Fig. 1.

Derivation of cross-sectional analysis sample of 1058 knees. *Total knee replacements (TKRs) and uni-condylar knee replacements (UKR) knees excluded as AA alignment measurements unobtainable with a prosthesis in situ (n = 8 knees). ∼Excluded medical conditions: rheumatoid arthritis, lupus, psoriatic arthritis, polymyalgia rheumatica, gout, fibromyalgia, Paget's disease, polio, Parkinson's disease, multiple sclerosis, stroke, cerebral palsy or chronic inflammatory demyelinating neuropathy. ˆMissing clinical variables: age, body mass index, or presence of knee injury.