Hardy and Clapham's 1951 case-control study compared 89 symptomatic hallux valgus patients awaiting Keller's operation against 84 controls. Standardized weight-bearing radiographs, photography, goniometry, and footprints were used to identify features associated with deformity. The study asked which anatomic and historical factors actually track with hallux valgus severity.
This paper established the radiographic language still used to stage hallux valgus today. Before Hardy and Clapham, there was no controlled data linking specific angular measurements to deformity severity — clinical assessment was largely impressionistic.
When you measure an intermetatarsal angle on a weight-bearing AP foot film, you are using this paper's framework. An IMA above 13 degrees places a foot in morbid territory; a hallux valgus angle above 25 degrees crosses the 'critical angle' where deformity tends to be self-perpetuating and surgical thresholds become relevant.
Sesamoid position is your most sensitive single radiographic marker: a patient with grade 4 or greater lateral sesamoid displacement is almost certainly in the pathological range. Use it to confirm severity when the valgus angle alone is borderline.
Do not counsel patients that their job or activity level caused their bunion. The data show severe deformity clusters in patients who never wore high heels and whose mothers had the same condition. Heredity and anatomy outweigh footwear in the worst cases.
Hardy and Clapham's 1951 case-control study compared 89 symptomatic hallux valgus patients awaiting Keller's operation against 84 controls. Standardized weight-bearing radiographs, photography, goniometry, and footprints were used to identify features associated with deformity. The study asked which anatomic and historical factors actually track with hallux valgus severity.
This paper established the radiographic language still used to stage hallux valgus today. Before Hardy and Clapham, there was no controlled data linking specific angular measurements to deformity severity — clinical assessment was largely impressionistic.
When you measure an intermetatarsal angle on a weight-bearing AP foot film, you are using this paper's framework. An IMA above 13 degrees places a foot in morbid territory; a hallux valgus angle above 25 degrees crosses the 'critical angle' where deformity tends to be self-perpetuating and surgical thresholds become relevant.
Sesamoid position is your most sensitive single radiographic marker: a patient with grade 4 or greater lateral sesamoid displacement is almost certainly in the pathological range. Use it to confirm severity when the valgus angle alone is borderline.
Do not counsel patients that their job or activity level caused their bunion. The data show severe deformity clusters in patients who never wore high heels and whose mothers had the same condition. Heredity and anatomy outweigh footwear in the worst cases.