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Biomedical subjects

M J Shereff

Publications and source records attributed to M J Shereff.

42 records · Page 3Linked to original sources
PubMed1980

Complications of silastic implant arthroplasty in the hallux.

A long-term follow-up was evaluated on silastic implant arthroplasty performed on five patients (seven feet) for pathology of the metatarsophalangeal joint of the hallux. Four patients (five feet) displayed an inflammatory reaction in the immediate postoperative period with considerable swelling about the operative site. Subsequently, these patients developed either delayed wound healing of mild skin necrosis with secondary superficial infection. Three patients (five feet) ultimately developed implant failure via fracture of the prosthesis and/or erosion through the articulating surface of the prosthesis. All patients had late roentgenographic findings of resorption of bone around the implants. These complications necessitated removal of implants in three patients (five feet). Implant removal was recommended but refused in two patients (two feet).

Adult↗
PubMedDate not supplied

The effect of immobilization devices on the load distribution under the foot.

The load distribution under the foot was investigated under various conditions by means of pressure-sensitive transducers. Weight-bearing pressures at the first and third metatarsal heads and at the heel were measured while subjects ambulated barefoot and while wearing numerous immobilization devices. The proportion of body weight imposed on the plantar surface of the foot is dependent on the specific gait pattern displayed during barefoot walking. Maximum reduction of forefoot loads was achieved by means of a short-leg walking cast or an ankle boot cast with a posteriorly placed flat rubber heel. A centrally placed rocker heel leads to increased forefoot loads, especially under the first metatarsal head. Casting devices used in conjunction with cast shoes were not as effective in pressure reduction as the same cast with a posteriorly placed heel, but they were more effective than the rocker heel. The height of the cast and configuration of the sole of the cast shoe had little effect on the observed patterns of force distribution. The wooden-soled post-operative shoe did decrease weight-bearing pressures as compared with barefoot walking and casts with a rocker heel but was less effective than the other devices studied. Peak loads measured at the sole of the foot were dependent on the position of the ankle and subtalar joints at the time of cast application.

Adolescent↗
PubMedDate not supplied

Radiographic anatomy of the hindfoot.

Lead markers were placed on various osseous structures of the talus and calcaneus in fresh amputation specimens to analyze the radiographic anatomy of the hindfoot. Analysis of the talocalcaneal articulations revealed that only the central one-third of the posterior subtalar joint can be visualized on the lateral projection, whereas the axial view profiles only the anterior one-third of the joint. The anterior two-thirds of the middle subtalar joint is profiled on the lateral projection, whereas no portion of the middle articulation can be visualized on the axial view. The anterior subtalar joint can not be identified on either lateral or axial radiographs. In addition, nine extra-articular osseous landmarks on the talus and calcaneus were investigated. The identification of these structures is helpful in the diagnosis of pathologic disorders affecting the adult hindfoot.

Calcaneus↗