JBJS | Erratum: "Reliability and Intraoperative Validity of Preoperative Assessment of Standardized Plain Radiographs in Predicting Bone Loss at Revision Hip Surgery" (83-A: 1040-6, July 2001)

The Journal of Bone & Joint Surgery, Volume 83, Issue 11

Erratum | November 01, 2001

Erratum: "Reliability and Intraoperative Validity of Preoperative Assessment of Standardized Plain Radiographs in Predicting Bone Loss at Revision Hip Surgery" (83-A: 1040-6, July 2001)

Khaled J. Saleh, MD, MSc(Epid)

The Journal of Bone & Joint Surgery. 2001; 83:1712-1712

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Introduction

In "Reliability and Intraoperative Validity of Preoperative Assessment of Standardized Plain Radiographs in Predicting Bone Loss at Revision Hip Surgery" (83-A: 1040-6, July 2001), by Saleh et al., Table I contained an error. Type V should have been defined as: "Acetabular defect with contained or uncontained loss of bone stock in association with pelvic discontinuity. Any pelvic discontinuity is considered a type-V defect regardless of the amount of bone loss."Table I

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TABLE I: Scale for Assessment of Bone Loss in the Acetabulum

Type I	No notable loss of bone stock. Amount of bone loss is less than that which would require a revision component. There has been no migration of the primary component into the ilium, and both columns are largely intact.
Type II	Contained loss of bone stock. There is cavitary or volumetric enlargement of the acetabulum. If the cup does extend beyond the ilioischial line (protrusio), the defect can still be considered type II provided that the columns are intact.
Type III	Uncontained (segmental) loss of bone stock involving <50% of the acetabulum, primarily affecting either the anterior or the posterior column. Bone loss is considered uncontained if it is not amenable to treatment with morselized bone graft. The sum of all segments of bone loss in either the anterior or the posterior column allows 50% cup coverage by host bone (as assessed preoperatively with templates).
Type IV	Uncontained (segmental) loss of bone stock >50% of the acetabulum affecting both the anterior and the posterior column. Type IV is identical to type III except that the sum of the segmental bone loss in the columns exceeds 50%. There is no pelvic discontinuity.
Type V	Acetabular defect with contained or uncontained loss of bone stock in association with pelvic discontinuity. Any pelvic discontinuity is considered a type-V defect regardless of the amount of bone loss.

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TABLE I: Scale for Assessment of Bone Loss in the Acetabulum

Type I	No notable loss of bone stock. Amount of bone loss is less than that which would require a revision component. There has been no migration of the primary component into the ilium, and both columns are largely intact.
Type II	Contained loss of bone stock. There is cavitary or volumetric enlargement of the acetabulum. If the cup does extend beyond the ilioischial line (protrusio), the defect can still be considered type II provided that the columns are intact.
Type III	Uncontained (segmental) loss of bone stock involving <50% of the acetabulum, primarily affecting either the anterior or the posterior column. Bone loss is considered uncontained if it is not amenable to treatment with morselized bone graft. The sum of all segments of bone loss in either the anterior or the posterior column allows 50% cup coverage by host bone (as assessed preoperatively with templates).
Type IV	Uncontained (segmental) loss of bone stock >50% of the acetabulum affecting both the anterior and the posterior column. Type IV is identical to type III except that the sum of the segmental bone loss in the columns exceeds 50%. There is no pelvic discontinuity.
Type V	Acetabular defect with contained or uncontained loss of bone stock in association with pelvic discontinuity. Any pelvic discontinuity is considered a type-V defect regardless of the amount of bone loss.

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TABLE I: Scale for Assessment of Bone Loss in the Acetabulum

Type I	No notable loss of bone stock. Amount of bone loss is less than that which would require a revision component. There has been no migration of the primary component into the ilium, and both columns are largely intact.
Type II	Contained loss of bone stock. There is cavitary or volumetric enlargement of the acetabulum. If the cup does extend beyond the ilioischial line (protrusio), the defect can still be considered type II provided that the columns are intact.
Type III	Uncontained (segmental) loss of bone stock involving <50% of the acetabulum, primarily affecting either the anterior or the posterior column. Bone loss is considered uncontained if it is not amenable to treatment with morselized bone graft. The sum of all segments of bone loss in either the anterior or the posterior column allows 50% cup coverage by host bone (as assessed preoperatively with templates).
Type IV	Uncontained (segmental) loss of bone stock >50% of the acetabulum affecting both the anterior and the posterior column. Type IV is identical to type III except that the sum of the segmental bone loss in the columns exceeds 50%. There is no pelvic discontinuity.
Type V	Acetabular defect with contained or uncontained loss of bone stock in association with pelvic discontinuity. Any pelvic discontinuity is considered a type-V defect regardless of the amount of bone loss.

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TABLE I: Scale for Assessment of Bone Loss in the Acetabulum

Type I	No notable loss of bone stock. Amount of bone loss is less than that which would require a revision component. There has been no migration of the primary component into the ilium, and both columns are largely intact.
Type II	Contained loss of bone stock. There is cavitary or volumetric enlargement of the acetabulum. If the cup does extend beyond the ilioischial line (protrusio), the defect can still be considered type II provided that the columns are intact.
Type III	Uncontained (segmental) loss of bone stock involving <50% of the acetabulum, primarily affecting either the anterior or the posterior column. Bone loss is considered uncontained if it is not amenable to treatment with morselized bone graft. The sum of all segments of bone loss in either the anterior or the posterior column allows 50% cup coverage by host bone (as assessed preoperatively with templates).
Type IV	Uncontained (segmental) loss of bone stock >50% of the acetabulum affecting both the anterior and the posterior column. Type IV is identical to type III except that the sum of the segmental bone loss in the columns exceeds 50%. There is no pelvic discontinuity.
Type V	Acetabular defect with contained or uncontained loss of bone stock in association with pelvic discontinuity. Any pelvic discontinuity is considered a type-V defect regardless of the amount of bone loss.

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These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.

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Khaled J. Saleh; Erratum: "Reliability and Intraoperative Validity of Preoperative Assessment of Standardized Plain Radiographs in Predicting Bone Loss at Revision Hip Surgery" (83-A: 1040-6, July 2001). The Journal of Bone & Joint Surgery. 2001 Nov;83(11):1712-1712.

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