Periprosthetic Hip Fracture Rehabilitation: Vancouver B1 and B2 Fixation Protocols

Periprosthetic femoral fractures around a total hip arthroplasty (THA) or hemiarthroplasty represent devastating skeletal injuries in an aging population, carrying high one-year morbidity and mortality rates comparable to primary hip fractures. The gold-standard Vancouver classification categorizes these injuries by anatomical location and prosthetic stability: Type A (trochanteric avulsion), Type B (fracture around or just below the stem tip), and Type C (fracture well below the stem). The central clinical decision focuses on distinguishing Vancouver B1 (fracture around a well-fixed, stable stem) from Vancouver B2 (fracture around a loose stem) and B3 (loose stem with severely deficient bone stock). While B1 fractures are preserved and stabilized using locking compression plates with cerclage cables, B2 fractures require revision arthroplasty using a long-stem modular, fluted tapered femoral prosthesis that bypasses the fracture to achieve distal diaphyseal fixation. Physiotherapy must tailor weight-bearing and hip stability precautions strictly to the surgical reconstruction.

Domestic and Cultural Indian Realities

Managing a periprosthetic hip fracture in an Indian domestic household requires rigorous physical and structural adaptations. Traditional floor sitting (sukhasana) during meals or pooja prayers forces hip flexion well past 90 degrees and combined internal rotation, which can displace plate fixation or dislocate a revised hip prosthesis; floor sitting is permanently avoided, and high dining chairs and elevated wooden pooja chowkis must be used. Traditional Indian squat commodes pose catastrophic dislocation and implant failure risks; a raised western commode chair with armrests must be positioned directly over the squat pan. Sleeping on low, saggy rope charpoys forces the hips into perilous adduction; patients must sleep on a firm wooden cot elevated to 20 inches, using an abduction wedge pillow between the legs. Commuting via auto-rickshaws transmits harsh vertical shocks through the femoral stem; travel must be limited to cars with supportive seat cushions.

Clinical Biomechanics and Anatomical Healing

The femoral stem acts as a rigid intramedullary column. In Vancouver B1 fractures, the stem remains solidly bonded to the bone; open reduction and internal fixation utilizing a lateral locking plate with proximal cerclage cables and distal bicortical screws restores mechanical stability. In Vancouver B2 fractures, the cement mantle has fractured or the uncemented porous coating has debonded, leaving the stem loose within the canal. Simply plating a B2 fracture leads to rapid non-union, plate fatigue breakage, and stem subsidence. Revision with a long-stem fluted conical modular prosthesis bypasses the fracture zone by at least two cortical bone diameters (typically 4 to 6 centimeters), securing immediate distal rotational and axial stability. Flat-foot touch-down weight-bearing protects the bone-implant interface while preventing venous stasis.

Validated Special Tests and Differential Diagnosis

Clinical evaluation assesses leg length discrepancy, rotational hip stability, and active straight leg raise capability. Radiographic assessment is critical: true AP and lateral views are scrutinized for stem subsidence, cement mantle fracturing, radiolucent lines along the bone-prosthesis interface, and cortical calcar continuity. Differential diagnosis rules out periprosthetic joint infection (PJI) using serum inflammatory markers (ESR, CRP) and hip aspiration prior to surgical revision.

Stage-by-Stage Functional Recovery Protocol

Phase 1 (Weeks 0 to 6 post-op) enforces flat-foot touch-down weight-bearing (less than 10 kg) using a walking frame, strict posterior hip precautions (no flexion past 90 degrees, no adduction past midline, no internal rotation), and an abduction pillow during sleep. Patients perform isometric gluteal sets, active ankle pumps, and gentle active-assisted knee flexion in supine. Phase 2 (Weeks 6 to 12) progresses to partial weight-bearing (25% to 50%) with bilateral elbow crutches once serial radiographs verify bridging callus, incorporating standing hip abduction without resistance and seated knee extensions. Phase 3 (Weeks 12 to 24) advances to full unassisted weight-bearing, weaning to a single stick, and closed-chain functional balance drills.

Red Flags and Urgent Surgical Indicators

Seek immediate orthopaedic assessment if you notice sudden, severe hip pain accompanied by shortening of the leg and outward turning of the foot, which indicates hip dislocation or catastrophic stem subsidence. An inability to support any weight accompanied by a sensation of clicking in the thigh indicates plate breakage or screw pullout. Spreading redness, warmth, or purulent drainage from the lateral thigh incision signals deep surgical site infection.

Frequently Asked Questions