneously reduced. He was treated conservatively with a free-moving hinged knee orthosis, discharged, and an MRI scan ordered and referred for advice on his further management.

He now presents 6 weeks later. He has remained on crutches. His knee is not painful and is no longer swollen. He has not regained full muscle power in his leg.

Past Medical History

Osgood-Schlatter disease

Family History


Current Medication





Beighton score

4 out of 9

Kujala score


Normal rotational profile to the lower limb.

No patellar apprehension. Patella tracked straight. Mediolateral glide ++ bilaterally with a firm end point. No localised tenderness including along the line of the MPFL.

Tibiofemoral joint normal including the ligaments.


Review of his images shows he has open physes. His MRI scan shows a lipohaemarthrosis, a hypoplastic lateral femoral condyle, and a bone bruise pattern consistent with an acute patellar dislocation.
Sep 26, 2017 | Posted by in ORTHOPEDIC | Comments Off on A 16-Year-Old Boy

Full access? Get Clinical Tree

Get Clinical Tree app for offline access