Bordelon, Foot Ankle 1987 - Presidential Address, AOFAS: Foot First -- Evolution of Man

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Presidential Address, AOFAS: Foot First -- Evolution of Man

Bordelon·Foot Ankle·1987·4 citations·Commentary

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Bordelon's 1987 AOFAS presidential address synthesizes paleoanthropological and biomechanical evidence to argue that evolutionary redesign of the foot — not brain growth or tool use — was the primary catalyst for human development, and draws implications for how clinicians should think about foot function in the context of the entire lower extremity.

Key Findings

The human foot diverges from other primates in three structural features that together enable bipedal efficiency: longitudinal and transverse arches for weight transmission, rigid ligamentous support replacing grasping musculature, and a non-divergent hallux aligned parallel to the second metatarsal
The Laetoli footprints (~3.5 million years ago) are indistinguishable from modern human tracks — heel strike, strong arch, and inline great toe — proving fully upright bipedalism existed long before significant brain enlargement or tool use
The Olduvai foot fossil (~1.5 million years old) confirms the modern structural template: parallel first metatarsal, robust first and fifth rays, and complete arch architecture consistent with present-day weight transmission patterns
The foot's transition from supple (ground-conforming in loading) to rigid (push-off lever in late stance) is a passive mechanical event driven by bone geometry and ligament tension — not active muscle recruitment — meaning dysfunction here cannot be fully corrected by strengthening alone
Because foot posture sets the kinematic context for every joint above it, Bordelon argues that foot morphology warrants assessment in any lower-extremity or spinal complaint — deformity at the foot propagates proximally

Presidential Address, AOFAS: Foot First -- Evolution of Man.

BordelonFoot Ankle19874 citationsCommentary

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Presidential Address, AOFAS: Foot First -- Evolution of Man

Bordelon·Foot Ankle·1987·4 citations·Commentary

|

Bordelon's 1987 AOFAS presidential address synthesizes paleoanthropological and biomechanical evidence to argue that evolutionary redesign of the foot — not brain growth or tool use — was the primary catalyst for human development, and draws implications for how clinicians should think about foot function in the context of the entire lower extremity.

Key Findings

The human foot diverges from other primates in three structural features that together enable bipedal efficiency: longitudinal and transverse arches for weight transmission, rigid ligamentous support replacing grasping musculature, and a non-divergent hallux aligned parallel to the second metatarsal
The Laetoli footprints (~3.5 million years ago) are indistinguishable from modern human tracks — heel strike, strong arch, and inline great toe — proving fully upright bipedalism existed long before significant brain enlargement or tool use
The Olduvai foot fossil (~1.5 million years old) confirms the modern structural template: parallel first metatarsal, robust first and fifth rays, and complete arch architecture consistent with present-day weight transmission patterns
The foot's transition from supple (ground-conforming in loading) to rigid (push-off lever in late stance) is a passive mechanical event driven by bone geometry and ligament tension — not active muscle recruitment — meaning dysfunction here cannot be fully corrected by strengthening alone
Because foot posture sets the kinematic context for every joint above it, Bordelon argues that foot morphology warrants assessment in any lower-extremity or spinal complaint — deformity at the foot propagates proximally

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