Subtalar joint axis location and rotational equilibrium theory of foot function.

A new theory of foot function based on the spatial location of the subtalar joint axis in relation to the weightbearing structures of the plantar foot is proposed. The theory relies on the concept of subtalar joint rotational equilibrium to explain how externally generated forces, such as ground reaction force, and internally generated forces, such as ligamentous and tendon tensile forces and joint compression forces, affect the mechanical behavior of the foot and lower extremity. The biomechanical effect of variations among individuals in the spatial location of the subtalar joint axis are explored, along with their clinical consequences, to offer an additional theory of foot function, which may improve on existing podiatric biomechanics theory.

[1]  M L Hull,et al.  The effect of lower-limb anatomy on knee loads during seated cycling. , 1992, Journal of biomechanics.

[2]  E. Koutsogiannis Treatment of mobile flat foot by displacement osteotomy of the calcaneus. , 1971, The Journal of bone and joint surgery. British volume.

[3]  E J van Langelaan,et al.  A kinematical analysis of the tarsal joints. An X-ray photogrammetric study. , 1983, Acta orthopaedica Scandinavica. Supplementum.

[4]  T. Hedman,et al.  Effect of Calcaneal Osteotomy and Plantar Fasciotomy on Arch Configuration in a Flatfoot Model , 1998, Foot & ankle international.

[5]  R. Blake,et al.  Foot orthosis for the severe flatfoot in sports. , 1991, Journal of the American Podiatric Medical Association.

[6]  A. M. Jacobs,et al.  Posterior calcaneal osteotomy. Effect, technique, and indications. , 1991, Clinics in podiatric medicine and surgery.

[7]  J. Manter Movements of the subtalar and transverse tarsal joints , 1941 .

[8]  V. T. Inman,et al.  Anthropometric studies of the human foot and ankle , 1969 .

[9]  A. Anderson,et al.  Anterior Calcaneal Osteotomy for Symptomatic Juvenile Pes Planus , 1984, Foot & ankle.

[10]  M. L. Root,et al.  Normal and abnormal function of the foot , 1977 .

[11]  N. Özkaya,et al.  Fundamentals of Biomechanics: Equilibrium, Motion, and Deformation , 1991 .

[12]  J. H. Hicks,et al.  The mechanics of the foot. I. The joints. , 1953, Journal of anatomy.

[13]  O. Svensson,et al.  The axes of rotation of the talocalcaneal and talonavicular joints , 1993 .

[14]  Lew C. Schon,et al.  Tendon Transfer Combined with Calcaneal Osteotomy for Treatment of Posterior Tibial Tendon Insufficiency: A Radiological Investigation , 1995, Foot & ankle international.

[15]  M. Myerson,et al.  Treatment of posterior tibial tendon dysfunction with flexor digitorum longus tendon transfer and calcaneal osteotomy. , 1996, Orthopedics.

[16]  R. Hecker,et al.  The Evans calcaneal osteotomy: postoperative care and an evaluation on the metatarsus adductus angle. , 1994, The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons.

[17]  A Toon Huson,et al.  Functional anatomy of the foot , 1991 .

[18]  C. Nester,et al.  Review of literature on the axis of rotation at the sub talar joint , 1998 .

[19]  Kirby Ka Methods for determination of positional variations in the subtalar joint axis. , 1987 .

[20]  K. Kirby Biomechanics of the normal and abnormal foot. , 2000, Journal of the American Podiatric Medical Association.

[21]  K. Kirby The medial heel skive technique. Improving pronation control in foot orthoses. , 1992, Journal of the American Podiatric Medical Association.

[22]  Shahan K. Sarrafian,et al.  Anatomy of the Foot and Ankle: Descriptive, Topographic, Functional , 1983 .

[23]  R. Blake Inverted functional orthosis. , 1986, Journal of the American Podiatric Medical Association.

[24]  T G McPoil,et al.  Three-dimensional movement of the foot during the stance phase of walking. , 1999, Journal of the American Podiatric Medical Association.

[25]  E. Fuller,et al.  Center of pressure and its theoretical relationship to foot pathology. , 1999, Journal of the American Podiatric Medical Association.

[26]  K. Kirby Methods for determination of positional variations in the subtalar joint axis. , 1987, Journal of the American Podiatric Medical Association.

[27]  Van Langelaan Ej A kinematical analysis of the tarsal joints. An X-ray photogrammetric study. , 1983 .

[28]  A. Catanzariti,et al.  Posterior calcaneal displacement osteotomy for adult acquired flatfoot. , 2000, The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons.

[29]  M I Root,et al.  Biomechanical examination of the foot. , 1973, Journal of the American Podiatry Association.

[30]  C. Payne The role of theory in understanding the midtarsal joint. , 2000, Journal of the American Podiatric Medical Association (Print).

[31]  R. Benink The constraint-mechanism of the human tarsus. A roentgenological experimental study. , 1985, Acta orthopaedica Scandinavica. Supplementum.

[32]  R. Blake,et al.  Update and rationale for the inverted functional foot orthosis. , 1994, Clinics in Podiatric Medicine and Surgery.

[33]  B. Sangeorzan,et al.  Effect of Calcaneal Lengthening on Relationships among the Hindfoot, Midfoot, and Forefoot* , 1993, Foot & ankle.

[34]  G. Phillips A review of elongation of os calcis for flat feet. , 1983, The Journal of bone and joint surgery. British volume.

[35]  K. Kirby Rotational equilibrium across the subtalar joint axis. , 1989, Journal of the American Podiatric Medical Association (Print).

[36]  J. P. Lord CORRECTION OF EXTREME FLATFOOT: VALUE OF OSTEOTOMY OF OS CALCIS AND INWARD DISPLACEMENT OF POSTERIOR FRAGMENT (GLEICH OPERATION) , 1923 .

[37]  Blake Rl Inverted functional orthosis. , 1986 .

[38]  Mahan Kt,et al.  Evans calcaneal osteotomy for flexible pes valgus deformity. A preliminary study. , 1987 .