Works in progress #2. Threaded acetabular components. Design rationale and preliminary clinical experience.

Two design rationales for threaded acetabular components, the S-ROM Anderson cup and S-ROM SuperCup, are discussed. Components have been followed for at least six months, with a range of six to 24 months. The average follow up is nine months. One hundred components in 96 patients had sufficient follow up and full clinical and roentgenographic evaluations to be included in this study. The 100 hips were divided into four groups based on S-ROM Anderson cup versus S-ROM SuperCup and on primary versus revision. Each hip was evaluated on a clinical and radiologic basis. Based on clinical and roentgenographic evaluations of both the primary and revision situations of the S-ROM SuperCup, consistently good to excellent results were observed. To date, no case has undergone revision for clinical or roentgenographic failure. Dramatic pain relief was exhibited by 96% of patients. Although early results are very encouraging, longer follow ups are necessary.