Fig. 1From: Interrater reliability for unilateral and bilateral tests to measure the popliteal angle in children and youth with cerebral palsyTests to measure the popliteal angle. Unilateral test (a) and bilateral test (b). Reproduced with permission from ‘Orthopaedic Management in Cerebral Palsy’ by Eugene E. Bleck published by Mac Keith Press (www.mackeith.co.uk) in its Clinics in Developmental Medicine Series, 1987, 0–632–01523-3Back to article page